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Home›PDF Tools›PDF Compressor
📄 PDF Tool

PDF Compressor Online Free

Reduce PDF file size instantly in your browser. Strip metadata, compress content streams, and re-optimise structure. No upload to any server — 100% private.

⚙️ Powered by pdf-lib.js — a free open-source PDF library. Loads once from CDN on first use.
Compression Level
Strips metadata & optimises structure. Best balance of size reduction and quality preservation.
Options
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Drop PDF file here or click to browse
PDF files only · Max 50MB
Processing…
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Original Size
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Compressed Size
Saved 0%

About PDF Compressor

This free online PDF compressor reduces your PDF file size by stripping unnecessary metadata, optimising content streams, and removing redundant objects — all without re-encoding images. Unlike server-based tools, your PDF never leaves your device.

What gets removed: Author name, software info, creation date, modification date, comments and annotations (optional), and redundant whitespace in content streams.

Limitations: Browser-based compression works best on PDFs with large metadata overhead. PDFs that already have compressed image streams will see modest size reductions. For maximum image compression, consider re-printing to PDF from the source document.

Updated: May 2025 · Works on Chrome, Firefox, Safari, Edge · Mobile friendly

Frequently Asked Questions

How much will my PDF be compressed?+
Results vary by PDF type. Text-heavy PDFs with lots of metadata can shrink by 20-40%. Scanned PDFs or PDFs with already-compressed images may only reduce by 5-15%.
Will compression affect PDF quality?+
No. This tool only removes metadata and optimises the PDF structure — it does not re-encode or degrade images, text, or fonts in any way.
Is there a file size limit?+
Up to 50MB. Very large PDFs may take 10-30 seconds to process depending on your device speed.
Is my PDF uploaded to any server?+
No. All compression happens entirely in your browser using pdf-lib.js. Your PDF never leaves your device.
Why is the compressed file the same size or larger?+
If your PDF was already optimised (e.g. exported from Adobe Acrobat Pro), there's little metadata overhead to remove. The file may be marginally larger due to re-serialisation overhead.

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✅Done!