Compress PDF online — free and private

Reduce PDF file size in your browser: downsample images at a chosen DPI, strip metadata, and Flate-compress the structure. Private, no uploads.

Compress PDF files directly in your browser to reduce their size for email, uploads, and faster sharing. Choose between lossless optimization that keeps text selectable, or aggressive rasterization that downsamples images at a custom DPI for the smallest possible file.

Unlike most online PDF compressors, your documents are never uploaded to a server. Everything runs locally on your device using WebAssembly and the Canvas API, so even confidential contracts, invoices, and scanned files stay completely private.

• Two modes: lossless optimize (keeps text) and rasterize (maximum compression)
• Adjustable image resolution (72–300 DPI) and JPEG quality
• Strip metadata such as author, title, and producer
• Flate compression with object streams to shrink the file structure
• 100% client-side — no uploads, no sign-up, no watermarks

Frequently asked questions

How do I compress a PDF for free?

Drop your PDF into the tool, pick a compression mode and image quality, then click Compress PDF and download the smaller file. It is completely free with no watermark or page limit.

Is it safe to compress confidential PDFs here?

Yes. The file is processed entirely in your browser and is never sent to any server, which makes it safe for sensitive or confidential documents.

How much can I reduce a PDF's size?

Image-heavy and scanned PDFs can shrink by 70–90% using Rasterize mode at a lower DPI. Text-only PDFs see smaller gains because there is little to compress.

Will compressing reduce the quality of my PDF?

Lossless Optimize mode keeps text and vectors sharp. Rasterize mode trades some image quality for a much smaller file, and you control the DPI and JPEG quality.

Does it work offline?

Yes. Once the page has loaded, compression runs locally and continues to work even without an internet connection.