Reduce your PDF file size instantly without uploading to any server. High-quality compression handled entirely within your browser for total privacy.
Drag & Drop PDF to Shrink
or click to browse local files
Your PDF is rendered into images inside your browser's memory using PDF.js.
Pages are re-encoded with optimized quality levels to reduce weight significantly.
A new, lightweight PDF is generated and downloaded to your device instantly.
Large PDF files are a common hurdle in modern digital workflows. Whether you're applying for a job, submitting legal documents, or sharing a portfolio, file size limits on email servers and government portals can be frustrating. Our Free PDF Compressor is designed to solve this problem by significantly reducing document weight.
OneDoc utilizes advanced client-side libraries to perform compression directly on your machine. This means your sensitive documents never travel across the internet, providing a layer of security that traditional "cloud-based" compressors cannot offer.
Our 'Recommended' setting balances file size and quality. It optimizes the internal structure without significantly degrading image resolution. For high-res photos, use the 'Low' compression setting.
The limit depends on your device's RAM, as all processing is local. Most modern computers can handle PDFs up to 100MB without any issues.