API marketplace

Parse and build URL query strings — with full support for nested objects and arrays. Turn a query string like a[b][c]=1&tags[]=x&tags[]=y into a clean nested JSON object, and turn any JSON object back into a properly-encoded query string. Choose how arrays are serialised (indices, brackets, repeated keys or comma-separated) and whether to URL-encode. Far beyond a flat key=value encoder — it handles the deep structures real web frameworks (Rails, PHP, Express/qs) use. Pure local processing — no key, no third-party service, instant. Live. 3 endpoints. Built for API request construction, parsing complex links and redirects, form-encoded bodies and webhook payloads.

Uptime

100.0%

Latency

88ms

Subs

4,286

Convert internationalized domain names (IDNs) between their human-readable Unicode form and the ASCII Punycode form (xn--…) that DNS actually uses. Encode a Unicode domain like münchen.de or 例え.jp (or even an emoji label like ☕.example) to ASCII, decode an xn-- domain back to Unicode, and convert a whole URL's host in either direction. Handles accents, non-Latin scripts and emoji. Useful for IDN domain handling, email and URL validation, DNS tooling, and spotting homograph / look-alike domains. Pure local IDNA conversion — no key, no third-party service, instant. Live. 4 endpoints. Distinct from Public-Suffix-List domain parsing and from generic text encoders.

Uptime

100.0%

Latency

78ms

Subs

3,697

Working-day date math. Count the business days between two dates, add or subtract a number of working days from a date (negative goes backwards), and check whether a given date is a business day — all skipping weekends and any holidays you supply. Configure which days count as the weekend (Saturday/Sunday by default, or e.g. Friday/Saturday) and pass a list of custom holiday dates to exclude. Perfect for SLA and support deadlines, delivery and lead-time estimates, payroll and invoicing periods, and financial settlement dates. Pure local UTC date math — no key, no third-party service, deterministic and instant. Live. 4 endpoints. Distinct from a calendar date toolkit (which counts calendar days) and a holidays directory (which lists holidays).

Uptime

100.0%

Latency

79ms

Subs

4,112

Detect the true type of a file from its content — its magic bytes / binary signature — not from its name. Send a file by URL or base64 and get back the real extension and MIME type, recognising 100+ binary formats: images (PNG, JPEG, GIF, WebP, AVIF, HEIC), audio and video (MP3, MP4, WAV, FLAC, MKV), archives (ZIP, GZIP, 7z, RAR, TAR), documents (PDF, DOCX, XLSX), fonts and more. Optionally pass a filename to flag a spoofed extension (e.g. a PNG renamed to .txt). Text formats like TXT, CSV, JSON and SVG have no signature and return detected=false. Detection is local — no key, no third-party service. Live, nothing stored. 2 endpoints. Built for secure upload validation, anti-spoofing checks, content pipelines and forensics. Distinct from an extension-to-MIME lookup.

Uptime

100.0%

Latency

80ms

Subs

4,540

Calculate the geometry of common shapes. Get the area of 2D shapes (circle, square, rectangle, triangle — by base/height or three sides via Heron, trapezoid, parallelogram, rhombus, ellipse, regular polygon), the perimeter or circumference, and for 3D shapes the volume and surface area (sphere, cube, box, cylinder, cone, square pyramid). Pass a shape and its dimensions and get back the exact result plus the formula used. Pure local math — no key, no third-party service, instant and deterministic. Live. 6 endpoints. Built for CAD and engineering tools, education and e-learning, construction and material estimation, and any app that needs reliable shape math. Distinct from a generic expression evaluator or unit converter.

Uptime

100.0%

Latency

71ms

Subs

4,937

Render templates with your data. Pass a Handlebars or Mustache template plus a JSON data object and get back the rendered text — ideal for dynamic emails, SMS and notifications, document and report generation, code scaffolding, and any "fill in the blanks" output. Handlebars supports blocks like {{#each}} and {{#if}} and is HTML-escaped by default (turn off with escape=false); Mustache is logic-less with sections and inverted sections. Both engines are safe — there is no arbitrary code execution. Pure local rendering — no key, no third-party service, instant. Live. 3 endpoints. Distinct from a Markdown renderer or a fake-data generator.

