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Compress PDF — Reduce PDF File Size Online

Select PDF file to compress

or click to choose a file from your device (up to 50 MB — never uploaded)

Compress PDF — Reduce PDF File Size Online — Free, 100% Private Browser Tool

Shrink large PDF files to meet email attachment limits, upload forms or storage quotas with this free online PDF compressor. Choose one of four compression levels — from light (highest quality) to extreme (smallest file) — and see the original and compressed sizes side by side before the file downloads. Everything is processed locally in your browser: your PDF is never uploaded to a server, files up to 50 MB are free, and a live progress counter shows exactly where the job is.

The compressor re-encodes each page at the quality level you pick, which works especially well for scanned documents, image-heavy reports, presentations and signed forms. If a text-based PDF is already fully optimized, the tool tells you honestly and keeps your original file instead of delivering a bigger result — you never lose data.

Frequently Asked Questions

How do I reduce the size of a PDF file?

Select your PDF, pick a compression level (Balanced is a good default) and press Compress. The optimized file downloads automatically with a report of the original and new sizes.

Is my PDF uploaded to a server during compression?

No. Compression runs entirely inside your browser. The file is read locally, processed on your device and saved straight back to your disk.

Will the compression reduce the quality of my document?

Light and Balanced levels keep pages looking excellent in everyday use. Strong and Extreme produce much smaller files by lowering image detail — ideal when file size matters more than fine detail. If no smaller result is possible, your original file is kept unchanged.

Which compression level should I choose?

Use Light for print-quality archives, Balanced for email and everyday sharing, Strong or Extreme when an upload portal has a strict size limit.

What is the maximum file size?

You can compress PDF files up to 50 MB per file, free and without sign-up.