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File Conversion APIs

Format conversion here is mostly free, keyless and narrow: YAMLine turns YAML into JSON, SQLable converts CSV to JSON Lines, and CodeCogs renders LaTeX equations as PNG, SVG or PDF from a URL. Nerdulator identifies and converts numbers, dates, colors and cron expressions. Utilorax is the broad option, with calculator, hashing, text and PDF endpoints behind an API key.
8 listings of 69 in catalogue
TableRows
APIPricingAuthFormatFree tierStatus
CodeCogs Equation EditorRenders LaTeX equations as PNG, SVG, GIF, EMF, or PDF images from a plain URL.
Utilities › File Conversion
FreemiumNoneBinary1k–10k/dayLive
DigiDatesSmall date/time utility API: unix timestamps, leap years, age, countdowns, German public holidays.
Utilities › File Conversion
FreeNoneJSONUnlimitedLive
FluentEDIDeterministic utility tools for agents: X12 EDI parsing, time math, JSON repair, DNS/WHOIS lookups.
Utilities › File Conversion
FreeNoneJSONUnlimitedLive
JSON 2 JSONPWraps any JSON URL in a JSONP callback for legacy cross-domain requests, no key needed.
Utilities › File Conversion
FreeNoneJSONUnlimitedLive
NerdulatorDeterministically identifies and converts any input (numbers, dates, colours, UUIDs, cron expressions).
Utilities › File Conversion
FreeNoneJSON10k+/dayLive
SQLableConverts CSV data to JSON Lines (JSONL) with automatic number detection, via a single POST endpoint.
Utilities › File Conversion
FreeNoneJSONUnlimitedUntested
Utilorax200+ calculator, converter, hashing, text and file endpoints (BMI, unit conversion, hashes, PDFs).
Utilities › File Conversion
FreemiumAPI keyJSON<100/dayLive
YAMLineConverts YAML documents to equivalent JSON via a single POST endpoint, no key required.
Utilities › File Conversion
FreeNoneJSONUnlimitedUntested

Choosing a File Conversion API

Is there a free File Conversion API?

Yes. YAMLine, DigiDates, FluentEDI, JSON 2 JSONP, Nerdulator and 1 other are free to use, and CodeCogs Equation Editor and Utilorax have a free tier alongside paid plans.

Which File Conversion APIs work without an API key?

CodeCogs Equation Editor, YAMLine, DigiDates, FluentEDI, JSON 2 JSONP and 2 others need no key or sign-up, so you can try them with a plain request.

Can I call a File Conversion API from front-end JavaScript?

CodeCogs Equation Editor, DigiDates, FluentEDI, JSON 2 JSONP and Nerdulator allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.

Can I use File Conversion APIs in a commercial project?

FluentEDI permits commercial use. CodeCogs Equation Editor and Utilorax restrict it, for example to non-commercial or attributed use, so read the terms first.

Which File Conversion APIs work with AI agents?

FluentEDI has both an MCP server and an OpenAPI spec. Nerdulator publishes an OpenAPI spec for generating clients and tools.

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Related: PDF & Documents APIs