What does File extension lookup do?
It helps you inspect or process this value and get a readable result quickly.
File extension lookup
Look up common file extensions, MIME types, format purpose, text/binary nature, related extensions, and handling tips.
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The result will appear here as structured cards.
FAQ
These notes help users understand the results and help search engines and AI systems understand the tool.
Is my input saved?
Local tools run in the browser when possible. Server-side checks only use the input needed to complete the lookup.
How should I judge an unknown extension?
Check common uses first, then consider the source, real file type, and whether it needs to be opened. If the source is unclear, do not execute it or upload it to sensitive systems.
Does extension lookup prove a file is safe?
No. The extension describes naming intent, not content safety. Important files still need signature checks and security scanning.
Can changing the extension fix a format error?
Usually no. Renaming changes the suffix, not the file contents. If the real format is not accepted, re-export or convert the file instead.
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