Uptime

100.0%

Latency

81ms

Subs

3,736

Format and beautify source code with Prettier, the de-facto code formatter. Pass code and a language and get it consistently re-formatted: JavaScript, JSX, TypeScript, TSX, CSS, SCSS, LESS, GraphQL and Vue. Tune the output with print width, tab width / tabs, semicolons, single vs double quotes and trailing-comma style. Syntax errors come back with a clear message. The inverse of a minifier. Pure local processing — no key, no third-party service, instant. Live. 3 endpoints. Built for code editors and playgrounds, paste-and-format tools, snippet beautification, docs and CI formatting checks. Complements the SQL formatter and the JSON/YAML/Markdown tools (which cover their own languages).

Uptime

100.0%

Latency

85ms

Subs

3,273

Shrink your web assets. Minify CSS, JavaScript and HTML through one simple API and get back the compact output plus how many bytes (and what percent) you saved. CSS is minified with clean-css, JavaScript with Terser (with optional name-mangling and compression toggles), and HTML with html-minifier-terser (collapsing whitespace, dropping comments and redundant attributes, and minifying inline CSS and JS). Pass the source as a parameter or in the request body (up to 5 MB). Pure local processing — no key, no third-party service, instant. Live. 4 endpoints. Built for build pipelines, on-the-fly asset optimisation, email-HTML slimming, CMS and CDN tooling, and page-speed work.

Uptime

100.0%

Latency

79ms

Subs

4,108

Generate realistic mock data from a JSON Schema. Send any JSON Schema and get back data that conforms to it — honouring types, formats (email, uuid, date-time, uri, ipv4 and more), minimum/maximum, string length and patterns, enums, required fields, and nested objects and arrays. Ask for a single object or an array of up to 100. Add a "faker" keyword on a property (e.g. "faker":"person.fullName" or "commerce.product") to get specific realistic values powered by Faker. Unlike fixed-entity fake-data generators, the shape is entirely driven by your schema — perfect for API mocking, test fixtures, database seeding, prototyping and contract testing. Pure local generation — no key, no third-party service, instant. Live. 2 endpoints. Distinct from JSON Schema validation and from canned mock-data entities.

Uptime

100.0%

Latency

79ms

Subs

4,862

Convert HTML into clean GitHub-Flavored Markdown. Pass an HTML string, or a live page URL to fetch and convert, and get back tidy Markdown — headings, bold/italic, links, images, lists, blockquotes, code blocks, plus GFM tables, strikethrough and task lists. Script, style and head elements are stripped automatically. Tune the output: ATX or setext headings, the bullet marker, fenced or indented code blocks, inline or referenced links, and the emphasis/strong delimiters; toggle GFM on or off. The inverse of a Markdown-to-HTML renderer. Pure local conversion (the optional URL fetch aside) — no key, no third-party service, instant. Live. 3 endpoints. Built for content migration, web clipping and "save as Markdown", scraping cleanup, CMS import and documentation pipelines.

Uptime

100.0%

Latency

88ms

Subs

3,619

Format, beautify and minify SQL across 15+ dialects. Pass a query and get it pretty-printed with consistent indentation and keyword casing — for PostgreSQL, MySQL, MariaDB, SQLite, SQL Server (T-SQL), Oracle (PL/SQL), BigQuery, Snowflake, Redshift, Spark, Trino, DuckDB, ClickHouse, DB2, Hive and standard SQL. Control the indent width and whether keywords are upper-cased, lower-cased or left as-is. A minify endpoint collapses a query to a single line (stripping comments while preserving string literals), and a dialects endpoint lists everything supported. Pure local processing — no key, no third-party service, instant. Live. 4 endpoints. Built for SQL editors and IDEs, query loggers, migration tooling, documentation and code review.

Uptime

100.0%

Latency

80ms

Subs

3,149

Convert and validate TOML — the config format behind Cargo.toml, pyproject.toml, Netlify and many tools. Turn TOML into JSON, turn JSON back into clean spec-compliant TOML 1.0, and validate any TOML with a precise error message (line and column) when it is malformed. Tables, arrays of tables, inline tables, typed values and datetimes are all handled. Input via the query string or the request body (up to 4 MB). Pure local processing — no key, no third-party service, instant. Live. 4 endpoints. Completes the oanor config-format family alongside the JSON, YAML, XML and CSV APIs — built for build tooling, config editors, CI and data pipelines.

