15 MB BIN sample

A BIN file of exactly 15,728,640 bytes. It is a valid Binary test file file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 15 MB sample, test or dummy BIN file.

sample-bin-15mb.bin

15 MB15,728,640 bytes

Download 15 MB BIN

Created in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.

Type: application/octet-stream
SHA-256: 2347fcfc4b99e79ce651bf879df6bfaf13bb1cd6416a3a3d2184ceaa97ee1da7
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

15,728,640 pseudo-random bytes from a seeded generator, so every copy 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-15mb.bin as a hex dump: offset, bytes, then the same bytes as text.

00000000  da a8 c4 b5 cd 5b 4d 49  fa e3 af f3 83 ed 0c 1a |.....[MI........|
00000010  3a bc df 60 6f 61 73 a7  fb fc 6d 50 a0 da d0 4e |:..`oas...mP...N|
00000020  ae c3 8b 8f dd 78 1b 5e  1b 2e 24 ff 41 f2 63 71 |.....x.^..$.A.cq|
00000030  31 c8 22 ac 1b 25 9a 69  bc cd 58 4f b6 f9 89 8c |1."..%.i..XO....|

Preview

BIN files cannot be shown in a browser. Download the file and open it in an application that reads BIN, such as curl, wget and browser download managers.

Where 15 MB matters

A 15,728,640-byte file, 15 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.

All 15 MB sample files

Use this file for

Measuring download speed from your own server or CDN
Verifying checksums after transfer
Measuring upload throughput, and download throughput from your own server

Testing notes for BIN

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

BIN format reference

Technical details

File name	sample-bin-15mb.bin
Format	BIN (Binary test file)
Extension	.bin
MIME type	application/octet-stream
Size	15,728,640 bytes (15 MB)
Kind	Binary
SHA-256	2347fcfc4b99e79ce651bf879df6bfaf13bb1cd6416a3a3d2184ceaa97ee1da7
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	Not available for this file; details only
Source	Generated in your browser by this site's generator; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Testing

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-bin-15mb.bin     # Linux
shasum -a 256 sample-bin-15mb.bin # macOS

On Windows, run Get-FileHash sample-bin-15mb.bin -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 15 MB?: Yes. It is 15,728,640 bytes, which is 15 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 15 MB BIN file?: 15,728,640 pseudo-random bytes from a seeded generator, so every copy of the file is identical and compression cannot shrink it.
Why not use a file full of zeros?: Zeros compress to nearly nothing, so any compression between server and client hides the true transfer size. Random bytes do not.

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