PDF Tools
All tools, free, in your browser.
Compress PDF Free Online
Reduce PDF file size without losing quality. Three compression levels. Perfect for email attachments and web uploads.
How to compress a PDF online
- Upload your PDF by clicking Choose File or dragging it into the drop zone.
- Select a compression level: Low (smallest file), Medium (balanced), or High (best quality).
- Click Compress PDF — the reduced file downloads to your device in seconds.
When to compress a PDF
Large PDFs cause problems: email attachments get rejected, uploads to portals time out, and file storage fills up fast. Compress a PDF before emailing a presentation, uploading a portfolio, attaching a contract, or sharing a scanned document. VoxScan can reduce file size by up to 90% while keeping text crisp and readable.
Frequently asked questions
- How much can VoxScan compress a PDF?
Typically 40–90% reduction depending on content. PDFs heavy with high-resolution images compress the most. Text-only PDFs compress less but still meaningfully.
- Will compression affect text quality?
No. Text and vector elements are preserved losslessly. Only embedded images are resampled, and only when you choose Medium or Low quality.
- Is there a file size limit for compression?
No file size limit. Processing runs locally in your browser — no upload, no server, no limit.