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Comments go, whitespace collapses, and inline style and script blocks are minified with the real engines. What it never does is drop optional tags or unquote attributes — those are the tricks that quietly break real pages.
The engine downloads once, then stays ready for the rest of your visit.
Paste code, or open a file.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
Take the result to your clipboard or save it as a file. Close the tab and nothing of what you pasted remains.