01
JSON Formatter
Formats, indents and validates JSON with precise error positions, key sorting and a…
CSS Minifier
Minifies CSS by removing comments, whitespace and redundant syntax, reporting the exact bytes saved.
Developer
Nothing uploaded
No sign-up
Free, unlimited
Paste something on the left to see the result.
In short
CSS Minifier is a free online tool on inputtesthub.com that minifies CSS by removing comments, whitespace and redundant syntax, reporting the exact bytes saved. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the CSS Minifier
- Paste your code into the input area.
- Choose the indentation and output options you want.
- Read the formatted result, then copy or download it.
About the CSS Minifier
The CSS Minifier minifies CSS by removing comments, whitespace and redundant syntax, reporting the exact bytes saved. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Shipping a smaller stylesheet without a build step.
- Inlining critical CSS into the head.
- Checking how much whitespace a file carries.
Frequently asked questions
Does the CSS Minifier cost anything?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the page.
Does anything I enter leave my computer?
No. The CSS Minifier runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
When would I actually need the CSS Minifier?
In practice it gets used for three things: shipping a smaller stylesheet without a build step. Inlining critical CSS into the head. Checking how much whitespace a file carries. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Can I use the CSS Minifier on mobile?
Yes. The page is responsive and the page works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.
Related developer tools
All 9202
JSON Validator
Checks whether JSON is valid and reports the exact line, column and reason for the first error…
03
JSON Minifier
Strips all whitespace from JSON to produce the smallest valid output, showing the bytes saved.
04
JSON to CSV Converter
Converts a JSON array of objects into CSV, flattening nested keys and handling missing fields…
05
CSV to JSON Converter
Turns CSV or TSV into a JSON array of objects, with type detection for numbers and booleans.
06
JSON to XML Converter
Converts JSON into well-formed XML with a configurable root element and array item naming.
07
XML to JSON Converter
Parses XML and converts it to JSON, preserving attributes and handling repeated elements as…
08
JSON to YAML Converter
Converts JSON to clean YAML with correct indentation, quoting and multi-line string handling.
09
YAML to JSON Converter
Parses YAML and outputs equivalent JSON, with support for anchors, lists and nested maps.
10
JSON Escape and Unescape
Escapes a string for safe embedding inside JSON, and unescapes a JSON string back to plain text.