# FileFit

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

Part of usefulweb.site (https://usefulweb.site/). Results are deterministic calculations from the inputs and the listed assumptions; the API returns exactly what the web page shows.

## Use it
- Human interface: https://filefit.usefulweb.site/ (interactive tool at https://filefit.usefulweb.site/tool)
- JSON API: POST https://filefit.usefulweb.site/api/v1/calculate with a JSON object of inputs (schema: https://filefit.usefulweb.site/api/v1/tool)
- OpenAPI: https://filefit.usefulweb.site/openapi.json
- MCP (Streamable HTTP): https://filefit.usefulweb.site/mcp - tool `filefit`

## Inputs
- format (select): File format
- target (select): Application, or format to convert to
- operation (select): What do you want to do?

## Method
- 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.