1 KB CSS sample file

A CSS file of exactly 1,024 bytes. It is a valid Cascading Style Sheets file, generated for this site and checked with an independent parser.

sample-css-1kb.css

1 KB1,024 bytes

Download 1 KB CSS

Direct download. No sign-up and no waiting.

Type: text/css
SHA-256: c4984e6518124fba15735ae6d7a187663c0b26ba8f191d1bef5d93cf49d74e57
Direct URL: https://sampletestfiles.com/downloads/css/sample-css-1kb.css

What is in this file

A :root block with custom properties, a body rule and 8 class rules. A closing comment brings the stylesheet to the exact size.

Rules	10
Features	Custom properties, class selectors, rem and px units
Encoding	UTF-8 (ASCII characters only)

How the file begins

The opening lines of sample-css-1kb.css, exactly as they appear in the file.

/* SampleTestFiles sample CSS file (1 KB) */
:root {
  --ink: #16202b;
  --paper: #fafbfc;
}

body {
  color: var(--ink);
  background: var(--paper);
  font-family: system-ui, sans-serif;
}

.sample-1 {
  color: #d64933;

Preview

Shows the file contents.

Where 1 KB matters

The smallest practical test file: 1,024 bytes, small enough to travel in a single network packet. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Ethernet	1,500 bytes (typical MTU)	A 1 KB payload fits in one packet with its headers.
Browser cookies	4,096 bytes per cookie	1 KB is well inside the limit; the 5 KB sample is over it.

All 1 KB sample files

Use this file for

Smoke tests in CI that must run in milliseconds
Testing minifiers and bundlers
Checking asset pipelines and caching

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-1kb.css
Format	CSS (Cascading Style Sheets)
Extension	.css
MIME type	text/css
Size	1,024 bytes (1 KB)
Kind	Text
SHA-256	c4984e6518124fba15735ae6d7a187663c0b26ba8f191d1bef5d93cf49d74e57
Created	2026-10-10
Validation	Exact size, signature bytes and structure checked when the file was generated
Preview	Available on this page
Source	Generated for this site; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Code

Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-css-1kb.css 'https://sampletestfiles.com/downloads/css/sample-css-1kb.css'
sha256sum sample-css-1kb.css     # Linux
shasum -a 256 sample-css-1kb.css # macOS

On Windows, run Get-FileHash sample-css-1kb.css -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

Related files

Questions about this file

Is this file exactly 1 KB?: Yes. It is 1,024 bytes, which is 1 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 1 KB CSS file?: A :root block with custom properties, a body rule and 8 class rules. A closing comment brings the stylesheet 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.

Download