How to use this tool
- Choose an image-heavy PDF.
- Set DPI and JPEG quality.
- Compress and review the before-and-after sizes.
Optimize PDF
Advanced PDF Compressor
HugPDF compresses PDF files locally in the browser with adjustable DPI and JPEG quality. Files are never uploaded to a server for compression; pages are rebuilt as images, so searchable text and interactive elements can be lost. The tool returns the original when the new file is not smaller.
HugPDF — free PDF tools that run in your browser. No uploads, no account, no watermark.
- ✓Local processing
- ✓No sign-up
- ✓Files never uploaded
Local processing
Compress PDF Pro
No sign-upFiles never uploaded
Drop files here or choose from your deviceUp to 300 MB per file. Large files work best on a computer; available memory may limit processing.
Selected files
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Your result
Fine-tune resolution and image quality
DPI controls rendered page resolution; JPEG quality controls image compression. Begin with moderate settings and change one control at a time, checking small text after each run.
Use the standard compressor for presets or Focus for higher-quality selected regions. Advanced compression creates image-based pages and cannot promise a target size or preserve digital signatures.
For an email attachment, compare the resulting size with the recipient limit before sending. For printing, inspect small lettering at the intended print size. If the source is already compact, compression may not help; the tool returns the original when the new file is not smaller.
What this tool does
Set output DPI and JPEG quality directly. A live estimate explains the trade-off, and the original is returned if the new file is not smaller.
Your files stay with youDocument processing runs locally in your browser. We do not receive, store or inspect the files you select.
Adjust resolution and quality deliberately
Start from a copy and try 120 DPI with JPEG quality 70 for an ordinary scan. This is a suggested starting point, not a setting suitable for every document. Increase resolution if letters become unclear; reduce JPEG quality slightly if images remain too large, then check again.
Inspect the output at 200%, especially account numbers and stamps. Higher resolution costs more memory and processing time. When the tool retains your original, its rebuilt candidate was not smaller. Read the measured example and quality checks.
FAQ
Frequently asked questions
Which settings should I start with?
150 DPI and 70% JPEG quality are a practical balance for screen use.