10 MB HTML sample

An HTML file of exactly 10,485,760 bytes. It is a valid HyperText Markup Language 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 HTML file.

sample-html-10mb.html

10 MB10,485,760 bytes

Download 10 MB HTML

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/html
SHA-256: 93cfb8ad371a5296a1b7efbe2062589815dc4da8320e04f24f5945a2ce65dcf8
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

A static HTML5 page with 13,014 sections of headings, paragraphs, lists and tables. It has no scripts, no external resources and a noindex robots tag. An HTML comment before the closing tags brings the file to the exact size.

Sections	13,014
Doctype	HTML5
Scripts	None
External resources	None
Styles	One inline style element
Encoding	UTF-8 (ASCII characters only)

How the file begins

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

00000000  3c 21 44 4f 43 54 59 50  45 20 68 74 6d 6c 3e 0a |<!DOCTYPE html>.|
00000010  3c 68 74 6d 6c 20 6c 61  6e 67 3d 22 65 6e 22 3e |<html lang="en">|
00000020  0a 3c 68 65 61 64 3e 0a  3c 6d 65 74 61 20 63 68 |.<head>.<meta ch|
00000030  61 72 73 65 74 3d 22 75  74 66 2d 38 22 3e 0a 3c |arset="utf-8">.<|

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 scrapers and HTML-to-text conversion
Testing HTML sanitisers and upload filters

Testing notes for HTML

Serve uploaded HTML with Content-Disposition: attachment or from a separate domain, and send X-Content-Type-Options: nosniff.
A text file that merely starts with a tag can be sniffed as HTML by older browsers if the Content-Type header is missing.

HTML format reference

Technical details

File name	sample-html-10mb.html
Format	HTML (HyperText Markup Language)
Extension	.html
MIME type	text/html
Size	10,485,760 bytes (10 MB)
Kind	Text
Signature	3C 21 44 4F 43 54 59 50 45
SHA-256	93cfb8ad371a5296a1b7efbe2062589815dc4da8320e04f24f5945a2ce65dcf8
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-html-10mb.html     # Linux
shasum -a 256 sample-html-10mb.html # macOS

On Windows, run Get-FileHash sample-html-10mb.html -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 HTML file?: A static HTML5 page with 13,014 sections of headings, paragraphs, lists and tables. It has no scripts, no external resources and a noindex robots tag. An HTML comment before the closing tags brings the file to the exact size.
Do the HTML samples run any scripts?: No. They are static documents with one small inline style block, no scripts and no external resources, and they are marked noindex.

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