Reduce PDF file size directly in your browser. Fast, unlimited, and 100% private — your documents never leave your computer or phone.
Your files are never uploaded to our servers — all compression happens right inside your browser
or pick several files at once from your device
Unlike traditional online PDF compressors that upload your sensitive documents to cloud servers, Kompres PDF executes all compression tasks directly inside your web browser. Utilizing modern WebAssembly and HTML5 Canvas technology, your files are processed entirely in local memory.
Pick between High Quality (retains maximum visual sharpness for presentations and legal files), Balanced (the ideal tradeoff for email attachments and office documents), or Smallest Size (aggressive downsampling to meet strict upload ceilings).
Add multiple PDF documents simultaneously. Compare original vs. compressed sizes, review exact byte savings, and download each file individually or bundle everything into a single organized ZIP archive.
There are no paywalls, subscriptions, email registration forms, or watermarks added to your pages. The tool is free for unlimited document compressions on desktop, tablet, and mobile browsers.
Yes. Kompres PDF is 100% free to use with no hidden fees, subscriptions, or daily limits. All compression happens client-side in your browser.
No. Your PDF files never leave your device. The entire compression process takes place locally using modern web APIs in your browser.
Select High Quality when documents contain intricate vector schematics or fine text. Choose Balanced for everyday office documents and email attachments. Use Smallest Size when meeting strict portal upload caps.
Yes. You can drag and drop multiple PDF files at once, compress them in one batch, and download all compressed files together in a ZIP file.