How to Compress a PDF Without Uploading (Private & Free)
Learn how to compress PDF files entirely in your browser — no upload, no account, no watermark. Verify privacy with DevTools.
Why on-device compression matters
Most PDF compressors upload your files to their servers. FileKit runs pdf-lib and optimization entirely in your browser using Web Workers. Your document never leaves your device.
Steps to compress privately
1. Open FileKit PDF Compress. 2. Drop your PDF. 3. Choose compression level. 4. Download the result. 5. Open DevTools → Network tab — you'll see zero file uploads.
Tips for smaller files
If you need a specific size (e.g. 100KB for an upload portal), try our Compress PDF to 100KB preset. For scanned PDFs, consider converting pages to compressed images first.
Try these tools
FileKit — private file tools on your device.