3 MB PNG sample

A PNG file of exactly 3,145,728 bytes. It is a valid Portable Network Graphics 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 PNG file.

sample-png-3mb.png

3 MB3,145,728 bytes

Download 3 MB PNG

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

Type: image/png
SHA-256: 7fafa97ac8b74dd6cee26b0ab70e2dc16a9248f4884ccd3f8876d8137957069f
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

A 1187 × 883 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 47 bytes of tEXt comment chunk bring the file to the exact size.

Dimensions	1,187 × 883 px
Colour type	Truecolour RGB, 8 bits per channel
Transparency	No
Compression	Deflate stream of stored blocks
Interlaced	No

First bytes of the file

The first 64 bytes of sample-png-3mb.png as a hex dump: offset, bytes, then the same bytes as text. The PNG signature is 89 50 4E 47 0D 0A 1A 0A.

00000000  89 50 4e 47 0d 0a 1a 0a  00 00 00 0d 49 48 44 52 |.PNG........IHDR|
00000010  00 00 04 a3 00 00 03 73  08 02 00 00 00 fa 01 4c |.......s.......L|
00000020  e7 00 00 00 23 74 45 58  74 43 6f 6d 6d 65 6e 74 |....#tEXtComment|
00000030  00 53 61 6d 70 6c 65 54  65 73 74 46 69 6c 65 73 |.SampleTestFiles|

Preview

Creates the file in your browser and shows it here. Nothing large is downloaded from our server.

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.

All 3 MB sample files

Use this file for

Finding out whether a 1 MB default has been raised
Checking transparency handling
Testing image optimisation and conversion

Testing notes for PNG

PNG compresses flat colour extremely well, so a tiny file can expand to a very large bitmap. Check dimensions before decoding.
Converting a transparent PNG to JPEG needs a background colour; pipelines that forget produce black backgrounds.

PNG format reference

Technical details

File name	sample-png-3mb.png
Format	PNG (Portable Network Graphics)
Extension	.png
MIME type	image/png
Size	3,145,728 bytes (3 MB)
Kind	Binary
Signature	89 50 4E 47 0D 0A 1A 0A
SHA-256	7fafa97ac8b74dd6cee26b0ab70e2dc16a9248f4884ccd3f8876d8137957069f
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-png-3mb.png     # Linux
shasum -a 256 sample-png-3mb.png # macOS

On Windows, run Get-FileHash sample-png-3mb.png -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 PNG file?: A 1187 × 883 test card. The pixel data sits in a deflate stream made of stored blocks, so the size is set by the pixel count. 47 bytes of tEXt comment chunk bring the file to the exact size.
Is there a sample with transparency?: Yes. The curated library includes a 512 × 512 PNG with an alpha gradient.

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