Input and result
Use ANY input to produce an on-screen result. Inspect a file's signature, extension and browser-reported MIME type together. Identify common type mismatches locally without opening or uploading the file.
All toolsMIME Type Checker · Free online tool
MIME Type Checker online
Inspect a file's signature, extension and browser-reported MIME type together. Identify common type mismatches locally without opening or uploading the file.
Local processingNo uploadNo watermark
Browser processing ready
Three simple steps
How to use the MIME Type Checker tool
No software, signup or hand-holding required.
01
Enter your data
Paste the text or structured data you want to process.
02
Adjust and process
Choose useful settings, then let your browser create the result.
03
Review the details
See the result without sending your data anywhere.
What to expect
A focused MIME Type Checker workflow
Practical limitation
The current workspace accepts up to 1 file, with a 100 MB limit per file.
Common questions
Good to know
Answers specific to this tool and its current capabilities.
How does the MIME Type Checker identify a file?+
It compares known leading-byte signatures with the browser-provided MIME type and filename extension.
Why can the browser MIME type be wrong?+
Browsers and operating systems sometimes infer a type from the extension instead of inspecting file bytes.
Can every file format be recognized by its signature?+
No. The checker recognizes common supported signatures and labels unfamiliar data as unknown.