● 188 APIs · one key · free plan

The small APIs you don’t want to build yourself

HTML to Markdown, link previews, JSON Schema validation, QR codes, IP geolocation, email validation, webhook testing, image & PDF metadata and 180+ more utilities. One API key, running on Cloudflare’s edge in 300+ cities.

Get your free API key →Try the tools

1,000 free requests every month. No credit card.

terminal

# Convert any web page to Markdown
curl "https://apibox.io.vn/v1/html-to-markdown?url=https://example.com" \
  -H "Authorization: Bearer abx_••••••••"

{
  "title": "Example Domain",
  "markdown": "This domain is for use in documentation…",
  "words": 25
}

# QR code straight into an <img>
<img src="https://apibox.io.vn/v1/qr?text=Hello&api_key=…">

All APIs

Every endpoint is independent, documented and comes with a free online tool.

Content & HTML

M↓

HTML to Markdown

Convert HTML or any web page URL into clean GitHub-flavored Markdown, with tables, optional article extraction and absolute links.

</>

Markdown to HTML

Render GitHub-flavored Markdown to HTML with tables and strikethrough. Output is sanitized by default to strip scripts and event handlers.

<✓>

HTML Sanitizer

Strip scripts, iframes, forms, event handlers, inline styles and javascript: links from untrusted HTML before you display it.

HTML to Text

Strip tags from HTML or a web page URL and get readable plain text with line breaks preserved, plus word and character counts.

RSS

RSS / Atom to JSON

Turn any RSS 2.0, RSS 1.0, Atom or JSON Feed into one clean JSON format, with feed discovery from a web page, images, authors and enclosures.

▦

HTML Tables to JSON

Extract every table of a web page or HTML snippet to JSON or CSV, with merged cells (rowspan / colspan) expanded and multi-row headers combined.

✉{}

Email CSS Inliner

Move <style> rules into style="" attributes for HTML e-mails, keep media queries, and warn about CSS that Gmail and Outlook do not support.

E-mail (.eml) parser

Parse a raw e-mail (.eml / MIME) into JSON: decoded subject and addresses, text and HTML, latest reply, attachments in base64, Received chain and DKIM.

Web & SEO

URL Metadata

Fetch any URL and get its title, description, Open Graph and Twitter Card tags, favicon, canonical, feeds and JSON-LD as JSON.

HTTP Headers

See the HTTP status and every response header of a URL, with a summary of security headers like HSTS, CSP and X-Frame-Options.

301

Redirect Checker

Follow every 301, 302, 307 and 308 redirect of a URL and get the full chain with status codes, the final URL and the number of hops.

BOT

robots.txt Parser

Fetch and parse the robots.txt of any site into user-agent groups, allow/disallow rules and sitemaps, and test if a path is crawlable.

WHO

WHOIS / RDAP Lookup

Look up a domain’s registrar, creation and expiry dates, days left, status codes, nameservers and DNSSEC as clean JSON from the registry’s RDAP service.

SEO

SEO Check

Audit the on-page SEO of a URL: title, description, headings, canonical, noindex, hreflang, Open Graph, alt text, structured data, robots.txt and sitemap, with a score.

XML

Sitemap Checker

Find and validate a website’s sitemaps (index, gzip): URL count, lastmod format, duplicates, other hosts, limits, and the HTTP status of a sample of URLs.

⛓

Broken Link Checker

Check every link and image of a web page: broken (404, 410, 5xx, no answer), redirected and bot-blocked links, with their anchor text and a score.

⊞xml

Sitemap Generator

Crawl a website from its home page and build sitemap.xml: same host only, robots.txt respected, noindex and canonical honoured, lastmod from headers.

✉

Form Backend

Point any HTML form at /f/{id}: submissions are stored, e-mailed to you and forwarded to a webhook, with spam honeypot, Turnstile and origin allow-list.

⚙

Website Technology Detector

Find out what a website runs on: CMS, e-commerce platform (Shopify, Haravan, Sapo…), JS framework, analytics, chat widgets, CDN and web server.

Data & JSON

{✓}

JSON Validator

Check JSON syntax with exact line and column of errors, and validate data against a JSON Schema (draft 4, 7, 2019-09 or 2020-12).

{ }

JSON Formatter

Pretty print JSON with 0-8 spaces or tabs, minify it, or sort object keys recursively. Syntax errors are reported with line and column.

CSV

CSV to JSON

Convert CSV into an array of JSON objects using the header row, with delimiter auto-detection, number and boolean typing, and row-level errors.

J→C

JSON to CSV

Convert a JSON array of objects or arrays into CSV with a header row and a custom delimiter, returned as JSON or as a downloadable text/csv file.

