20 MB JPG sample

A JPG file of exactly 20,971,520 bytes. It is a valid JPEG image 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 JPG file.

sample-jpg-20mb.jpg

20 MB20,971,520 bytes

Download 20 MB JPG

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

Type: image/jpeg
SHA-256: 5c7e816d7c7f6576a891846580b0a0f8010d82721fe2b18362d68e08ba7c9900
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

A 7337 × 5503 test card with fine grain, encoded as a baseline JPEG at quality 90. 2,006 bytes of JPEG comment (COM) segment bring the file to the exact size.

Dimensions	7,337 × 5,503 px
Encoding	Baseline DCT, Huffman
Chroma subsampling	4:4:4
Quality	90
Metadata	JFIF header and a comment, no EXIF
Progressive	No

First bytes of the file

The first 64 bytes of sample-jpg-20mb.jpg as a hex dump: offset, bytes, then the same bytes as text. The JPG signature is FF D8 FF.

00000000  ff d8 ff e0 00 10 4a 46  49 46 00 01 01 01 00 48 |......JFIF.....H|
00000010  00 48 00 00 ff fe 07 d4  53 61 6d 70 6c 65 54 65 |.H......SampleTe|
00000020  73 74 46 69 6c 65 73 20  73 61 6d 70 6c 65 20 4a |stFiles sample J|
00000030  50 45 47 2e 20 50 61 64  64 69 6e 67 3a 20 2e 2e |PEG. Padding: ..|

Preview

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

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

Measuring download speed from your own server or CDN
Testing lazy loading and responsive images
Testing image upload, resize and thumbnail pipelines

Testing notes for JPG

Photos from phones carry EXIF data including location; the samples here contain none.
A small file can decode to a huge bitmap. Validate pixel dimensions as well as bytes, or a 5 MB upload can demand hundreds of megabytes of memory.

JPG format reference

Technical details

File name	sample-jpg-20mb.jpg
Format	JPG (JPEG image)
Extension	.jpg
MIME type	image/jpeg
Size	20,971,520 bytes (20 MB)
Kind	Binary
Signature	FF D8 FF
SHA-256	5c7e816d7c7f6576a891846580b0a0f8010d82721fe2b18362d68e08ba7c9900
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-jpg-20mb.jpg     # Linux
shasum -a 256 sample-jpg-20mb.jpg # macOS

On Windows, run Get-FileHash sample-jpg-20mb.jpg -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 JPG file?: A 7337 × 5503 test card with fine grain, encoded as a baseline JPEG at quality 90. 2,006 bytes of JPEG comment (COM) segment bring the file to the exact size.
Why do larger samples have larger pixel dimensions?: The quality setting is fixed at 90, so the only way to reach a bigger file is a bigger picture. The dimensions are listed on each download page.

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