How does PDF compression work?
Choose a PDF and start compression. Tooloo rewrites it with object streams and shows before and after sizes.
Tooloo · PDF Toolkit
Compress PDF
Rewrite PDF structure in your browser and try to reduce file size without uploading it.
✓ Browser processing✓ Files stay private✓ No upload
Is the file uploaded?
No. Compression runs only in browser memory.
Compression limits
Images are not resampled, so every PDF is not guaranteed to become smaller. A larger result does not replace your original.
Why is the reduction small?
Scanned PDFs are mostly image data. This version prioritizes quality and does not reduce image resolution.