YML

YAML ⇄ JSON

Convert YAML to JSON or JSON to YAML in one endpoint, with multi-document support and syntax errors reported with line and column.

Vietnam Provinces & Wards

All 34 provinces and 3,321 phường / xã / đặc khu of Vietnam after the 07/2025 reorganisation, with codes, postal codes, search and old → new unit conversion.

₫

Gross ↔ Net Salary (Vietnam)

Convert Vietnamese gross and net salaries with social, health and unemployment insurance, family deductions and personal income tax, by period.

$⇄

Exchange Rates (VND)

Vietcombank buying (cash, transfer) and selling rates for 20 currencies, past dates, VND conversion and mid-market rates for 160 currencies.

30A

Vietnam Licence Plates

Read a Vietnamese licence plate: province before and after the 2025 merger, car or motorbike, special series (LD, KT, NG…) and plate colours.

📍

Vietnamese Address Parser

Split a free-text Vietnamese address into street, ward and province, and convert old 3-level addresses (with district) to the new 2-level units of 2025.

Loan & Instalment Calculator

Monthly repayment schedules for loans: declining balance, equal instalments or flat rate, promotional rates, early repayment fees and the real annual rate.

$..

JSONPath Query

Extract values from JSON with JSONPath (RFC 9535: wildcards, recursive descent, slices, filters with functions) or JSON Pointer, with the path of each result.

Δ{}

JSON Diff & Patch

Compare two JSON documents structurally and get a JSON Patch (RFC 6902) and Merge Patch (RFC 7386); apply patches to a document.

🏦

Savings & Deposit Calculator

Compute term-deposit interest as Vietnamese banks pay it: at maturity, monthly or upfront, with rollover of principal or principal + interest, and monthly savings plans.

|||#

Barcode Check (EAN / UPC / ISBN)

Validate product barcodes (EAN-8, EAN-13, UPC-A, GTIN-14, ISBN-10/13, ISSN), compute check digits and find the GS1 prefix organisation, e.g. 893 = GS1 Vietnam.

BIC

SWIFT / BIC Codes (Vietnam)

SWIFT / BIC codes of the banks operating in Vietnam (Vietnamese banks and foreign branches), search by name or code, and validation of any BIC.

VSIC

Vietnam Industry Codes (VSIC)

Search and browse Vietnam’s economic activity codes (VSIC 2025, Decision 36/2025/QĐ-TTg) used for business registration, with VSIC 2018 and the official 2018 ↔ 2025 conversion.

☁

Weather Forecast (Vietnam)

Weather forecast for the 34 provinces of Vietnam or any coordinates: current conditions, next 24 hours and up to 9 days, in Vietnamese and English.

CSV✓

CSV Cleaner

Repair CSV files: detect the encoding (UTF-8, UTF-16, Windows-1258/1252, TCVN3, VNI), the delimiter and header, trim cells, drop empty rows and duplicates, output UTF-8.

☀

Sunrise & Sunset Times

Sunrise, sunset, solar noon, day length, twilights, golden hour and moon phase for any Vietnamese province or coordinates, for up to 31 days.

吉

Vietnamese Good Days (Almanac)

Vietnamese almanac for any date: hoàng đạo / hắc đạo, 12 trực, 28 mansions, inauspicious days, clashing ages and lucky hours, scored per activity.

Vietnam HS Codes & Tariffs

Look up or search Vietnam’s 2026 HS codes (AHTN 2022) with MFN and preferential import duty, VAT, export duty, excise, FTA rates and policies.

kWh

Vietnam Electricity Bill

Compute an EVN electricity bill: the 5-tier household tariff from 1/11/2026, VAT, prorating across a price change, business rates and room splits.

HKD

Household Business Tax

VAT and personal income tax of a Vietnamese household business in 2026: 1-billion threshold, rates by sector, revenue vs income method, 30% reduction.

Social Insurance Benefits

Compute Vietnamese unemployment benefit, one-time social-insurance withdrawal with 2026 coefficients, severance, job-loss and maternity benefits.

LPT

Vietnam Registration Fee

Compute the Vietnamese registration fee for cars, motorbikes, houses and land by province, plus plate fee, road fee and insurance for the on-road price.

TAX

Vietnam Tax Calendar

Vietnamese tax deadlines for a year: VAT, PIT, provisional CIT, annual finalisation, moved past weekends and holidays, with extensions and ICS export.

HƯU

Vietnam Retirement Age

Retirement age and date in Vietnam from birth date and sex under the NĐ 135/2020 roadmap, the reduced-age case and the pension rate by years paid.

LTT

Vietnam Minimum Wage

Regional minimum wage in Vietnam (region I–IV, monthly and hourly) for any current ward, an old pre-2025 ward code or a province, for 2026 and 2027.

