Compress PDF
Reduce PDF file size online for free. Standard and aggressive compression modes — all processing in your browser, no upload.
Select a PDF to compress
Files stay in your browser — never uploaded
Standard re-saves with optimized streams. Aggressive rasterizes pages to JPEG for maximum size reduction (may reduce text quality).
How to Use
Step-by-step guide to get the most from this tool
- 1
Upload your PDF
Drag and drop or select a PDF file. Original file size is displayed.
- 2
Choose compression mode
Select Standard for quality preservation or Aggressive for maximum size reduction.
- 3
Compress and download
Click Compress & Download. See size reduction percentage before saving.
Features
What makes this tool stand out
Two modes
Standard stream optimization or aggressive JPEG rasterization.
Browser-only
Files processed locally — never uploaded.
Size comparison
See before/after file size and reduction percentage.
Instant
No queue, no email — download immediately.
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Frequently Asked Questions
Quick answers to common questions
How does PDF compression work?+
Standard mode re-saves your PDF with optimized object streams. Aggressive mode rasterizes each page to JPEG, significantly reducing file size but may affect text sharpness.
Is my PDF uploaded to a server?+
No. All compression happens in your browser using pdf-lib and pdf.js. Your files never leave your device.
Which compression mode should I use?+
Use Standard for documents with text you need to remain sharp. Use Aggressive for scanned PDFs or when maximum size reduction is needed.
Will compression affect PDF quality?+
Standard compression preserves original quality. Aggressive compression converts pages to images, which may make small text harder to read.
Is there a file size limit?+
There is no hard limit, but very large PDFs may be slow to process. For best performance, compress files under 50 MB.
Can I compress password-protected PDFs?+
Password-protected PDFs cannot be compressed. Remove the password first using a PDF unlock tool.
How much can I reduce PDF size?+
Results vary. Scanned PDFs often shrink 50-80% with aggressive mode. Text-heavy PDFs see smaller reductions with standard mode.
Is this tool free?+
Yes. Compress unlimited PDFs with no signup, watermarks, or page limits.