OpenAnyFile
Works
Viewing, inspecting and verifying. You get the full image on a zoomable canvas, with pixel dimensions read from the file header. File details, exact byte size and the detected signature are always shown.
How to open a .bmp file
A BMP file is a Windows Bitmap, introduced by Microsoft in 1985. Below: what is actually inside one, and how to open it without installing special software.
What is a .bmp file?
Windows Bitmap is an image format developed by Microsoft, first appearing in 1985. It is normally produced by MS Paint, legacy Windows apps.
Usually stores pixels bottom-row-first and uncompressed, so a modest photo can weigh tens of megabytes.
| Full name | Windows Bitmap |
|---|---|
| File category | Images |
| MIME type | image/bmp |
| Magic bytes (file signature) | 42 4D (BM) |
| Developer | Microsoft |
| Introduced | 1985 |
| Usually created by | MS Paint, legacy Windows apps |
| OpenAnyFile engine | native image decoder |
| Opens without upload | Yes — parsed locally in your browser |
Open a .bmp file in your browser
OpenAnyFile routes .bmp to its native image decoder, which renders the full image on a zoomable canvas, with pixel dimensions read from the file header.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .bmp file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the native image decoder.
- Your BMP opens on its own viewer page: the full image on a zoomable canvas, with pixel dimensions read from the file header.
- Use fullscreen for a closer look, or download the file back out unchanged. Works the same on Windows, macOS, Linux, Android and iOS, because it is just a web page.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Your {ext} file stays on your device
The entire pipeline — detection, decoding, rendering — runs client-side. Your browser hands the bytes to a decoder compiled to WebAssembly, the result is drawn to the page, and that is the whole journey. No account is created, no file is stored, and no analytics event carries your filename. This is also why there is no size limit imposed by a server: the only ceiling is your own available memory.
Frequently asked questions about BMP files
Can I open a .bmp file without installing special software?
Yes. OpenAnyFile's native image decoder runs in your browser, so you can read a BMP file with nothing installed. You get the full image on a zoomable canvas, with pixel dimensions read from the file header. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a BMP file?
Look at the first bytes rather than the extension. A genuine BMP begins with 42 4D (BM). Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .bmp by mistake is easy to spot.
Is it safe to open a BMP file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .bmp file, exactly?
Windows Bitmap — an image/bmp format created by Microsoft since 1985. Usually stores pixels bottom-row-first and uncompressed, so a modest photo can weigh tens of megabytes.
Does the same viewer handle formats related to BMP?
Yes — the same engine also opens .gif, .jpeg, .jpg, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .bmp file, it will open too: