20 MB TIFF sample

A TIFF file of exactly 20,971,520 bytes. It is a valid Tagged Image File Format file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 20 MB sample, test or dummy TIFF file.

sample-tiff-20mb.tiff

20 MB20,971,520 bytes

Download 20 MB TIFF

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

Type: image/tiff
SHA-256: 6157d47d9f084da9e07684fcac2f7fc9f65b80006d8c8a69306c5f68096f88e6
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

An uncompressed 3070 × 2277 test card in a single strip, after one image file directory of 16 tags. 90 bytes of filler in the ImageDescription tag bring the file to the exact size.

Dimensions	3,070 × 2,277 px
Colour	8-bit RGB (24 bits per pixel)
Compression	None
Byte order	Little-endian (II)
Layout	One strip, one image directory
Resolution	72 dpi

First bytes of the file

The first 64 bytes of sample-tiff-20mb.tiff as a hex dump: offset, bytes, then the same bytes as text. The TIFF signature is 49 49 2A 00.

00000000  49 49 2a 00 08 00 00 00  10 00 fe 00 04 00 01 00 |II*.............|
00000010  00 00 00 00 00 00 00 01  04 00 01 00 00 00 fe 0b |................|
00000020  00 00 01 01 04 00 01 00  00 00 e5 08 00 00 02 01 |................|
00000030  03 00 03 00 00 00 ce 00  00 00 03 01 03 00 01 00 |................|

Preview

TIFF files cannot be shown in a browser. Download the file and open it in an application that reads TIFF, such as Adobe Photoshop and GIMP.

Where 20 MB matters

A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Microsoft Outlook	20 MB of attachments by default for internet mail accounts	This file is right at the limit; add a second attachment and it is exceeded.
Gmail	25 MB per message	Under the limit, although email encoding adds about a third in transit.
GitHub web uploads	25 MiB per file added through the browser	Accepted. Pushing with Git allows larger files.
Cloudflare Pages assets	25 MiB per file	The largest round size that can be served as a static asset.
Amazon API Gateway	10 MB payload	Rejected; the upload has to go directly to object storage.
ASP.NET Core (Kestrel)	About 28.6 MB request body by default	Accepted with room for the multipart overhead.

All 20 MB sample files

Use this file for

Testing image resizing and memory use
Testing image libraries with large uncompressed input
Verifying handling of both byte orders

Testing notes for TIFF

A TIFF may hold many pages. Code that reads only the first directory silently drops the rest of a scanned document.
Support for the compression schemes varies between libraries, so a file that opens in one tool can fail in another. The samples here are uncompressed, which every reader accepts.

TIFF format reference

Technical details

File name	sample-tiff-20mb.tiff
Format	TIFF (Tagged Image File Format)
Extension	.tiff
MIME type	image/tiff
Size	20,971,520 bytes (20 MB)
Kind	Binary
Signature	49 49 2A 00
SHA-256	6157d47d9f084da9e07684fcac2f7fc9f65b80006d8c8a69306c5f68096f88e6
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	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-tiff-20mb.tiff     # Linux
shasum -a 256 sample-tiff-20mb.tiff # macOS

On Windows, run Get-FileHash sample-tiff-20mb.tiff -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 20 MB?: Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 20 MB TIFF file?: An uncompressed 3070 × 2277 test card in a single strip, after one image file directory of 16 tags. 90 bytes of filler in the ImageDescription tag bring the file to the exact size.
Are the TIFF samples compressed?: No. They hold 8-bit RGB pixels with no compression, in a single strip, in little-endian byte order. That is the baseline form of the format.

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