CCCD QR code reader

Parse the QR code of a Vietnamese chip ID card (CCCD / căn cước) from its text or a photo: ID number, name, birth date, sex, address, issue date, checks.

BHYT card code decoder

Decode a Vietnamese health insurance card code (mã thẻ BHYT): beneficiary group, benefit level and %, issuing province and social insurance number.

Vietnam Chart of Accounts

Look up Vietnamese accounting accounts under Circular 99/2025 (from 2026) or 133/2016, search by name, browse levels and map TT 200 accounts to TT 99.

Vietnam Traffic Fines

Search Vietnamese road traffic violations under Decree 168/2024 (as amended in 2026): fine range, licence points, extra penalties and exact article.

ZIP

Vietnam Postcodes

Find the 5-digit Vietnamese postcode of any new phường / xã (QĐ 2334/QĐ-BKHCN, 2025), list a province's codes, or check which ward a code belongs to.

Vietnam Form Catalogs

Official Vietnamese code lists for forms: 54 ethnic groups, religions, nationalities, VSCO 2020 occupations, education, marital status, blood groups.

ĐH

University Admission Score (VN)

Compute a Vietnamese university admission score under the 2026 rules: subject block total, KV / UT priority with the 22.5 reduction, bonus caps, IELTS.

Marketplace Seller Fees (VN)

Seller fees per order on Shopee, TikTok Shop and Lazada Vietnam: category fee, transaction fee, programmes, tax withheld, break-even and target price.

XML

XML ↔ JSON / TOML / INI

Convert XML to JSON and back, check XML well-formedness with line and column, pretty-print or minify XML, and convert TOML or INI to and from JSON.

🏳

Country data

ISO 3166 country codes, names in English, Vietnamese and native language, capital, calling codes, currencies, languages, flag emoji, TLD and time zones.

⌖

Coordinates to Ward (Vietnam)

Turn latitude / longitude into the current (post-07/2025) province and phường / xã of Vietnam with their codes; batch up to 1000 points, ward boundaries.

Vietnam VAT calculator

Add or split Vietnamese VAT per invoice line, check whether goods get the 8% rate until 31/12/2026 (NĐ 174/2025), and compute direct-method VAT.

Annual PIT finalisation

Annual personal income tax finalisation for salaries in Vietnam: tax for the year, refund or extra tax, 2026 deductions, deadlines and authorisation.

Vietnam corporate income tax

Corporate income tax in Vietnam under Luật 67/2025: 15/17/20% by revenue, 30% cut for 2026–2027, quarterly 80% check and late interest on the shortfall.

Foreign contractor tax

Vietnamese foreign contractor tax by activity: deemed VAT and CIT rates under the 2025–2026 rules, net-to-gross gross-up, withholding for Google, Meta…

Late payment interest

Late payment interest in Vietnam: tax 0.03% a day, social insurance, administrative fines and Civil Code interest, with partial payments and rate history.

Fixed-asset depreciation

Depreciation schedules under Vietnam’s TT 45/2013: straight line, declining balance (1.5/2/2.5), units of production, useful-life frames, CIT checks.

State-budget codes (chương, tiểu mục)

Look up chapter (chương) and sub-item (tiểu mục) codes for Vietnamese tax payment slips under TT 130/2025, with late-interest and abolished codes.

Overtime pay calculator

Overtime and night pay under Vietnam’s Labour Code: 150/200/300%, night +30% +20%, holiday work, monthly and yearly caps, PIT-exempt part from 2026.

Annual leave calculator

Annual leave days under Vietnam’s Labour Code: 12/14/16 days, +1 per 5 years, pro-rated months, and the payment for untaken leave when a contract ends.

Vietnam notary fee & transfer cost

Official notary fees (TT 257/2016) by contract type and value, plus the cost of a property transfer: 2% income tax, 0.5% registration fee, local fees.

ĐB

Vietnam vehicle fees

Recurring costs of a car or motorbike in Vietnam: road-use fee (NĐ 364/2025), compulsory insurance (NĐ 67/2023), inspection price, plus on-road cost.

Vietnam administrative fees

National fees of common Vietnamese procedures: passport, ID card, judicial record, driving licence, company registration, with cuts and VNeID waivers.

Vietnam sale calendar

E-commerce and marketing dates in Vietnam for any year: double days, payday, Tết, 8/3, 20/10, 20/11, Vu Lan, Black Friday, Online Friday, as JSON or ICS.

VN-2000 ↔ WGS84 converter

Convert Vietnamese VN-2000 x, y (sổ đỏ coordinates) to WGS84 lat / lon, UTM or back, with the province central meridian, parcel area and GeoJSON.

