50 KB CSS sample

A CSS file of exactly 51,200 bytes. It is a valid Cascading Style Sheets file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 50 KB sample, test or dummy CSS file.

sample-css-50kb.css

50 KB51,200 bytes

Download 50 KB CSS

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/css
SHA-256: 87341a02932475e6259747a409d9c1a8c9a0036aaf9961317d101d34b36e6569
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

A custom property block, a body rule and 523 class rules with colours, margins, padding and border radii. A comment at the end brings the file to the exact size.

Rules	525
Custom properties	2
Imports	None
Encoding	UTF-8 (ASCII characters only)

How the file begins

The opening lines of sample-css-50kb.css, exactly as they appear in the file.

00000000  2f 2a 20 53 61 6d 70 6c  65 54 65 73 74 46 69 6c |/* SampleTestFil|
00000010  65 73 20 73 61 6d 70 6c  65 20 43 53 53 20 66 69 |es sample CSS fi|
00000020  6c 65 20 28 35 30 20 4b  42 29 20 2a 2f 0a 3a 72 |le (50 KB) */.:r|
00000030  6f 6f 74 20 7b 0a 20 20  2d 2d 69 6e 6b 3a 20 23 |oot {.  --ink: #|

Preview

Shows the file contents.

Where 50 KB matters

A 51,200-byte file, half of the default body limit in several web frameworks. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Express body parsers	100 KB by default	50 KB is accepted; 500 KB is rejected with 413 unless the limit is raised.
Base64 encoding	Adds 33 percent	50 KB becomes about 67 KB when embedded in JSON.

All 50 KB sample files

Use this file for

Checking thumbnail and icon handling
Testing code editors and syntax highlighters
Testing minifiers and bundlers

Testing notes for CSS

With X-Content-Type-Options: nosniff, browsers refuse a stylesheet that is not served as text/css.

CSS format reference

Technical details

File name	sample-css-50kb.css
Format	CSS (Cascading Style Sheets)
Extension	.css
MIME type	text/css
Size	51,200 bytes (50 KB)
Kind	Text
SHA-256	87341a02932475e6259747a409d9c1a8c9a0036aaf9961317d101d34b36e6569
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	Code

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-css-50kb.css     # Linux
shasum -a 256 sample-css-50kb.css # macOS

On Windows, run Get-FileHash sample-css-50kb.css -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 50 KB?: Yes. It is 51,200 bytes, which is 50 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 50 KB CSS file?: A custom property block, a body rule and 523 class rules with colours, margins, padding and border radii. A comment at the end brings the file to the exact size.
What do the sample stylesheets contain?: Custom properties, a body rule and a long list of class rules, with no @import rules or external URLs.

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