CSS Minifier
CSS Minifier. Free, no signup, no watermark. Runs in your browser — your file never leaves your device.
How to css minifier
- Add your input — Paste or type into the box above. There is no length limit, because the work happens on your own machine rather than in a request to a server.
- Adjust the options — Where the tool offers settings, change them and the output updates immediately — there is nothing to submit.
- Copy the result — Use the copy button, or select the output and copy it by hand. Nothing is stored once you leave the page.
What this tool does
To use the CSS minifier, paste your text into the input box above. The converted result appears immediately in the output box, ready to copy. The tool is free, needs no account, applies no watermark, and has no daily limit.
What this tool does
Developers paste configuration files, API responses and database exports into tools like this all day, and those routinely contain live credentials, customer records and internal hostnames. Everything here is parsed and reformatted by JavaScript on your own machine. Nothing is transmitted, so nothing can be logged.
Why nothing is uploaded
This tool runs entirely on your own device. Your file is read into memory by JavaScript on this page, processed there, and handed back to you as a download. It is never transmitted to us, which means there is nothing on our side to store, log, leak or forget to delete.
You can verify that yourself: load this page, disconnect from the internet, and the tool still works. That is a different claim from a privacy policy promising prompt deletion, and it is the reason this site exists.
Validation, not just formatting
Where this tool parses your input it also validates it, and where it fails it tells you the line and column rather than just reporting that something is wrong. On a 2,000-line configuration file, that distinction is most of the value.
CSV parsing follows RFC 4180 properly: quoted fields may contain the delimiter, may span lines, and may contain doubled quotes. A naive split on commas breaks on any of those, which is why exported spreadsheets so often come out mangled. Numbers and booleans are converted to real types when converting to JSON, and anything ambiguous stays a string.
The minifiers are deliberately conservative. They strip comments and collapse
whitespace, but they never rename a variable or reorder a statement, because a
minifier that changes behaviour is worse than no minifier at all. Strings,
template literals and regular expressions are skipped, so a //
inside a URL is not mistaken for a comment.
What it costs
Nothing. There is no account, no email capture, no free-trial countdown, no watermark on the output and no daily limit. The site is funded by advertising, which sits below the tool and never between an input and its result.
Works offline
Because everything runs locally, this tool keeps working once the page has loaded even if your connection drops. That is worth knowing on a train, on conference WiFi, or anywhere the network is unreliable — and it is the clearest demonstration that your file really is not going anywhere.