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PDF Compressor Online Free

Reduce PDF size 60–80% · No Upload · 100% Browser-Side · Bulk 5 PDFs

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Drop PDF files here or click to browse

PDF only · Up to 5 files · Max 50 MB each · 100% private

How to Compress PDF Online Free

Upload PDF

Drop up to 5 PDF files — no server upload, 100% browser processing

Choose Level

Lossless for print, Balanced for email, Maximum for smallest size

Download

Compressed PDF ready instantly. Bulk files download as ZIP.

Frequently Asked Questions

How much can this tool compress a PDF?

Results vary by content. Text-heavy PDFs typically compress 10–30% (Lossless mode). PDFs with embedded images can achieve 60–80% reduction using Maximum compression. A scanned 10 MB PDF can often be reduced to under 2 MB.

Is it safe to upload confidential PDFs?

Your PDFs never leave your device. All compression runs entirely in your browser using pdf-lib — no server, no upload, complete privacy.

What is the difference between Lossless and Maximum compression?

Lossless only strips metadata and optimizes structure — zero quality change, best for legal or print documents. Maximum removes all optional data, recompresses images, and applies grayscale — best for sharing or email attachments.

Can I compress a password-protected PDF?

Yes. Enter the PDF password in the password field that appears after upload. The tool will use it to unlock and compress the PDF.

Why is my compressed PDF larger than the original?

This rarely happens with already-optimized PDFs. If your PDF was compressed by another tool, re-compressing may not reduce size further. Try switching to Lossless mode in this case.