Compress PDF Online — Free, Private
Private by design — local browser processing
Drop images here
or click to browse
Supports: PDF
Compression rasterizes each page. Selectable text, links, forms, signatures, and layers may be lost; size reduction varies. Password-protected files prompt for a password.
How to Compress PDF File Size
Vizua is a free online PDF compressor that runs entirely in your browser. Unlike cloud-based services, your files are never uploaded to any server — everything is processed locally using advanced document processing technologies.
To compress a PDF, drop your file into the area above and adjust the quality slider. Our engine renders each page and re-encodes it at your chosen quality level, achieving significant size reductions while keeping documents readable.
Why Compress PDF Files?
- Email attachments — most email providers cap attachments at 25 MB. Compress large PDFs to fit within limits
- Faster uploads — compressed PDFs upload faster to forms, portals, and cloud storage
- Save storage — reduce the size of scanned documents and image-heavy PDFs
- Web publishing — smaller PDFs load faster when embedded on websites
How PDF Compression Works
Vizua renders each page of your PDF at the selected resolution, then re-encodes it as a JPEG image at your chosen quality level. The pages are reassembled into a new, smaller PDF. This approach is especially effective for scanned documents and image-heavy PDFs, where the bulk of file size comes from embedded images.
Local PDF Processing
The selected PDF is rendered and rebuilt on your device rather than uploaded to an image-processing server. The site still makes ordinary requests for its code, worker assets, analytics, advertising, and error monitoring as described in the privacy policy.
Frequently Asked Questions
How does PDF compression work?
Vizua renders each page of your PDF and re-encodes the images at a lower quality setting. This significantly reduces file size while maintaining readable text and clear visuals.
Will text remain selectable after compression?
No. The compressed PDF contains rendered page images, so text is no longer selectable. Links, forms, signatures, layers, and other interactive structure may also be lost.
What quality setting should I use?
For documents with photos, 50-60% works well. For text documents, use 75-90% to keep text sharp. The preview shows the file size so you can find the right balance.
Is there a file size limit?
Each PDF can be up to 50 MB. Large or complex PDFs may take longer, and practical processing capacity depends on your browser memory and device.
Is my PDF uploaded to a server?
No. The selected PDF is processed on your device rather than uploaded to an image-processing server. Normal site, CDN, analytics, advertising, and error-monitoring traffic is described in the privacy policy.