50 KB BIN sample file

A BIN file of exactly 51,200 bytes. It is a valid Binary test file file, generated for this site and checked with an independent parser.

sample-bin-50kb.bin

50 KB51,200 bytes

Download 50 KB BIN

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Type: application/octet-stream
SHA-256: 611232abe5179b14ff3f3727debe09ea976d0607680744da111fa9ea938c8ed0
Direct URL: https://sampletestfiles.com/downloads/bin/sample-bin-50kb.bin

What is in this file

51,200 pseudo-random bytes from a seeded generator, so every build of the file is identical and compression cannot shrink it.

Content	Pseudo-random bytes
Compressible	No
Structure	None

First bytes of the file

The first 64 bytes of sample-bin-50kb.bin as a hex dump: offset, bytes, then the same bytes as text.

00000000  cd c5 3c fc f6 53 f8 6e 55 c6 8c e7 2c e2 fe 41  |..<..S.nU...,..A|
00000010  a4 fa b6 27 ee b8 19 ce 00 da 0a 58 6d 67 e1 76  |...'.......Xmg.v|
00000020  89 e5 b4 34 f7 e0 f4 b3 bc a8 42 bd 83 66 d1 c3  |...4......B..f..|
00000030  23 b5 ce 07 5c 3c 1f 4a 6d 6e fb 05 a2 86 85 fa  |#...\<.Jmn......|

Preview

BIN files cannot be shown in a browser. Download the file and open it with curl, wget and browser download managers.

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

Testing document previews
Measuring download and upload throughput
Testing size limits precisely

Testing notes for BIN

A file of zeros, as produced by many quick commands, compresses to almost nothing, which makes transfers look far faster than they are.
Because application/octet-stream says nothing about content, strict upload filters reject these files. That is itself a useful test.

BIN format reference

Technical details

File name	sample-bin-50kb.bin
Format	BIN (Binary test file)
Extension	.bin
MIME type	application/octet-stream
Size	51,200 bytes (50 KB)
Kind	Binary
SHA-256	611232abe5179b14ff3f3727debe09ea976d0607680744da111fa9ea938c8ed0
Created	2026-10-10
Validation	Exact size, signature bytes and structure checked when the file was generated
Preview	Not available for this format; details only
Source	Generated for this site; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Testing

Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-bin-50kb.bin 'https://sampletestfiles.com/downloads/bin/sample-bin-50kb.bin'
sha256sum sample-bin-50kb.bin     # Linux
shasum -a 256 sample-bin-50kb.bin # macOS

On Windows, run Get-FileHash sample-bin-50kb.bin -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

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 BIN file?: 51,200 pseudo-random bytes from a seeded generator, so every build of the file is identical and compression cannot shrink it.
Is a .bin sample safe to download?: Yes. It is inert data: random bytes that are not executable and have no structure for any program to interpret.

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