10 MB EML sample
An EML file of exactly 10,485,760 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 10 MB sample, test or dummy EML file.
Download
sample-eml-10mb.eml
10 MB10,485,760 bytes
Download 10 MB EMLCreated 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
6a5fa9f967774da84bf8e915b5c2a37f5ff193108b50173d76131b302bc213f3- 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 31,340 paragraphs wrapped at 72 characters. Lines of dashes at the end of the body bring the file to the exact size.
| Paragraphs | 31,340 |
|---|---|
| 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-10mb.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 10 MB matters
A 10,485,760-byte file: over the default limits of PHP, API Gateway and Spring Boot requests. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Amazon API Gateway | 10 MB payload | A 10 MB file in a multipart or base64 body is over the limit. |
| Spring Boot multipart | 10 MB per request by default (max-request-size) | Exceeded once form overhead is added. |
| PHP | 8 MB POST body by default (post_max_size) | Rejected before the script runs. |
| Amazon S3 multipart upload | 5 MiB minimum part size | This file splits into exactly two minimum-sized parts. |
| Email attachments | Commonly 20 to 25 MB per message | 10 MB fits, at about 13.3 MB once encoded. |
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.
Technical details
| File name | sample-eml-10mb.eml |
|---|---|
| Format | EML (Email message) |
| Extension | .eml |
| MIME type | message/rfc822 |
| Size | 10,485,760 bytes (10 MB) |
| Kind | Text |
| SHA-256 | 6a5fa9f967774da84bf8e915b5c2a37f5ff193108b50173d76131b302bc213f3 |
| 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-10mb.eml # Linux
shasum -a 256 sample-eml-10mb.eml # macOSOn Windows, run Get-FileHash sample-eml-10mb.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 10 MB?
- Yes. It is 10,485,760 bytes, which is 10 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 MB EML file?
- A plain-text email message with standard headers and 31,340 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.