Format Odyssey
File format reference

Know your file.
Understand its format.

Search a format, inspect a local file, or look up a MIME type — start with the action you need, then go deeper into source-backed technical details.

    Try:.pdf.heicapplication/zip
    Source-backedStandards and vendor docs first
    Unknown stays unknownNo guessed technical fields
    Browser-local toolsNo selected file upload
    Built for lookupExtensions, MIME, formats, workflows
    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
    Popular formats

    Common formats, ready to inspect.

    Representative launch formats across the main clusters.

    ICSiCalendarCalendar exchangeSTLSTL3D geometryJSONJSONStructured dataHEICHEICHigh-efficiency imageZIPZIPArchive containerWOFF2WOFF2Web font
    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 Analyzer

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

    Open analyzer    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.