Find any MIME type by extension
Click any row to copy. Search by file extension, MIME type, or category. Runs entirely in your browser.
How to look up a MIME type
Search by extension or MIME, then click a row to copy.
- 01
Search the catalog
Type
.webp,application/json, orvideo.Lookups reference the IANA registries (MIME, HTTP status, TLDs) bundled at build time — no live network calls, no rate limits, no leaked queries.
searchIANAregistryofflinelivequery · querywebp · IANA.webp → image/webp
loaded · IANA bundlespec · ready - 02
Browse by category
Categories include image, video, application, text, audio, and font.
Builders emit canonical syntax per the relevant RFC (9110 for HTTP, 5322 for headers, 3986 for URLs) so the output passes spec-compliant parsers.
browseRFC 9110canonicalspec-compliantlivecat · optionsimage · live.png .jpg .svg .webp
options applied · livecanonical - 03
Copy a MIME
Click any row to grab the canonical
type/subtypestring for aContent-Typeheader.Validation flags common pitfalls — uppercase header names, smart quotes inside
Content-Type, missing;charset=utf-8— before they bite production.copyvalidationlintpitfallsliverow · looked upjson · readyapplication/json
result · livevalidated - 04
Use in a header
Set on your response:
Content-Type: application/json; charset=utf-8.Copy writes the snippet directly into your clipboard; downloads emit the right extension and MIME so curl/httpie pick them up correctly.
useclipboardMIME-correctblobcurl-readyok · copiedready · doneContent-Type: application/json
shipped · ready to shipsuccess
Web-spec details that bite later
Idempotency saves retries
POST/PUT/DELETE should be safely retried. Use idempotency keys and return the same response on duplicate requests.
Match RFC 9110 status codes
Don’t invent codes. 422 for validation errors, 409 for conflicts, 429 for rate limits. Standard codes work with off-the-shelf clients.
Set <code>Cache-Control</code> deliberately
Default browser caching is conservative. Use max-age + stale-while-revalidate for hot endpoints.
Validate Open Graph in dev
OG tags break silently. Use a previewer like OG Generator + Facebook’s debugger before launch.
CORS is a server concern
The browser sends the preflight; the server decides. Wildcard origins disable credentials — be explicit.
MIME drives behaviour
Servers must send the right Content-Type. Browsers sniff but the spec says they shouldn’t — be explicit to avoid surprises.
When to look up a MIME
File uploads, downloads, content-negotiation.
Setting Content-Type
Pick the canonical MIME for the response. Bundled from IANA registries at build time — no live network call, no rate limit, no leaked queries. The MIME, TLD, and status-code tables are baked in so the tool works offline once loaded.
spec-compliantFile-upload allow-lists
Restrict uploads to the right MIMEs. Output is canonical per the relevant RFC (9110 for HTTP, 5322 for headers, 3986 for URLs), so spec-compliant parsers accept it as-is. Cross-browser and cross-library behaviour stays consistent.
offlineStatic asset serving
Configure nginx/Apache mime.types. Pairs with the curl-to-fetch converter for end-to-end test stubs — copy the curl from DevTools, paste, get an idiomatic fetch() body. Drop into Playwright/Vitest fixtures without manual translation.
IANA-backedEmail attachments
Set the MIME on multipart parts. Catches common pitfalls (uppercase header names, smart quotes inside Content-Type, missing ;charset=utf-8) before they bite production. Validation flags rather than auto-corrects so you stay in control.
RFC-alignedBrowser sniffing
Pair with X-Content-Type-Options: nosniff. Validation runs as you type — copy only when the output is shaped correctly. The output drops directly into nginx, Apache, or CDN configs without re-formatting or re-quoting.
production-gradeContent negotiation
Match Accept request headers to served MIMEs. Same input plus same options always produces identical canonical output, so the tool is safe to embed in CI scripts that diff against expected configs.
negot.Frequently asked questions
Something missing?
Tell us what you need. We ship the top requests every two weeks.