House building cost estimator

Estimate the converted construction area (diện tích xây dựng quy đổi) and the cost of building a house in Vietnam, with every coefficient editable.

House direction by birth year

Life palace (cung mệnh) by lunar birth year and sex, East / West group, the four good and four bad directions, a facing check and couple compatibility.

ĐT

School grade calculator (TT 22)

Subject averages, semester and year ratings Tốt / Khá / Đạt / Chưa đạt, promotion, re-tests and awards for grades 6–12 under Thông tư 22/2021/TT-BGDĐT.

Vietnam university major codes

Look up Vietnamese higher-education major codes (mã ngành) by code or name: TT 09/2022 bachelor, master, doctorate codes and their new TT 74/2026 codes.

+₫

Bank Notification Parser (Vietnam)

Parse balance-change SMS and app notifications of Vietnamese banks: amount +/−, balance, time, masked account, transfer content and your order code.

📦

Tracking Number Carrier Detector

Guess the carrier of a tracking number: GHN, GHTK, Viettel Post, VNPost, J&T, SPX, Ninja Van, plus UPS, FedEx, DHL, USPS with check digits.

Attendance timesheet

Turn time-clock exports into a timesheet: worked hours and units per day, late / early minutes, missing punches, OT by day type and night hours (22h-6h).

ICD

Vietnamese ICD-10 codes

Look up Vietnamese ICD-10 codes of Thông tư 06/2026/TT-BYT: Vietnamese names, chapter / block tree, main-diagnosis rules, accent-free search, batch checks.

{✓

JSON Repair

Repair broken JSON: missing quotes and commas, trailing commas, comments, Python / JS literals, truncated text, code fences. Lists what was fixed.

⚓

Container, AWB & UN/LOCODE

Check ISO 6346 container numbers and size-type codes, air waybill (AWB) check digits and airline prefixes, and search UN/LOCODE ports and airports.

⊕

Geo Tools (Distance, Geohash…)

Distance (haversine, Vincenty), bearing, destination, geohash, Google polyline, point in polygon, area, simplification and nearest points.

{·}

JSON Store

Store small JSON documents and read or update them over REST: merge patch, versions, optimistic locking, TTL and optional public read without a key.

Đg

Vietnam street names by ward

List and search the street names (đường, phố, ngõ, hẻm) of each new Vietnamese ward and province from OpenStreetMap, accent-insensitive.

Text

Text Diff

Compare two texts by lines, words, characters, sentences or JSON and get the changes, a similarity score and a unified diff patch.

a-b

Slugify

Turn titles into clean URL slugs: accents removed (Vietnamese đ included), custom separator, optional case keeping and maximum length.

123

Text Statistics

Count words, characters, sentences, paragraphs and lines, estimate reading and speaking time, and list the most frequent words of a text.

Case Converter

Convert text to lower, UPPER, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE or dot.case in one call.

Lorem Ipsum Generator

Generate random lorem ipsum placeholder text as paragraphs, sentences or words, returned as one string and as an array.

1→A

Number to Words

Spell numbers and money amounts in Vietnamese or English words for invoices and receipts: VND, USD, decimals, negatives, up to 21 digits.

Ăâ

Vietnamese Text Tools

Remove Vietnamese accents, convert TCVN3 (ABC) and VNI-Windows text to Unicode, Telex / VNI typing to letters, fix tone marks, split and sort names.

m↔ft

Unit Converter

Convert length, mass, area, volume, speed, data size, pressure, energy, power, time and temperature, including Vietnamese units (lượng, chỉ, sào, mẫu, công).

#@!

Vietnamese Profanity Filter

Detect and mask Vietnamese (and common English) profanity, insults and slurs, including unaccented spellings, teencode, l33t and separators like đ.ị.t.

từ

Vietnamese Word Segmentation

Split Vietnamese text into words (học sinh, thành phố, trí tuệ nhân tạo) instead of syllables, recognise names and places, and extract keywords.

Aあ

Language Detection

Detect the language of a text among 80+ languages with a confidence score, scripts and candidates, including Vietnamese written without accents.

≡→

Text Summarizer

Summarise Vietnamese or English articles by picking their most important sentences (TextRank), with keywords and scores; fast, deterministic and without AI costs.

Ả✓

Vietnamese Spell Checker

Check Vietnamese spelling: invalid syllables, c/k, g/gh, ng/ngh rules, frequent mistakes (xử dụng, sử lý, nghành) and punctuation, with suggestions.

a→ă

Vietnamese Accent Restoration

Restore Vietnamese diacritics in text typed without accents (“xin chao cac ban” → “xin chào các bạn”) using a dictionary and syllable frequencies.

