Compress PDF

This browser-based compressor re-renders PDF pages and rebuilds the output as a new PDF using image-based pages at different quality levels. That approach can reduce size for many scan-heavy or image-heavy PDFs without sending the document to a server.

Because the method depends on rebuilding page images, it is much less effective for text-only PDFs and may reduce page sharpness or searchability compared with the original document.

A successful result means a new downloadable PDF has been created using the selected compression level. The result summary compares the source size, output size, and approximate size change so you can judge whether the rebuild actually helped.

Sometimes the output will not shrink very much, and in some cases it may even grow. That is normal for text-heavy or already optimized PDFs.

This is a practical browser-only compression workflow, not a full PDF optimization engine. It does not inspect every embedded asset individually, and it does not guarantee smaller output for every document.

Text-heavy PDFs, forms, bookmarks, attachments, OCR layers, and other advanced PDF features can behave differently or lose fidelity because the pages are rebuilt as compressed images.

Use Compress PDF when you have a scan-heavy or image-heavy file that needs a lighter copy for sharing, uploading, or storage.

If you only need a rough planning number instead of a rebuilt file, compare the workflow with the PDF File Size Estimator or browse the PDF tools hub.