Compress PDF online (no upload)
Reduce PDF file size locally in your browser. No signup. No uploads.
Compress PDF to reduce file size when email attachments bounce or portals reject uploads.
Upload your PDF, choose a compression level (Light, Balanced, or Strong), and download the result.
All processing happens in your browser—files are not uploaded to a server, and they're not stored.
Ideal for reducing scan-heavy documents, photo-based PDFs, or files that exceed 2–10 MB email/portal limits.
Some PDFs are already optimized, and in those cases, dokzen will recommend keeping the original.
How it works
1. Upload PDF
Select a PDF file from your device.
2. Choose level
Pick Light, Balanced, or Strong compression.
3. Download
Get the compressed PDF instantly.
Drop your PDF here
PDF files only. Large PDFs may take longer to process.
How compression works
dokzen first tries safe optimizations (like rebuilding the PDF structure and removing optional metadata).
Some PDFs are already efficient, and some require heavy processing that can reduce quality. When meaningful compression isn’t possible safely, dokzen recommends the original.
Use cases
- Reduce PDF size for email attachment limits
- Shrink scanned PDFs before sharing
- Speed up uploads to portals and forms
- Remove optional metadata where possible
Reading
Want more detail? These explain what to expect.
FAQ
Is it safe to compress PDFs online?
It depends on the site. dokzen compresses locally in your browser (no upload).
It depends on the site. dokzen compresses locally in your browser (no upload).
Will compression always reduce file size?
No. Some PDFs are already optimized. If meaningful savings aren’t possible safely, dokzen recommends the original.
No. Some PDFs are already optimized. If meaningful savings aren’t possible safely, dokzen recommends the original.
Will compressing reduce quality?
It can. Light/Balanced aim to preserve quality; Strong compression can reduce quality, especially for images and scans.
It can. Light/Balanced aim to preserve quality; Strong compression can reduce quality, especially for images and scans.
Are my PDFs uploaded or stored?
No — compression happens locally in your browser.
No — compression happens locally in your browser.
How do I reduce a PDF for email attachments?
Try Balanced or Strong, and if the PDF is scan-heavy, use Strong. If it still won’t shrink, reduce images or split the file.
Try Balanced or Strong, and if the PDF is scan-heavy, use Strong. If it still won’t shrink, reduce images or split the file.