Check If an Image Is a BMP
Read a file's real bytes to confirm whether it is a true BMP. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Check If an Image Is a BMP
- 1. Upload the file in question. Drop in the file you suspect might not really be a BMP, regardless of what its extension claims. The tool reads its raw bytes rather than trusting the filename.
- 2. See the header check. The tool looks at the first bytes for the BM signature that every true bitmap file starts with, then reports whether the file is genuinely a BMP or something else entirely.
- 3. Read the verdict. Copy or note the yes-or-no answer, which also names the actual format detected when the file was mislabeled, such as a GIF or PNG saved with a .bmp extension.
When to use Check If an Image Is a BMP
Check If an Image Is a BMP inspects a file's actual magic bytes instead of trusting its extension, so it catches files that were renamed or mislabeled. Use it whenever a pipeline or upload form needs to be certain a file is a real bitmap before processing it.
- Validating an upload before processing. A batch-processing script only handles true BMP bitmaps and would crash on a mislabeled file. Checking each upload first avoids feeding the wrong byte layout into a strict decoder.
- Auditing a downloaded asset pack. A design asset archive has files with .bmp extensions from an unreliable source. Running each through the check confirms which ones are genuine bitmaps before importing them into a project.
- Debugging a broken image import. An image viewer refuses to open a file that is supposedly a bitmap. Checking its real signature quickly reveals it was actually saved as a GIF with the wrong file extension.
Examples
Renamed file
Input
bitmap.bmp (actually a GIF)
Output
No — it looks like a GIF file.
About the Check If an Image Is a BMP tool
Check If an Image Is a BMP runs as plain JavaScript in your browser tab, with no server behind it. Read a file's real bytes to confirm whether it is a true BMP. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Image Tools section, 200 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
There is nothing to configure. Provide the input and the result appears on its own. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Check If an Image Is a BMP cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
Which files does Check If an Image Is a BMP accept?
It accepts images in any common format (PNG, JPG, WebP, GIF and more). There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.