Format Odyssey

File Format & Extension Lookup

Look up a file extension, file format, or MIME type, or analyze a local file directly in your browser. Open detailed guides for compatibility, MIME types, software, and related formats.

    Try:.pdf.heicimage/pngapplication/zip
    Source-backedOfficial docs first
    Unknown stays unknownNo guessed fields
    Browser-localFiles stay on device
    Browse by family

    Start with the file type.

    Choose the workflow family first, then open a source-backed format guide for structure, software support, and limitations.

    IMGImagesPNG, JPG, WebP, AVIF, HEIC, HEIF, SVGDOCDocumentsPDF, EPUB, ODT, XPS, SRT, DCMDATADataCSV, JSON, XML, YAML, TOML, KMZ3D3D modelsSTL, OBJ, GLB, glTF, 3MFFONTFontsTTF, OTF, WOFF2ZIPArchivesZIP, GZ, TIB, GHOSYSCommon & systemICS, MID, VBS, URL, CAMRECMIMEMIME lookupExtension and MIME type reference
    Tools

    Useful before you open the file.

    Small browser-local utilities that complement the reference pages without turning the site into a heavy converter suite.

    Tool 01

    File Header Analyzer

    Inspect supported headers, report conflicts, and optionally calculate SHA-256 — all locally.

    Check a file header    Tool 02

    MIME Type Lookup

    Look up reviewed MIME types and file extensions in either direction using the same canonical format records.

    Open lookup
    How Format Odyssey works

    Facts first. Unknowns stay visible.

    Each guide separates reviewed facts from unknown or not-yet-reviewed fields, so the page does not fill technical gaps with guesses.

    01 · IdentifyExtension, MIME, family, and intended workflow.
    02 · VerifyPrefer standards and vendor documentation for technical claims.
    03 · Expose gapsUnknown, none, and not-applicable remain distinct.