100% Browser-Based • No Upload • Free

Free PDF Compressor Reduce Size, Keep Quality

Compress your PDF files by up to 80% — entirely in your browser. No file uploads, no server processing, no data stored. Works with scanned documents, image-heavy PDFs, and text-based files alike.

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No sign-up required to try • No files uploaded • Free forever

How It Works

1
Select or drop your file
2
Processed in your browser — nothing uploaded
3
Download the result — done!
Key Features

Why Use UniTrack PDF Compressor

Smaller files, faster emails, easier sharing — all without compromising privacy.

Up to 80% Smaller

Advanced image recompression and stream optimization reduces PDFs dramatically without visible quality loss.

Two Compression Modes

Choose "Compress Images" for maximum reduction or "Lossless Stream" for zero quality loss on text-heavy documents.

100% Private

Your PDF never leaves your device. Processing happens entirely in your browser using JavaScript. No server, no risk.

Your Data Never Leaves Your Browser

Unlike other online tools, we don't upload your files to our servers. Everything is processed using JavaScript directly in your browser. When you close the tab, your data is gone. Zero tracking, zero risk.

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Server uploads
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Data stored
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Tracking
FAQ

Frequently Asked Questions

Our compressor uses JavaScript libraries (pdf-lib and PDF.js) to process your PDF entirely in your browser. Images inside the PDF are recompressed to JPEG at optimal quality, and internal streams are optimized. No data ever leaves your device.

Results vary depending on content. Image-heavy PDFs (scanned documents, brochures) can shrink by 50-80%. Text-only PDFs may see 5-20% reduction with lossless stream optimization.

The "Lossless Stream" mode preserves 100% quality. The "Compress Images" mode applies visual compression to embedded images — text remains perfectly crisp and selectable. For most uses, the quality difference is imperceptible.

Since processing happens in your browser, the limit depends on your device's available memory. Most devices handle PDFs up to 100MB comfortably. There are no artificial limits imposed by UniTrack.

Compress Your PDFs for Free

Reduce PDF file size instantly — no upload, no signup, no limits. Part of UniTrack's 20+ free privacy-first tools.

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No sign-up required 100% browser-based Free forever