usefulweb.site FileFit

Developer & data tools

FileFit

Can this app open, edit or convert that file format? Verified facts with sources.

Try an example: HEIC photos everywhere · Pages → Word · ODT in Microsoft Word

How it works

A compatibility graph of common document, image, video and audio formats against office apps, browsers, operating-system viewers and conversion tools. Every fact links to the vendor or caniuse source it was taken from, with its verification date; conversion paths are found by graph search.

  • Facts come only from the cited vendor documentation or the caniuse dataset, transcribed on the verification date; "not-listed" means absent from the vendor list, not proven unsupported.
  • Capabilities = all facts for the chosen format, filtered by application and operation.
  • Conversion: an app that can open/read format A and export/write format B creates an edge A→B; the shortest path is found by breadth-first search; among equally short paths the one with fewer partial-support facts and documented caveats wins.

Sources

  • FileFit curated compatibility facts

For scripts and AI agents

  • JSON API: POST https://filefit.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://filefit.usefulweb.site/mcp · tool name filefit
Example request
curl -s -X POST https://filefit.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"format":"heic","target":"any","operation":"any"}'

Related tools

  • File Format Doctor – Find out what a file really is from its bytes, why it will not open and how to convert it.
  • The Compatibility Engine – Will this charger, cable, version or PC part work together? Rule-based checks with margins.
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