10 MB YAML sample

A YAML file of exactly 10,485,760 bytes. It is a valid YAML Ain't 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 YAML file.

sample-yaml-10mb.yaml

10 MB10,485,760 bytes

Download 10 MB YAML

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: application/yaml
SHA-256: 0d3441f9182c786d2f4b3a4ad16fb7bafe0e463d082fe419b74833274157e1c7
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

One YAML document with a "records" sequence of 43,023 mappings, each with strings, numbers, booleans, a date, a flow sequence and a nested mapping. Comment lines at the end bring the file to the exact size.

Records	43,023
Documents	1
YAML version	1.2 compatible
Indentation	2 spaces
Encoding	UTF-8 (ASCII characters only)

How the file begins

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

00000000  23 20 53 61 6d 70 6c 65  54 65 73 74 46 69 6c 65 |# SampleTestFile|
00000010  73 20 73 61 6d 70 6c 65  20 59 41 4d 4c 20 66 69 |s sample YAML fi|
00000020  6c 65 20 28 31 30 20 4d  42 29 0a 2d 2d 2d 0a 67 |le (10 MB).---.g|
00000030  65 6e 65 72 61 74 6f 72  3a 20 53 61 6d 70 6c 65 |enerator: Sample|

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 converters between YAML and JSON
Testing configuration loaders and linters

Testing notes for YAML

Unquoted values are typed by guesswork. In YAML 1.1 parsers the country code NO becomes false, and a version such as 1.10 becomes the number 1.1.
Loading untrusted YAML with a full loader can construct arbitrary objects in some libraries; always use the safe loader.

YAML format reference

Technical details

File name	sample-yaml-10mb.yaml
Format	YAML (YAML Ain't Markup Language)
Extension	.yaml
MIME type	application/yaml
Size	10,485,760 bytes (10 MB)
Kind	Text
SHA-256	0d3441f9182c786d2f4b3a4ad16fb7bafe0e463d082fe419b74833274157e1c7
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	Configuration

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

On Windows, run Get-FileHash sample-yaml-10mb.yaml -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 YAML file?: One YAML document with a "records" sequence of 43,023 mappings, each with strings, numbers, booleans, a date, a flow sequence and a nested mapping. Comment lines at the end bring the file to the exact size.
Are the samples a single YAML document?: Yes. Each file is one document with a top-level mapping and a sequence of records.

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