Optimize PDF
Shrink large PDFs without losing quality. Create email-ready files in seconds.
Drag & drop a PDF file here
Drag and drop or browse to select the PDF you want to compress.
Pick low, medium, or high compression depending on your needs.
Your smaller PDF downloads automatically — ready to email or upload.
This tool uses pdf-lib and PDF.js, both open-source JavaScript libraries that run inside your browser. PDF.js renders each page as an image at a reduced resolution, and pdf-lib rebuilds the PDF from those images. The result is a smaller file with the level of quality you choose — all without any network requests.
Yes, your files never leave your browser. All compression happens locally using JavaScript, so no data is uploaded to any server. Your documents remain completely private.
It depends on the content. Files with large images typically see 30–70% reduction. Text-heavy PDFs may see smaller savings since text data is already compact.
Low compression preserves quality very closely to the original. Medium offers a good balance. High compression trades some visual quality for maximum file size reduction.
Yes, the tool is fully responsive and works on phones and tablets. Select a file from your device and compress it on the go.
No hard limit. The tool processes files using your browser's available memory, so it can handle most typical documents. Very large files may take longer depending on your device.