Reduce file size while keeping the best possible quality — all in your browser, without sending your PDF anywhere.
Everything is processed in your browser — the PDF never leaves your computer. In "Optimize images" mode, each image is only replaced if the result is actually smaller than the original.
Choose the document whose file size you want to reduce.
Choose between lighter compression (keeps more quality) or stronger compression (reduces size more), mainly by resampling embedded images.
See how much the size was reduced before downloading the compressed PDF.
No, the text itself always stays sharp — compression works mainly on the images embedded in the PDF, which are the main cause of large files.
It depends a lot on the content: a PDF with lots of high-resolution photos can shrink considerably, while a PDF made up mostly of text will shrink less — the tool shows the before/after size so you can decide.
Yes, there's usually a lighter level that focuses only on cleaning up the PDF's internal structure, without aggressively resampling images.
No. All processing happens inside your own browser — the file never leaves your computer or passes through any external server. You can confirm this by disconnecting from the internet once the page has loaded: the tool keeps working normally.
No. PDFsy doesn't ask for sign-up, an account or payment — just open the page and use the tool.
Yes. PDFsy offers PDF tools equivalent to iLovePDF's — merge, convert, compress, protect and much more — available in 25 languages, with no usage limits, no need to create an account, and 100% local processing in your browser, without uploading any file to any server.