Uptime

100.0%

Latency

78ms

Subs

4,792

Validate and work with product and publication codes. Check the check digit of any EAN-8, UPC-A, EAN-13, GTIN-14, ISBN-10, ISBN-13 or ISSN code — the type is detected automatically and you get back whether it is valid plus the expected check digit. Compute the missing check digit for a partial code, and validate or convert ISBNs between the 10- and 13-digit forms. Hyphens and spaces are ignored, so you can paste codes straight from a label or catalogue. Pure local computation — no key, no third-party service, instant. Live. 4 endpoints. Built for retail and inventory systems, e-commerce catalogues, publishing, library tooling and data validation. Distinct from barcode image generation, payment-card (Luhn) and IBAN checks.

Uptime

100.0%

Latency

84ms

Subs

4,540

See your colours the way colour-blind users do. Pass a hex colour (or a whole palette) and get back how it appears under each major colour-vision deficiency — protanopia (red-blind), deuteranopia (green-blind), tritanopia (blue-blind) and achromatopsia (total colour blindness) — as simulated hex and RGB values. Roughly 1 in 12 men and 1 in 200 women have some colour-vision deficiency, so this is ideal for accessibility testing of UI themes, charts, maps, status colours and branding: simulate your palette, spot colours that become indistinguishable, and fix them before you ship. Pure local matrix transforms — no key, no third-party service, instant. Live. 4 endpoints. Distinct from colour conversion and contrast tools.

Uptime

100.0%

Latency

80ms

Subs

4,704

Turn sequential integer IDs into short, unique, non-sequential strings — and back again. Encode one or more non-negative integers (or a hex string such as a Mongo ObjectId) into a compact YouTube-style id like "vbYCZIYD", then decode it to recover the exact original values. Add a salt so your ids are unique to your application, set a minimum length, or supply a custom alphabet. It is reversible obfuscation (not encryption): perfect for hiding row ids in public URLs, building short links, and avoiding leaking how many records you have. Pure local computation — no key, no third-party service, nothing stored. Stateless: decode with the same salt/min-length/alphabet you encoded with. Live. 5 endpoints. Distinct from UUID generation, base conversion and snowflake decoding.

Uptime

100.0%

Latency

73ms

Subs

4,914

Fingerprint images for near-duplicate detection and similarity. Compute the three classic perceptual hashes — aHash (average), dHash (difference) and pHash (DCT-based) — as 64-bit hex values for any image (by URL or base64), then compare two images to get the Hamming distance and a 0-100 similarity score per algorithm, with a likely-same flag. Unlike a cryptographic hash, perceptual hashes stay close when images are resized, recompressed or lightly edited — so you can spot duplicates, find re-uploads, cluster similar pictures and power reverse-image matching. Fully local (no third-party service), nothing stored. Supports PNG, JPEG, BMP, TIFF and GIF. Live. 3 endpoints. Distinct from basic image-info/resize and from string-similarity tools.

Uptime

100.0%

Latency

427ms

Subs

4,548

Parse a raw email (RFC 822 / MIME / .eml) into clean, structured data. Send the raw message (or a URL to a .eml file) and get back the sender, recipients (to / cc / bcc / reply-to) with names and addresses split out, the subject, the parsed date, the Message-ID, In-Reply-To and References (for threading), priority, the plain-text and HTML bodies, every header, and metadata for each attachment (filename, content type, size, content-id — never the binary payload). A /v1/headers endpoint returns just the header map. Parsing is fully local (no third-party service) and nothing is stored. Live. 3 endpoints. Built for inbound-email processing, .eml viewers, mailbox import, ticketing and email-automation pipelines. Distinct from address validation and SPF/DMARC checks.

Uptime

100.0%

Latency

81ms

Subs

4,715

Generate and parse vCard (.vcf) contact cards. Build a standards-compliant vCard 3.0 from simple fields — name (or first/last), organisation, job title, one or more phone numbers and emails, websites, a postal address, birthday, note and a photo URL — ready to download as a .vcf or embed in a contact QR code (pair it with the QR API for "scan to save contact"). Or go the other way: parse any vCard string back into clean structured fields. Pure local processing — no key, no third-party service, nothing stored. Live. 3 endpoints. Built for digital business cards, contact QR codes, address-book import/export, CRM integrations and email-signature tools.