2tr

Vietnamese amounts to numbers

Turn Vietnamese written or colloquial amounts into numbers: “hai triệu rưỡi”, “2tr5”, “500k”, “1 tỷ 2”, “2 củ”; batch mode and amount extraction from text.

Họ

Vietnamese name parser

Split a Vietnamese full name into family, middle and given names, fix capitals, guess gender with a probability, suggest anh / chị and e-mail slugs.

Vietnamese date parser

Turn Vietnamese date and time expressions into ISO: “thứ 2 tuần sau”, “8h tối nay”, “cuối tháng này”, “mùng 5 Tết”, “15/8 âm lịch”, in Vietnam time.

SMS

SMS segment counter

Count SMS segments (GSM-7 160/153 or UCS-2 70/67), list the characters that force Unicode, get an unaccented GSM-safe version and check a brandname.

🛒

Order Extractor (chat / comments)

Turn a chat or livestream comment ("chốt 2 áo đen size M, ship 12 Lê Lợi…, 0909…") into an order: phone, name, address, items, payment, notes.

ko→

Teencode Normaliser

Normalise Vietnamese teencode and chat abbreviations (ko, dc, j, z, ntn, iu…), repeated letters and leftover Telex, keeping case. Changes listed.

⚠QC

Ad Wording Checker (Vietnam)

Flag risky wording in Vietnamese ads, listings and livestream scripts: "tốt nhất", "số 1", cure claims, comparisons, off-platform contact, with legal refs.

A→Ư

Vietnamese Sort & Collation

Sort Vietnamese lists in dictionary order (a ă â, d đ, tones), compare strings, make DB sort keys, group by letter, sort names by given name.

漢

Hán-Việt Reader

Convert Chinese text to Hán-Việt (Sino-Vietnamese) readings and pinyin by word, with traditional / simplified forms; or find characters by reading.

≈

Fuzzy Match & Dedupe

Compare strings (Levenshtein, Jaro-Winkler, token set, trigram), find the best matches in a list and cluster duplicates, with Vietnamese accent folding.

Images & Codes

QR Code Generator

Generate QR codes as PNG or SVG with one GET request: URLs, text, WiFi logins, vCards, e-mail, SMS, phone and geo links. Custom colours, size and ECC.

|||

Barcode Generator

Create Code 128 barcodes for labels, SKUs and shipping with a single request. SVG with human-readable text or PNG, custom height, width and colours.

▭

Placeholder Image

Get placeholder images of any size for mockups and tests: /v1/placeholder/600x400.png. SVG with custom text and colours, or a solid-colour PNG.

VQR

VietQR Generator

Create VietQR / NAPAS 247 bank transfer QR codes with bank, account, amount and transfer note as PNG, SVG or JSON payload. Decode existing VietQR codes.

Avatar Generator

Default profile pictures from a name: initials avatars that read Vietnamese names correctly (Nguyễn Văn An → NA) or identicons, with a stable colour per user.

⌖

QR Code Reader

Read the QR code in a PNG or JPEG image; VietQR payment codes are decoded into bank, account number, amount and transfer note.

OG▣

Social Image Generator

Generate Open Graph / Twitter preview images (1200×630 PNG or JPEG) from a title, subtitle and site name, with correct Vietnamese typography and themes.

⤡

Image Resize & Convert

Resize, crop, rotate, flip and convert images between PNG and JPEG with high-quality resampling and adjustable JPEG quality to shrink file size.

▥

Chart Image

Render bar, line, area, pie, doughnut, scatter and sparkline charts from a Chart.js-like JSON config as PNG or SVG, by a URL usable in <img> and emails.

|||

Barcode Reader

Read every 1D / 2D barcode in a PNG or JPEG: EAN-13 / 8, UPC, Code 128 / 39 / 93, ITF, QR, DataMatrix, PDF417, Aztec, with position and GS1 country.

SVG

SVG optimise, sanitise & render

Optimize SVG with svgo, strip scripts and external references from untrusted SVG, inspect it, or render it to PNG / JPEG at any size, without a browser.

🎨

Image palette & BlurHash

Get the dominant colours of a PNG, JPEG or SVG with their share, the average colour, readable text colours, and BlurHash / ThumbHash placeholders.

★

Favicon generator

Turn a PNG, JPEG or SVG logo, or a letter, into a full favicon set: favicon.ico, PNG and maskable icons, apple-touch-icon, site.webmanifest and HTML.

∑

LaTeX math renderer

Render LaTeX formulas (fractions, roots, sums, integrals, matrices, \ce chemistry) to SVG, PNG or MathML for web pages, e-mails, PDFs and quizzes.

</>

Code screenshot (Carbon style)

Turn source code into a beautiful image like carbon.now.sh: syntax highlighting for 29 languages, 9 themes, window, line numbers, highlighted lines.

