Compress a PDF
Pick how small and get the file back with both sizes shown. A PDF that is mostly text will barely shrink — that is compression working correctly, not the tool failing, and it says so rather than claiming a saving it did not make.
Make a PDF smaller
Free, no signup, no credit charged. This one sends your file to the server, because the browser cannot do it. Nothing is kept: the file is processed in memory and deleted before the response finishes.
The size cap here is lower than the API’s, because this is uncharged server time. Larger files, or a lot of them, cost one credit each — through the API, or on the run screen with no code at all.
This is one of two tools here that uploads your file. Compression re-encodes every image stream, which needs Ghostscript, and no browser library does it. The file is processed in memory and deleted before the response finishes.