AnyTool
Your files never leave your device. All processing happens locally in your browser.

What is the MIME type for a file extension?

Type a file extension (like .pdf) or a MIME type (like application/json) and AnyTool instantly shows the match in both directions, with category, alternates, and a copy-ready Content-Type. It searches a bundled database of 1000+ IANA types right in your browser — no upload, works offline.

  • Bidirectional: extension to MIME type and MIME type to extension(s)
  • 1000+ bundled IANA / Apache / nginx types
  • Category filter (images, video, audio, text, apps, fonts, docs)
  • Dot-optional input and alternate/legacy type options
  • 100% in-browser filter-as-you-type — offline-ready

What is

MIME Type

A MIME type (media type or Content-Type) is a standardized label like text/html or image/png that tells software what kind of data a file contains. Servers send it in the Content-Type header so browsers know how to handle a response.

Developer Tools

Related terms

Content-TypeFile ExtensionIANAmedia typeHTTP Header

Frequently Asked Questions

No — the whole database is bundled, so lookups happen offline in your browser.

Nothing is uploaded. The entire dataset is bundled into the page, so searches run instantly in-memory and the tool works with no network after first load — unlike tools that upload a file to detect its type.

Yes — it bundles 1000+ types from the canonical IANA/Apache/nginx dataset.

The tool ships the full mime-db dataset (IANA plus Apache and nginx mappings), covering 1000+ types and modern formats like WebP, AVIF, HEIC, WebAssembly, and woff2 — far broader than the 50-300 entries many lookup sites offer.

Yes — reverse lookup shows all extensions mapped to a given MIME type.

Enter a MIME type like image/jpeg and it lists every matching extension (jpg, jpeg, jpe), marking the primary one — and entering an extension shows all valid MIME types for it.

Detailed Explanation

Methodology

How the MIME Type Lookup Works

AnyTool bundles the canonical mime-db dataset (IANA plus Apache and nginx mappings, 1000+ types) and builds a forward map (extension to MIME types) and a reverse map (MIME type to extensions) once at load, so every lookup is instant and in-memory. Input is normalized client-side (lowercase, strip the leading dot), and the tool auto-detects whether you typed an extension or a MIME type by the presence of a slash, surfacing all matches plus category, charset, and compressible metadata.

  • 1000+ bundled types from IANA/Apache/nginx (mime-db)
  • Bidirectional: extension to MIME type and back
  • Filter-as-you-type with category pills, fully in-memory
  • Dot-optional input; shows alternate/legacy types
  • Surfaces charset and compressible metadata; copy Content-Type
Privacy & Security

Privacy and Offline Use

The entire database (~190KB raw, gzips small) is bundled, so the tool makes no network calls and works offline after first load, with nothing uploaded — unlike tools that upload a file to detect its content type or sit behind an ad-wall. Deep-linkable URLs (?ext=pdf) make common lookups shareable.

MIME Type Lookup: AnyTool vs typical tools
CapabilityAnyToolTypical tools
Database size1000+ types (mime-db)Often 50-300
Bidirectional lookupYesSometimes one-way
Filter-as-you-typeYesVaries
Charset / compressible metaYesRare
Works offlineYes (bundled)No

Capabilities reflect the live AnyTool tool; competitor behavior varies by service.