100 MB EML sample

An EML file of exactly 104,857,600 bytes. It is a valid Email message 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 EML file.

sample-eml-100mb.eml

100 MB104,857,600 bytes

Download 100 MB EML

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: message/rfc822
SHA-256: 11b2e2fbc2f75adfd46b5b36215fd17c504297db8d9c427dc4f08118e8baede6
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

A plain-text email message with standard headers and 313,335 paragraphs wrapped at 72 characters. Lines of dashes at the end of the body bring the file to the exact size.

Paragraphs	313,335
Content type	text/plain, 7bit
Attachments	None
Line endings	CRLF (RFC 5322)
Encoding	UTF-8 (ASCII characters only)

How the file begins

The opening lines of sample-eml-100mb.eml, exactly as they appear in the file.

00000000  46 72 6f 6d 3a 20 22 53  61 6d 70 6c 65 54 65 73 |From: "SampleTes|
00000010  74 46 69 6c 65 73 20 53  61 6d 70 6c 65 73 22 20 |tFiles Samples" |
00000020  3c 73 61 6d 70 6c 65 73  40 65 78 61 6d 70 6c 65 |<samples@example|
00000030  2e 63 6f 6d 3e 0d 0a 54  6f 3a 20 22 54 65 73 74 |.com>..To: "Test|

Preview

Creates the file in your browser and shows the first 64 KB of it.

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

Finding the first upload limit in a new stack
Testing help-desk and archiving software
Testing email parsers and import features

Testing notes for EML

Header values can be folded across lines and encoded with RFC 2047 encoded-words; parsers that read headers line by line get subjects wrong.
An HTML body is untrusted HTML and needs sanitising before display.

EML format reference

Technical details

File name	sample-eml-100mb.eml
Format	EML (Email message)
Extension	.eml
MIME type	message/rfc822
Size	104,857,600 bytes (100 MB)
Kind	Text
SHA-256	11b2e2fbc2f75adfd46b5b36215fd17c504297db8d9c427dc4f08118e8baede6
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	Email & Calendar

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-eml-100mb.eml     # Linux
shasum -a 256 sample-eml-100mb.eml # macOS

On Windows, run Get-FileHash sample-eml-100mb.eml -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 EML file?: A plain-text email message with standard headers and 313,335 paragraphs wrapped at 72 characters. Lines of dashes at the end of the body bring the file to the exact size.
Are the email addresses real?: No. They use example.com and example.org, which are reserved for documentation and cannot receive mail.

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