Compress PDF Online — Free, Private
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Supports: PDF
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.
100% Private — No Upload Required
Every PDF you compress stays on your device. Vizua processes files entirely in your browser using modern browser technologies — no network requests, no server. Works offline too — disconnect from the internet and the tool keeps working perfectly.
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?
The compressed PDF contains rendered page images. For best results with text-heavy documents, use a higher quality setting (80%+) to keep text crisp and readable.
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?
Since everything runs in your browser, very large PDFs (50+ pages) may take longer to process. There is no hard limit — it depends on your device memory.
Is my PDF uploaded to a server?
No. Vizua compresses PDFs entirely in your browser. Your files never leave your device — 100% private.