PDF Compress
Shrink PDF file size without uploading. 100% in your browser.
PDF File
Result
When to use this
- When your PDF exceeds an email attachment limit (10MB Gmail, 25MB Outlook)
- When uploading a resume to a job site that caps file size at 5MB
- When you need to share a confidential contract that can't be uploaded to a third-party server
- When sending PDFs over slow mobile data
What this tool does
Drop a PDF and choose a compression level. The tool re-renders each page locally in your browser, re-encodes images at lower quality, and rebuilds a smaller PDF. Your file is never uploaded — all processing happens on your device. Most effective on PDFs containing scanned pages, photos, or screenshots.
How to use
- 1Drag and drop or click to upload a PDF file
- 2Choose a compression level: High Quality, Balanced, or Maximum Compression
- 3Click Compress and wait while pages process locally
- 4Download the smaller PDF
Common use cases
Email attachments
Reduce a 25 MB PDF to under 10 MB so it fits Gmail, Outlook, or Slack attachment limits.
Job applications
Shrink your resume or portfolio PDF to meet the 2–5 MB upload caps on most job boards.
Confidential contracts
Compress contracts, NDAs, or legal documents without uploading them to a third-party server.
Mobile sharing
Send PDFs over slow connections by reducing file size before uploading to messaging apps.
Need to merge multiple PDFs first? Try PDF Merge.
Why use Doneio
- 100% private — your PDF never leaves your browser
- No watermark, no sign-up, no daily limit
- 3 compression presets — pick quality vs file size
- Works on PDFs with scanned pages and photos
- Free with no file size limit beyond your device
Frequently asked questions
Is my PDF uploaded to a server?
No. The compression runs entirely in your browser using pdf.js and pdf-lib. Your file never leaves your device.
How much smaller will my PDF be?
Typically 30–70% smaller depending on the level chosen. Scanned PDFs and image-heavy files compress the most. Text-only PDFs see smaller gains.
Will the compressed PDF still be searchable?
The compressed file becomes an image-based PDF, which means text inside pages is no longer selectable. If you need text selection, run OCR on the result first.
Is there a file size limit?
No hard limit. Performance depends on your device. Very large PDFs (200+ pages) may take a minute or two to process.
Why choose Maximum Compression?
Use it when you need the smallest possible file (e.g., email attachment under 10 MB). Visual quality drops slightly but stays readable.
Is this free?
Yes. No sign-up, no watermark, no daily limit. Open and use.