50 KB BMP sample

A BMP file of exactly 51,200 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 50 KB sample, test or dummy BMP file.

sample-bmp-50kb.bmp

50 KB51,200 bytes

Download 50 KB BMP

Created 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: ad181f66f6cb77b2edf670267168f964ba0c0cc7cf44ab33bf29486fd47d9d6f
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

An uncompressed 150 × 113 test card. 70 bytes of unused space between the header and the pixel array bring the file to the exact size.

Dimensions	150 × 113 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-50kb.bmp as a hex dump: offset, bytes, then the same bytes as text. The BMP signature is 42 4D.

00000000  42 4d 00 c8 00 00 00 00  00 00 7c 00 00 00 28 00 |BM........|...(.|
00000010  00 00 96 00 00 00 71 00  00 00 01 00 18 00 00 00 |......q.........|
00000020  00 00 84 c7 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 50 KB matters

A 51,200-byte file, half of the default body limit in several web frameworks. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Express body parsers	100 KB by default	50 KB is accepted; 500 KB is rejected with 413 unless the limit is raised.
Base64 encoding	Adds 33 percent	50 KB becomes about 67 KB when embedded in JSON.

All 50 KB sample files

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.

BMP format reference

Technical details

File name	sample-bmp-50kb.bmp
Format	BMP (Windows bitmap)
Extension	.bmp
MIME type	image/bmp
Size	51,200 bytes (50 KB)
Kind	Binary
Signature	42 4D
SHA-256	ad181f66f6cb77b2edf670267168f964ba0c0cc7cf44ab33bf29486fd47d9d6f
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-50kb.bmp     # Linux
shasum -a 256 sample-bmp-50kb.bmp # macOS

On Windows, run Get-FileHash sample-bmp-50kb.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 50 KB?: Yes. It is 51,200 bytes, which is 50 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 50 KB BMP file?: An uncompressed 150 × 113 test card. 70 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.

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