3 MB BMP sample
A BMP file of exactly 3,145,728 bytes. It is a valid Windows bitmap file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 3 MB sample, test or dummy BMP file.
Download
sample-bmp-3mb.bmp
3 MB3,145,728 bytes
Download 3 MB BMPCreated in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.
- Type
- image/bmp
- SHA-256
7b78ccbe83826ee694d3475ee8975b602ba2fec1a2e697bb97ac44227f7c4521- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
An uncompressed 1182 × 886 test card. 2,146 bytes of unused space between the header and the pixel array bring the file to the exact size.
| Dimensions | 1,182 × 886 px |
|---|---|
| Bit depth | 24-bit RGB |
| Compression | None (BI_RGB) |
| Header | BITMAPINFOHEADER (40 bytes) |
| Row order | Bottom-up |
First bytes of the file
The first 64 bytes of sample-bmp-3mb.bmp as a hex dump: offset, bytes, then the same bytes as text. The BMP signature is 42 4D.
00000000 42 4d 00 00 30 00 00 00 00 00 98 08 00 00 28 00 |BM..0.........(.|
00000010 00 00 9e 04 00 00 76 03 00 00 01 00 18 00 00 00 |......v.........|
00000020 00 00 68 f7 2f 00 13 0b 00 00 13 0b 00 00 00 00 |..h./...........|
00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|Preview
Creates the file in your browser and shows it here.
Where 3 MB matters
A 3,145,728-byte file, 3 MB in the binary units that operating systems and upload limits use. It is useful wherever a form, an API gateway, a storage quota or a mail server is configured with a limit of about this size.
Use this file for
- Finding the first upload limit in a new stack
- Testing decoders for legacy formats
- Testing size limits with naturally large images
Testing notes for BMP
- Row padding and bottom-up order are the usual causes of skewed or upside-down images in hand-written decoders.
- Some validators accept BMP by MIME type but have no decoder for it, which fails later in the pipeline.
Technical details
| File name | sample-bmp-3mb.bmp |
|---|---|
| Format | BMP (Windows bitmap) |
| Extension | .bmp |
| MIME type | image/bmp |
| Size | 3,145,728 bytes (3 MB) |
| Kind | Binary |
| Signature | 42 4D |
| SHA-256 | 7b78ccbe83826ee694d3475ee8975b602ba2fec1a2e697bb97ac44227f7c4521 |
| Created | 2026-10-23 |
| Validation | See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility. |
| Preview | Available on this page |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Images |
Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.
sha256sum sample-bmp-3mb.bmp # Linux
shasum -a 256 sample-bmp-3mb.bmp # macOSOn Windows, run Get-FileHash sample-bmp-3mb.bmp -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.
Related files
Questions about this file
- Is this file exactly 3 MB?
- Yes. It is 3,145,728 bytes, which is 3 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 3 MB BMP file?
- An uncompressed 1182 × 886 test card. 2,146 bytes of unused space between the header and the pixel array bring the file to the exact size.
- What bit depth are the BMP samples?
- 24-bit RGB with no compression and no colour table.