About PDF Compressor
Reduce the file size of a PDF right in your browser — nothing is uploaded. It re-renders each page and re-encodes it at your chosen quality, which is especially effective for scanned and image-heavy PDFs.
How to Use
- Choose your PDF file.
- Pick a compression level (Strong, Recommended, or Light).
- The tool processes each page locally.
- Download the smaller PDF.
Why Use This Tool?
- Accurate — built on precise, well-tested mathematical formulas.
- Instant — all calculations happen client-side for zero latency.
- Private — no data is sent to any server; your information stays on your device.
- Free — no sign-up, no limits, no hidden costs.
Frequently Asked Questions
How can a PDF be compressed without uploading it?
The whole process runs in your browser: each page is rendered and re-encoded at a lower quality using JavaScript, so your document never leaves your device — safe for confidential files.
Which PDFs compress the most?
Scanned documents and image-heavy PDFs shrink the most, often by 70–90%. Text-only PDFs are usually already small, so there is less to gain.
Will compressing reduce the quality?
Because pages are re-rendered as images, selectable text is flattened and a lower quality level reduces sharpness. Use 'Light' to keep more detail, or the original for text-only PDFs.