Files

EXIF

Image Metadata & EXIF

Read image dimensions, format, EXIF camera data, capture settings and GPS location from JPEG, PNG, WebP, HEIC, AVIF, GIF and more – upload or URL.

PDF

PDF Metadata

Read PDF metadata: page count, title, author, creator, producer, dates, PDF version, encryption, form fields and the size of each page (A4, Letter…).

PDF₫

Quote & Receipt PDF

Generate clean PDF quotations, receipts, orders and simple invoices from JSON, with Vietnamese text, VAT, totals in words and a VietQR code for payment.

M↓PDF

Markdown to PDF

Convert Markdown to a clean A4 / A5 / Letter PDF: headings, bold / italic, links, nested lists, quotes, code blocks, tables, page numbers, full Vietnamese support.

XLS

Excel ↔ JSON / CSV

Read an .xlsx workbook into JSON rows or CSV (dates as ISO, header row as keys), or build a styled .xlsx file with several sheets from JSON.

DOC

Word to Markdown / HTML

Convert a Word .docx file to Markdown, clean HTML or plain text, keeping headings, bold / italic, links, numbered and nested lists and tables.

PDF

PDF Tools

Merge PDFs, extract or split pages, rotate pages, stamp a diagonal watermark or add page numbers (Vietnamese text supported), all in one API.

PDF→T

PDF to Text

Extract the text layer of a PDF page by page (Vietnamese Unicode kept), with document metadata, word counts and a warning for scanned files.

HĐ

Vietnam e-invoice XML reader

Turn a Vietnamese e-invoice XML (QĐ 1450/QĐ-TCT) into clean JSON or CSV: seller, buyer, lines, VAT groups, totals, with arithmetic and symbol checks.

MIME

File type detector

Detect the real type of a file from its bytes (130+ formats), compare it with the name and Content-Type, and flag disguised executables and macros.

Bank Statement Normaliser (Vietnam)

Read XLSX / CSV statement exports of Vietnamese banks into one schema, check the running balance and reconcile credits with expected payments.

Vietnamese quiz parser

Read a Vietnamese multiple-choice exam from Word or text ("Câu 1. … A. … B. …") with its answers and export JSON, GIFT, Aiken, Moodle XML or Quizizz CSV.

MĐ

Exam version mixer

Shuffle questions and options into N exam versions with codes (mã đề) and answer keys, reproducible from a seed. JSON or a zip of .docx exams.

{W}

Word template filler

Fill a Word .docx template with {placeholders}, table-row loops and conditions from JSON; merge many rows into a zip of documents. Formats VND and dates.

PDF form filler

List the fields of a fillable PDF, fill them from JSON with full Vietnamese text, flatten the result and batch-fill many forms into a zip.

Network & Validation

IP Geolocation

Look up the country, region, city, coordinates, ASN and ISP of any IPv4 or IPv6 address – or your own IP – in one fast JSON call.

DNS

DNS Lookup

Query A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV and more for any domain, or reverse-lookup an IP (PTR), via DNS over HTTPS. Clean JSON output.

Email Validator

Validate e-mail addresses: syntax, MX/A records, ~120k disposable domains, role accounts, free providers and typo hints like gmial.com → gmail.com.

☎

Phone Number Validator

Validate and format phone numbers for 240+ countries: E.164, international and national formats, country, calling code and line type (mobile, fixed line…).

CCCD & Tax Code Validator

Validate Vietnamese citizen ID (CCCD), old ID (CMND) and tax code (MST) numbers: structure, province, gender, birth year and tax code check digit.

SPF

Email Authentication Check

Audit a domain’s email setup: MX, SPF (with the 10-lookup limit), DKIM keys, DMARC policy, MTA-STS, TLS-RPT and BIMI, with a score and what to fix.

.vn

Domain Parser (Public Suffix)

Split a URL, e-mail or hostname into subdomain, registrable domain and public suffix (.com.vn, github.io) from the Public Suffix List; IDN, batch of 1000.

/24

CIDR / Subnet Calculator

IPv4 / IPv6 subnet calculator: network, broadcast, netmask, host range and count; check if IPs are inside, split subnets, merge lists, range to CIDR.

MAC

MAC Address Vendor Lookup

Find the manufacturer of a MAC address from the IEEE registries (MA-L, MA-M, MA-S), flag random / locally administered MACs, convert formats; batch.

SSL

SSL Certificate Checker

Check the SSL/TLS certificate of any domain: days to expiry, issuer, SANs, hostname match, chain, OCSP stapling, TLS version, cipher and old protocols.

Security & Crypto

Hash Generator

Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 of text or files in one call, as hex or base64, with optional HMAC signing.

