1 KB BMP sample
A BMP file of exactly 1,024 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 1 KB sample, test or dummy BMP file.
Download
sample-bmp-1kb.bmp
1 KB1,024 bytes
Download 1 KB 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
6682217dd491b816f51f44f260ad75e73e7c3bc7ccb2f28d6c84988b4f6377b1- Delivery
- Created in your browser from static generator assets (how it works).
What is in this file
An uncompressed 20 × 16 test card. 10 bytes of unused space between the header and the pixel array bring the file to the exact size.
| Dimensions | 20 × 16 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-1kb.bmp as a hex dump: offset, bytes, then the same bytes as text. The BMP signature is 42 4D.
00000000 42 4d 00 04 00 00 00 00 00 00 40 00 00 00 28 00 |BM........@...(.|
00000010 00 00 14 00 00 00 10 00 00 00 01 00 18 00 00 00 |................|
00000020 00 00 c0 03 00 00 13 0b 00 00 13 0b 00 00 00 00 |................|
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 1 KB matters
The smallest practical test file: 1,024 bytes, small enough to travel in a single network packet. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Ethernet | 1,500 bytes (typical MTU) | A 1 KB payload fits in one packet with its headers. |
| Browser cookies | 4,096 bytes per cookie | 1 KB is well inside the limit; the 5 KB sample is over it. |
Use this file for
- Checking thumbnail and icon handling
- 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-1kb.bmp |
|---|---|
| Format | BMP (Windows bitmap) |
| Extension | .bmp |
| MIME type | image/bmp |
| Size | 1,024 bytes (1 KB) |
| Kind | Binary |
| Signature | 42 4D |
| SHA-256 | 6682217dd491b816f51f44f260ad75e73e7c3bc7ccb2f28d6c84988b4f6377b1 |
| 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-1kb.bmp # Linux
shasum -a 256 sample-bmp-1kb.bmp # macOSOn Windows, run Get-FileHash sample-bmp-1kb.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 1 KB?
- Yes. It is 1,024 bytes, which is 1 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 KB BMP file?
- An uncompressed 20 × 16 test card. 10 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.