Compress PDF Online
Reduce PDF file size by up to 80% — instantly, free, and without uploading your file.
✓ Free · No signup · Works in browser · 100% private
Drag your PDF here or click to select
Maximum file size: 100 MB · Processed locally in your browser
Compression level
Why use this tool
Fast, Private & Free PDF Compression
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100% Private
Your PDF never leaves your device. All processing happens locally in your browser.
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Instant Results
Compression starts immediately — no waiting for uploads or server processing.
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3 Quality Levels
Choose Low, Medium or High to balance file size vs. visual quality.
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Works Everywhere
Mobile, tablet or desktop — any modern browser works without installing anything.
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Completely Free
No subscription, no signup, no watermarks — unlimited use for free.
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Size Comparison
See exactly how much space you saved — before and after, in MB and percentage.
How it works
Compress a PDF in 3 Simple Steps
1
Upload your PDF
Drag and drop your PDF file into the tool above, or click to browse. Supports files up to 100 MB.
2
Choose compression level
Select Low (maximum compression), Medium (balanced), or High (best quality). Medium works best for most documents.
3
Download your compressed PDF
Click "Compress & Download". The compressed file downloads automatically with a size comparison report.
FAQ
Frequently Asked Questions
How much can I reduce my PDF file size?
Depending on content, you can reduce PDF size by 30–80%. PDFs with many embedded images compress the most. Text-only PDFs may see 10–30% reduction. Use the Low quality setting for the smallest possible file size.
Is my PDF uploaded to any server?
No. Your PDF is processed entirely in your browser using JavaScript (PDF.js + PDF-lib). Nothing is ever sent to our servers — your documents stay completely private on your device.
Will compression reduce text quality or readability?
Compression converts PDF pages to JPEG images, so text becomes part of an image. At normal zoom (100%) it looks fine. If you need fully searchable text, use the High quality setting which preserves more detail.
What is the maximum file size I can compress?
The tool handles PDFs up to 100 MB. For very large files, your browser may need a few seconds to process each page. Large PDFs with 100+ pages will still work, just allow a moment for processing.
Can I compress a password-protected PDF?
Currently the compressor works on unprotected PDFs. To compress a protected PDF, first use our Decrypt PDF tool to remove the password, then compress it.
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