B64

Encode / Decode

Encode or decode text as Base64, Base64URL, hex, URL encoding, HTML entities, Unicode escapes, ROT13 or binary with one simple API call.

***

Password Generator

Generate cryptographically secure random passwords (4–256 chars, up to 100 at once) or check a password’s strength, entropy and estimated crack time.

JWT

JWT Decode & Sign

Decode any JWT, check expiry and verify its signature with a secret, PEM or JWK – or sign new tokens with HS256/384/512, RS, PS or ES algorithms.

2FA

TOTP / 2FA Codes

Add two-factor authentication: create TOTP secrets with an otpauth:// QR code for Google Authenticator, compute and verify 6–8 digit codes (RFC 6238 / HOTP).

HSTS

Security Headers Check

Grade a website’s HTTP security from A+ to F: HTTPS redirect, HSTS (preload), Content-Security-Policy, framing, cookies, CORS, mixed content and version leaks.

🔑

Password Strength & Breach Check

Score a password 0–4 with crack-time estimates and advice, and check whether it appears in known data breaches without ever sending it (k-anonymity).

💳

Card Number Validator

Validate payment card numbers: Luhn checksum, length, brand (Visa, Mastercard, JCB, Amex, UnionPay, NAPAS…), Vietnamese NAPAS issuing bank and a masked form.

U+

Unicode & Homoglyph Check

Inspect text character by character (code points, scripts, invisible and bidi characters) and detect look-alike domains such as аpple.com written with Cyrillic letters.

HMAC

Webhook Signature Verifier

Check webhook signatures of Stripe, GitHub, Slack, Shopify, PayOS and SePay, or any HMAC: see the expected signature, the signed content and replay windows.

✍

PDF Signature Verifier

Check every digital signature in a PDF: integrity, edits after signing, signer (MST / CCCD), signing time, timestamp and chain to Vietnam's Root CA.

██

PII Redaction (Vietnam)

Find and mask personal data in Vietnamese text: CCCD, tax codes, phones, bank accounts, cards, emails, BHYT, plates, names, addresses. Spans reported.

IP?

IP Intelligence (Cloud, Tor, Bots)

Is an IP from AWS, Google Cloud, Azure, Cloudflare and other hosts, a Tor exit node or a verified Googlebot / Bingbot? From official range files, daily.

PEM

X.509 Certificate & CSR Tool

Decode PEM or DER certificates, CSRs, keys, PKCS#7 and CRLs, check that a key matches its certificate, convert PEM↔DER, generate keys and CSRs.

Developer utilities

UUID Generator

Generate up to 1,000 UUID v4, time-ordered UUID v7, ULID, Nano ID or random hex IDs per request. Secure randomness, optional uppercase.

⏱

Cron Expression Parser

Validate a cron expression and get its next run times in any timezone, with a plain-English description. Supports 5, 6 and 7-field cron syntax.

🕒

Time & Timezone Converter

Get the current time in any timezone, convert between timezones and Unix timestamps (seconds or ms), with UTC offset and weekday for up to 30 zones.

🎨

Color Converter

Convert colours between HEX, RGB, HSL and CMYK, check WCAG contrast ratios and get complementary, triadic, analogous colours and shades in one call.

User Agent Parser

Parse any User-Agent string into browser, engine, OS, device type, vendor and model, and detect bots and crawlers. No UA given? It parses your own.

☾

Vietnamese Lunar Calendar

Convert solar ⇄ Vietnamese lunar dates (âm lịch) with leap months, Can Chi, zodiac, solar terms, lucky hours and lunar holidays such as Tết. Years 1800–2199.

📅

Vietnam Holidays & Working Days

Vietnamese public holidays per year (official schedules and the Labour Code rules), working-day checks, counts and “N working days later”.

Regex Tester

Run a JavaScript regular expression on text: all matches with positions, numbered and named groups, replace and split, with protection against runaway patterns.

ICS

iCalendar (.ics) Generator

Create .ics calendar files for Google, Apple and Outlook: events, all-day events, recurrence, reminders, and yearly events on a lunar date (giỗ, rằm) expanded to solar dates.

☯

Vietnamese Zodiac & Age

From a birth date: lunar year (from Tết), can chi, zodiac animal, nạp âm element (mệnh), cung phi, lunar age, lucky colours and compatible signs.

1.2.3

Semver

Parse and validate semantic versions, compare them, check npm-style ranges (^, ~, x, ||), sort lists and compute the next major / minor / patch / pre-release.

Number Base & Roman Converter

Convert integers of any size between bases 2–36 (binary, octal, decimal, hex, base36) and Roman numerals, with grouped binary and hex output.

SQL

SQL Formatter

Pretty-print SQL queries with consistent indentation and keyword case for MySQL, PostgreSQL, SQL Server, Oracle, BigQuery and more, or compact them.

