SampleTestFiles

25 KB EML sample

An EML file of exactly 25,600 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 25 KB sample, test or dummy EML file.

Download

sample-eml-25kb.eml

25 KB25,600 bytes

Download 25 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
105cf665e3364119d01afb216e5609fa1a4b75ad263a0d4ddc10642f33334778
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 76 paragraphs wrapped at 72 characters. Lines of dashes at the end of the body bring the file to the exact size.

Paragraphs76
Content typetext/plain, 7bit
AttachmentsNone
Line endingsCRLF (RFC 5322)
EncodingUTF-8 (ASCII characters only)

How the file begins

The opening lines of sample-eml-25kb.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

Shows the file contents.

Where 25 KB matters

A 25,600-byte file: the size of a small web image or a short document. These are the default limits a file of this size is useful for testing:

SystemLimitNote
TCP initial congestion windowAbout 14.6 KB (10 segments)25 KB needs at least two flights of packets on a new connection.
Base64 encodingAdds 33 percentA 25 KB file becomes about 34 KB inside JSON or an email.

All 25 KB sample files

Use this file for

  • Checking thumbnail and icon handling
  • 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 namesample-eml-25kb.eml
FormatEML (Email message)
Extension.eml
MIME typemessage/rfc822
Size25,600 bytes (25 KB)
KindText
SHA-256105cf665e3364119d01afb216e5609fa1a4b75ad263a0d4ddc10642f33334778
Created2026-10-23
ValidationSee 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.
PreviewAvailable on this page
SourceGenerated in your browser by this site's generator; not copied from elsewhere
LicenceFree to use, modify and redistribute (terms)
CategoryEmail & 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-25kb.eml     # Linux
shasum -a 256 sample-eml-25kb.eml # macOS

On Windows, run Get-FileHash sample-eml-25kb.eml -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.

Related files

Other EML sizes

Other 25 KB files

Use cases

Guides

Questions about this file

Is this file exactly 25 KB?
Yes. It is 25,600 bytes, which is 25 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 25 KB EML file?
A plain-text email message with standard headers and 76 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.