100 MB PNG sample

A PNG file of exactly 104,857,600 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 100 MB sample, test or dummy PNG file.

sample-png-100mb.png

100 MB104,857,600 bytes

Download 100 MB PNG

Created in your browser and, in browsers that can stream to disk, sent straight to your downloads list; this can take a minute. No sign-up.

Type: image/png
SHA-256: 79dc28fba8ffaa0b8abc368372666a8ca16fa29c4752b635b390458e1ac71a64
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

A 6791 × 5146 test card. The pixel data sits in a deflate stream made of stored blocks. 133 bytes of padding in a PNG tEXt comment chunk bring the file to the exact size.

Dimensions	6,791 × 5,146 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-100mb.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 1a 87 00 00 14 1a  08 02 00 00 00 cd b5 fc |................|
00000020  52 00 00 00 85 74 45 58  74 43 6f 6d 6d 65 6e 74 |R....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 100 MB matters

A 104,857,600-byte file: the request-body limit of Cloudflare's Free and Pro plans, and the size above which GitHub rejects a file outright.

All 100 MB sample files

Use this file for

Measuring download speed from your own server or CDN
Verifying dimension limits
Testing image uploads that must stay lossless

Testing notes for PNG

Every chunk carries a CRC, so a strict decoder rejects a file that was altered in transit.
PNG compresses flat colour extremely well, so a tiny file can expand to a very large bitmap. Check dimensions before decoding.

PNG format reference

Technical details

File name	sample-png-100mb.png
Format	PNG (Portable Network Graphics)
Extension	.png
MIME type	image/png
Size	104,857,600 bytes (100 MB)
Kind	Binary
Signature	89 50 4E 47 0D 0A 1A 0A
SHA-256	79dc28fba8ffaa0b8abc368372666a8ca16fa29c4752b635b390458e1ac71a64
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-100mb.png     # Linux
shasum -a 256 sample-png-100mb.png # macOS

On Windows, run Get-FileHash sample-png-100mb.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 100 MB?: Yes. It is 104,857,600 bytes, which is 100 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 100 MB PNG file?: A 6791 × 5146 test card. The pixel data sits in a deflate stream made of stored blocks. 133 bytes of padding in a PNG 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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