Reduce PDF file size while maintaining quality.
Your PDF never leaves your device. All compression happens locally in your browser using pdf-lib. Select a file, click compress, and download the smaller version — no uploads, no servers, no privacy risks.
Free users limited to 10MB files. Upgrade for 100MB, batch & no wait
Our free compress PDF tool lets you reduce PDF file size without sacrificing quality, making it easy to email documents or upload to websites. The compression works entirely in your browser using pdf-lib, which removes redundant data and optimizes object streams for maximum efficiency. You can achieve significant compression ratios depending on your file's content — images, fonts, and embedded elements all compress differently. For best results, compress PDF online free before sharing large attachments, as smaller files transfer faster and use less storage. Whether you are reducing scan quality or optimizing a presentation, this tool helps you make a smaller PDF while preserving readability. Since everything runs client-side, your files never leave your device, ensuring complete privacy and security. Try it now and see how much smaller your PDFs can get with just one click — no sign-up, no uploads, no limits.