Compress a PDF
Pick a quality level and get a smaller file, with the before and after size shown. If it barely shrinks, the page tells you that instead of pretending.
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.