Uptime

100.0%

Latency

78ms

Subs

3,680

Common money math as an API. Calculate a loan: its monthly payment, total interest and total cost — with an optional full amortization schedule and the effect of extra monthly payments. Break down a mortgage into PITI (principal & interest, property tax, insurance, PMI and HOA) from a purchase price and down payment. Project compound interest and savings growth with optional recurring contributions (future value, total contributions, interest earned). And compute ROI on an investment, with annualised return when you supply the holding period. Every calculation is exact, deterministic and instant — pure local math, no third-party service and nothing stored. Live. 5 endpoints. Built for loan and mortgage calculators, savings and retirement planners, fintech tools and budgeting apps. Distinct from market-data and bank-data services. No upstream key.

Uptime

100.0%

Latency

75ms

Subs

3,499

Extract the dominant colour palette from any image. Pass an image URL (we fetch it) or a base64 image and get back its main colours — each as a hex code, RGB triplet and the percentage of the image it covers — plus the single dominant colour and the overall average colour. Choose how many colours to return (1 to 16). The image is decoded and downscaled locally and the colours are quantised on the fly; nothing is stored and there is no third-party service. Supports PNG, JPEG, BMP, TIFF and GIF. Live. 2 endpoints. Built for theming and design tools, auto-generating UI colours from artwork or product photos, brand-colour extraction, and image tagging. Distinct from a single-colour converter or an image resize/info service. No upstream key.

Uptime

100.0%

Latency

85ms

Subs

4,845

Extract the hidden metadata baked into a photo. Pass an image URL (we fetch it) or a base64 image and get back its EXIF, GPS, IPTC and XMP data: the camera make and model, lens, software, the capture date/time, full exposure settings (shutter speed, aperture / f-number, ISO, focal length, flash, metering and white balance), orientation, colour space and resolution, plus the GPS location (latitude, longitude, altitude) with a ready Google Maps link — and the complete raw tag map. A dedicated /v1/gps endpoint returns just the geotag. Supports JPEG, TIFF, HEIC and PNG. Parsing runs locally (no third-party service) and nothing is stored. Live. 3 endpoints. Built for photo-management apps, geotagging, digital forensics, copyright/credit checks and image pipelines. Distinct from a basic image-info or resize service. No upstream key.

Uptime

100.0%

Latency

115ms

Subs

4,571

Convert geographic coordinates between every common format. Turn a latitude/longitude pair into a Plus Code (Open Location Code, as used by Google Maps), an MGRS reference (Military Grid Reference System), a UTM coordinate (zone, hemisphere, easting, northing) or a DMS string (degrees-minutes-seconds) — and convert any of those back to latitude/longitude. The /v1/all endpoint returns every format at once. Each conversion runs fully locally (no third-party service) so responses are instant and always available. Live, no cache. 6 endpoints. Built for GIS, mapping, surveying, logistics, aviation, emergency services and any app that exchanges coordinates between systems. Complements geohash and CRS lookups without overlap. No upstream key.

Uptime

100.0%

Latency

70ms

Subs

4,692

Read (decode) a QR code from an image — the inverse of a QR generator. Pass an image URL (we fetch it) or a base64 image (a data-URI or raw base64) and get back the decoded text or URL, the QR version and the corner coordinates of the code within the image. PNG, JPEG, BMP, TIFF and GIF are supported (up to 10 MB); large images are downscaled automatically so decoding stays fast. Decoding runs locally (no third-party scan service) and nothing is stored. Every call is live. 2 endpoints. Built for scanning uploaded QR codes, processing screenshots and documents, ticket and coupon validation, and back-end automation. No upstream key.

Uptime

100.0%

Latency

102ms

Subs

4,810

Detect and censor profanity in user-generated text across 24 languages — for comment moderation, chat filtering, username and form validation, and trust-and-safety pipelines. Send any text and get back whether it contains profanity, the exact bad words found and which languages they belong to; or get the text back with every bad word masked (choose your own mask character). Matching is word-boundary aware (so "Scunthorpe" and "Penistone" are not flagged) and normalises common leetspeak (sh1t, @ss) before matching. Target a specific language (or several) or scan all 24 at once. Powered by the well-known LDNOOBW word lists, bundled in — so the service is fully self-contained: no third-party calls, no rate limits, always available. Live, no cache. 4 endpoints. No upstream key.

Uptime

100.0%

Latency

69ms

Subs

3,531