Reduce a PDF’s file size right in your browser, with no upload. The optimization happens on your own device, so your document stays private while you make it smaller for email or sharing.
Compress a PDF nowMost free online tools do this by uploading your file to their servers. This one doesn’t: it runs entirely in your browser, and the page ships with a strict security policy that blocks every outbound network request, so your file physically cannot leave your device. No account, no email, no upload, no watermark.
This is a lossless optimization: it removes unused data and metadata and compresses the PDF’s internal structure, so quality is untouched. It works best on text-heavy PDFs, which often shrink noticeably. PDFs made mostly of scanned images or photos won’t shrink much this way, because their size lives in the images themselves — and if a file can’t be made smaller, the original is kept so you never end up with a bigger file.
Because it’s lossless and privacy-first, it doesn’t re-compress images (which would reduce quality and require heavy processing). There are no watermarks and no limits, and it runs offline after the page loads.
No. Compression runs entirely in your browser and your file never leaves your device.
No. It’s a lossless optimization — it removes unused data and compresses the structure without touching image or text quality.
Image-heavy and scanned PDFs store most of their size in the images, which lossless compression can’t shrink much. Text-based PDFs compress best.
No. If compression wouldn’t help, the original is kept, so you never get a larger file.