10 MB Markdown sample

A Markdown file of exactly 10,485,760 bytes. It is a valid Markdown 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 Markdown file.

sample-md-10mb.md

10 MB10,485,760 bytes

Download 10 MB Markdown

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: text/markdown
SHA-256: 33178a25a3f15e8f5b5b9de0ab72e0607e7c683ea3bf07825812ef27602e2f2b
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

26,768 sections with headings, paragraphs, bulleted and numbered lists, block quotes, fenced code blocks and tables. An HTML comment at the end brings the file to the exact size.

Sections	26,768
Flavour	CommonMark, with GitHub-style tables
Elements	Headings, emphasis, lists, links, quotes, code blocks, tables
Encoding	UTF-8 (ASCII characters only)
Line endings	LF

How the file begins

The opening lines of sample-md-10mb.md, exactly as they appear in the file.

00000000  23 20 53 61 6d 70 6c 65  20 4d 61 72 6b 64 6f 77 |# Sample Markdow|
00000010  6e 20 66 69 6c 65 20 28  31 30 20 4d 42 29 0a 0a |n file (10 MB)..|
00000020  41 20 43 6f 6d 6d 6f 6e  4d 61 72 6b 20 64 6f 63 |A CommonMark doc|
00000030  75 6d 65 6e 74 20 66 6f  72 20 74 65 73 74 69 6e |ument for testin|

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.

All 10 MB sample files

Use this file for

Finding the first upload limit in a new stack
Testing documentation pipelines
Testing Markdown renderers and editors

Testing notes for Markdown

Markdown may contain raw HTML, so anything that renders user-supplied Markdown needs an HTML sanitiser.
Tables are an extension rather than part of CommonMark, so renderers differ on whether they appear.

Markdown format reference

Technical details

File name	sample-md-10mb.md
Format	Markdown (Markdown)
Extension	.md
MIME type	text/markdown
Size	10,485,760 bytes (10 MB)
Kind	Text
SHA-256	33178a25a3f15e8f5b5b9de0ab72e0607e7c683ea3bf07825812ef27602e2f2b
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	Documents

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-md-10mb.md     # Linux
shasum -a 256 sample-md-10mb.md # macOS

On Windows, run Get-FileHash sample-md-10mb.md -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 Markdown file?: 26,768 sections with headings, paragraphs, bulleted and numbered lists, block quotes, fenced code blocks and tables. An HTML comment at the end brings the file to the exact size.
Which Markdown features do the samples use?: Headings, emphasis, ordered and unordered lists, links, a pipe table, a fenced code block and a block quote.

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