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MIME Type Finder

Look up the MIME content-type for any file extension.

Best for: Use it when configuring a server, upload validation, or a Content-Type header.

Complete guide

Input

How it's calculated & sources
The MIME Type Finder uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is MIME Type Finder?
A MIME type finder tells you the correct Content-Type for a file extension (and vice versa) - essential for serving files correctly.
Why does MIME Type Finder matter?
The MIME type a server should send so browsers handle the file correctly. The wrong type can trigger downloads or block rendering.
How is MIME Type Finder calculated?
It looks the extension up in a table of standard MIME types (for example .json to application/json).
What are common mime type finder mistakes?
Serving JavaScript or fonts with the wrong type, which browsers may reject.
When should you use the MIME Type Finder?
Use it when configuring a server, upload validation, or a Content-Type header.

What is the MIME Type Finder?

A MIME type finder tells you the correct Content-Type for a file extension (and vice versa) - essential for serving files correctly.

How the MIME Type Finder works

It looks the extension up in a table of standard MIME types (for example .json to application/json).

Common mistakes to avoid

  • Serving JavaScript or fonts with the wrong type, which browsers may reject.
  • Trusting the extension over the file's real contents.
  • Using text/plain for files that need a specific type.

Keywords: mime, content-type, extension.

Runs entirely in your browser - your data is not uploaded.

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the MIME Type Finder free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the MIME Type Finder?+

MIME Type Finder uses the standard mime type finder formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The MIME Type Finder runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the MIME Type Finder on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Share-to-grow kit (Reddit, LinkedIn, Medium)
Reddit post
Title: I built/used this free mime type finder — instant, no signup

Body: Look up the MIME content-type for any file extension. Try it: https://freetoolsgalaxy.com/tools/mime-type-finder
LinkedIn post
MIME Type Finder on Free Tools Galaxy — Look up the MIME content-type for any file extension. https://freetoolsgalaxy.com/tools/mime-type-finder
Medium intro
# MIME Type Finder — the free tool I keep coming back to

Look up the MIME content-type for any file extension.

Try it: https://freetoolsgalaxy.com/tools/mime-type-finder
Quora answer
The fastest way is to use a free in-browser mime type finder: https://freetoolsgalaxy.com/tools/mime-type-finder. Look up the MIME content-type for any file extension.

Embed this tool anywhere

Free embed code for blogs, docs and dashboards. Every embed sends a backlink home — helping you and the galaxy grow together.

HTML iframe
Drop into any site — auto-resizes to its content height, theme-aware.
<iframe src="https://freetoolsgalaxy.com/tools/mime-type-finder?embed=1" title="MIME Type Finder" loading="lazy"
  style="width:100%;height:600px;border:0;border-radius:16px;background:#0b1020"
  allow="clipboard-write"></iframe>
<script>window.addEventListener("message",function(e){if(e.data&&e.data.type==="ftg-embed-height"){document.querySelectorAll("iframe").forEach(function(f){if(f.contentWindow===e.source){f.style.height=e.data.height+"px";}});}});</script>
<p><a href="https://freetoolsgalaxy.com/tools/mime-type-finder" target="_blank" rel="noopener">Powered by MIME Type Finder on Free Tools Galaxy</a></p>
Responsive wrapper
Aspect-locked container — good for blog post bodies.
<div style="position:relative;padding-bottom:75%;height:0;overflow:hidden;border-radius:16px">
  <iframe src="https://freetoolsgalaxy.com/tools/mime-type-finder?embed=1" title="MIME Type Finder" loading="lazy"
    style="position:absolute;inset:0;width:100%;height:100%;border:0" allow="clipboard-write"></iframe>
</div>
WordPress / Markdown
Paste in a custom-HTML block or markdown file.
[MIME Type Finder — free online tool](https://freetoolsgalaxy.com/tools/mime-type-finder)

<iframe src="https://freetoolsgalaxy.com/tools/mime-type-finder?embed=1" width="100%" height="600" frameborder="0"></iframe>
Text link-back
Minimal credit link — best for sidebars and footers.
<a href="https://freetoolsgalaxy.com/tools/mime-type-finder" target="_blank" rel="noopener">Try the free MIME Type Finder</a>

Share-to-Grow Kit

Pre-written, ready-to-paste posts for every major channel. Help others discover this tool — and earn backlinks.

Title
I built a free image converter that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick image converter and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard image use cases (image, convert, png, jpeg) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/image-converter

Happy to take feedback — what's missing?
Post to a relevant subreddit (e.g. r/InternetIsBeautiful, r/webdev, r/productivity). Avoid spammy subs.
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