Compress PDF
Reduce PDF file size without uploading to any server. Your file never leaves your browser.
Drop your PDF here
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One file at a time · Max 50 MB
Common questions
How much can you reduce a PDF file size?
Typically 40–80% depending on the content. Image-heavy PDFs compress the most. Text-only PDFs compress less but still benefit from metadata removal.
Will compression reduce my PDF quality?
The 'Balanced' preset (150 DPI) is indistinguishable from the original on screen and is suitable for most uses. Choose 'High Quality' (300 DPI) if you need print-ready output.
Is it safe to compress PDFs online here?
Yes — uniquely so. Your file is processed entirely in your browser using Ghostscript WebAssembly. It never leaves your device. You can verify this by opening your browser's Network tab.
What is the maximum file size?
Up to 50 MB per file. Processing happens in your browser's memory, so very large files may be slow on older devices.
What's the difference between the three quality presets?
Small (72 DPI) gives the smallest file size, ideal for screen viewing and email. Balanced (150 DPI) is the best trade-off for most uses. High Quality (300 DPI) preserves full detail for printing.
Why compress a PDF without uploading?
Most PDF compressors upload your file to a cloud server where it is processed and — often — retained for hours or days. For documents containing contracts, medical records, financial statements, or personal information, this is a significant privacy risk. LocalDF runs entirely in your browser. The compression engine (Ghostscript, compiled to WebAssembly) executes locally, meaning your file never leaves your device.