500 KB EML sample

An EML file of exactly 512,000 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 500 KB sample, test or dummy EML file.

sample-eml-500kb.eml

500 KB512,000 bytes

Download 500 KB EML

Created in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.

Type: message/rfc822
SHA-256: e71ea27e779470c264956ce98ec0a1341a3fa112c162d1366336cea95965359b
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 1,531 paragraphs wrapped at 72 characters. Lines of dashes at the end of the body bring the file to the exact size.

Paragraphs	1,531
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-500kb.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 500 KB matters

A 512,000-byte file: larger than most API body limits, smaller than most upload limits. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Amazon DynamoDB items	400 KB per item	500 KB cannot be stored as a single item.
Express body parsers	100 KB by default	Rejected unless the limit is raised.
nginx request body	1 MB by default (client_max_body_size)	Accepted with room to spare.

All 500 KB sample files

Use this file for

Checking email size handling
Testing help-desk and archiving software
Testing email parsers and import features

Testing notes for EML

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

EML format reference

Technical details

File name	sample-eml-500kb.eml
Format	EML (Email message)
Extension	.eml
MIME type	message/rfc822
Size	512,000 bytes (500 KB)
Kind	Text
SHA-256	e71ea27e779470c264956ce98ec0a1341a3fa112c162d1366336cea95965359b
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-500kb.eml     # Linux
shasum -a 256 sample-eml-500kb.eml # macOS

On Windows, run Get-FileHash sample-eml-500kb.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 500 KB?: Yes. It is 512,000 bytes, which is 500 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 500 KB EML file?: A plain-text email message with standard headers and 1,531 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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