Lossless structural optimization
Compress PDF Online
Rebuild a PDF using compact object streams, optionally remove common metadata, and compare actual sizes.
Results vary. Already-compressed scans may not become smaller.
How to use the PDF compressor
- STEP 1Choose a PDF.
- STEP 2Decide whether to remove common metadata.
- STEP 3Optimize, download, and review the measured result.
About this tool
Optimize document structure without pretending every input can shrink or silently degrading image quality.
Structural compression can help PDFs saved without object streams.
Image-heavy scans usually require lossy resampling for major reductions, which this tool intentionally does not perform.
Frequently asked questions
Will every PDF become smaller?
No. The tool reports the actual result; scanned images and already-optimized PDFs may stay similar or become slightly larger.
Does it reduce image resolution?
No. This version optimizes PDF structure and metadata without deliberately resampling embedded images.
Is the PDF uploaded?
No. The standards-compliant rebuild happens locally in the browser.