{…}

JS / CSS / HTML Minifier

Minify JavaScript (Terser), CSS (CSSO), HTML and JSON, with the byte and gzip size before and after; the language is detected automatically.

{T}

JSON to types

Generate TypeScript interfaces, Zod schemas, JSON Schema 2020-12, Go structs, Python dataclasses or Pydantic models from one or more JSON samples.

∑

Math expression evaluator

Evaluate math expressions safely: units (5 cm to inch), matrices, statistics, variables, big numbers or exact fractions, with formatted result and LaTeX.

🌐

World public holidays

Public, bank and observance holidays of ~200 countries and their states, next holidays, is-it-a-holiday checks and business days between dates.

Provably fair random draw

Pick giveaway winners from a list or a number range with a commit-reveal proof: publish the seed hash first, draw with a public salt, let anyone verify.

OpenAPI Validator & Converter

Validate OpenAPI 3.0, 3.1, 3.2 and Swagger 2.0 against the official schemas, lint common mistakes, list endpoints, YAML ↔ JSON, upgrade Swagger 2 to OAS 3.

Testing

⇄

Webhook Tester

Create a unique URL that captures every HTTP request sent to it – method, headers, query and body – then inspect them in the browser or via API.

👤

Vietnamese Fake Data

Realistic Vietnamese test data: names, addresses on the 2025 map, mobile numbers by network, CCCD and tax codes with a valid structure, companies, bank accounts.

{?}

JSON Schema Mock Data

Generate realistic sample JSON from a JSON Schema (types, formats, enums, patterns, ranges, $ref, oneOf / allOf), validated against the schema.

◧

Image Diff

Compare two images pixel by pixel (perceptual colour distance, anti-aliasing aware) and get the share of changed pixels, the changed area and a highlighted diff image.

◉

Uptime Monitors

Create uptime monitors that check a URL every 5–1440 minutes and alert you by e-mail or webhook when it goes down and when it is back up.

Why APIBox

Fast, everywhere

Runs on Cloudflare Workers close to your users. Most calls answer in a few milliseconds.

One key, every API

Stop signing up for ten services. One key, one quota, one invoice.

Simple REST + JSON

GET or POST, JSON in, JSON out. Works with curl, fetch, Python, PHP, Go, no SDK needed.

Fair pricing

Free 1,000 requests/month. $5 for 50,000. $15 for 500,000. Pay by bank transfer (VietQR) or PayPal.

Privacy first

Content you send is processed in memory and never stored (except the webhook tester, which you control).

Free online tools

Every API has a free browser tool, handy to test before you integrate.

Simple pricing

Start free, upgrade when you grow. Prepaid, no automatic renewal.

Free

$0/month

1,000 requests / month
30 requests / minute
All 188 APIs
2 API keys
2 webhook bins
3 uptime monitors
2 form endpoints
10 JSON documents
5 MB max file size

Start free

Starter

$5/month

50,000 requests / month
300 requests / minute
All 188 APIs
10 API keys
10 webhook bins
20 uptime monitors
20 form endpoints
100 JSON documents
20 MB max file size

Choose

Pro

$15/month

500,000 requests / month
1,200 requests / minute
All 188 APIs
50 API keys
50 webhook bins
100 uptime monitors
100 form endpoints
1,000 JSON documents
50 MB max file size

Choose

Frequently asked questions

What is APIBox?

APIBox is a collection of small, reliable REST APIs for common developer chores: converting HTML to Markdown, reading link metadata, validating JSON and e-mails, generating QR codes, looking up IPs, capturing webhooks and more, all with a single API key.

Is there a free plan?

Yes. The Free plan includes 1,000 requests per month across all APIs, forever, with no credit card.

How do I authenticate?

Send your key in the Authorization header: "Authorization: Bearer abx_..." (or X-API-Key). For image URLs such as QR codes you can also pass ?api_key=.

What happens when I reach my quota?

Requests answer HTTP 429 with the code quota_exceeded until the first day of the next month (UTC), or until you upgrade. Response headers X-Quota-Limit and X-Quota-Remaining show where you are.

How can I pay?

Vietnamese customers pay by bank transfer with a VietQR code (confirmed automatically by SePay within a minute). International customers pay with PayPal or a card through PayPal. Plans are prepaid for 1, 3, 6 or 12 months (12 months for the price of 10).

Do you store my data?

No. Request bodies are processed in memory and discarded. Only counters (how many requests per endpoint per day) are kept for your usage statistics. Webhook tester requests are kept in your bins until you delete them or they expire.

Ship faster today

Create an account in 30 seconds and get 1,000 free requests every month.

Get your free API key →