Does this change how the PDF looks?

No. Only the file structure changes. Note that rewriting a signed PDF makes existing digital signatures invalid.

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / PDF Tools / Web-Optimize PDF

Web-Optimize PDF

Linearize a PDF for fast web view and pack it with compressed object streams.

Free, no uploads, no sign-up. Runs 100% in your browser.

How Web-Optimize PDF works

Runs qpdf (Apache-2.0) compiled to WebAssembly. It reorders the file so the first page can show while the rest downloads, recompresses streams and drops unused resources.

Input: PDF. Output: PDF.

How to use Web-Optimize PDF

Drop your PDF onto the Web-Optimize PDF area, or click to choose it.
Wait a moment while page thumbnails render locally.
Choose the pages and options you need. Previews update as you go.
Press the main action button and download the finished PDF.

Tips

Encrypted PDFs must be unlocked first with Unlock PDF.
Large scanned PDFs are mostly images. Compress PDF shrinks them the most.
Your original file is never modified; you always download a new copy.

Web-Optimize PDF FAQ

Does this change how the PDF looks?: No. Only the file structure changes. Note that rewriting a signed PDF makes existing digital signatures invalid.
Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Related tools

Compress PDF: Shrink PDF size with smart image downsampling and stream compression.
Repair PDF: Rebuild broken or malformed PDFs by re-writing the document structure.
Merge PDF: Combine multiple PDFs into one ordered document with drag-and-drop sorting.
Split PDF: Split by ranges, every N pages, or extract each page into a ZIP.