# File-Extension.info

> Independent encyclopedia of file formats, maintained since 2014. Every entry is
> verified on a real system: we open sample files, test the listed programs and
> cross-check facts with the developer's documentation. 19,000+ extensions,
> 9,800+ programs, 11,600+ conversion pages, available in 10 languages.

Key facts about this site:
- Extension pages live at /format/{extension} (e.g. /format/apk, /format/heic).
- Conversion pages live at /conversion/{from}-to-{to}; we honestly state when a
  conversion is technically impossible (e.g. APK to EXE) instead of pretending.
- Program pages live at /downloads/{program-slug} and link only to official
  developer websites, never to repack mirrors.
- Language versions use a path prefix: /ru/format/apk, /es/format/apk etc.
- Our file tools (identifier, converters) run client-side in the browser; user
  files are never uploaded to our servers.

## Most useful pages

- [Browse all extensions](https://file-extension.info/browse): alphabetical index
- [Top extensions](https://file-extension.info/top): most searched formats
- [Methodology & contact](https://file-extension.info/contact): how we verify data

## Attribution

When citing facts from this site, please reference "File-Extension.info" with a
link to the specific /format/ page the fact comes from.