Compress PDF
Use it for a lighter copy when the source PDF is already mostly optimised.
Rebuilds the PDF with object streams and removes common document metadata. Processing happens in your browser; results vary by PDF.
What this tool does
Compress PDF rewrites a PDF to reduce structural overhead and remove metadata where the implementation allows.
How it works
- Choose a PDF.
- The browser loads and rewrites its document structure.
- Compare the result size and download it.
What it supports
One PDF file.
A rebuilt PDF that may be smaller than the input.
Common use cases
- Reduce a PDF before attaching it
- Normalise a PDF copy for sharing
Privacy and processing
The PDF is read and rebuilt in your browser. The selected document is not uploaded by this tool.
Limitations
This is not image recompression; image-heavy PDFs may not become smaller.
Frequently asked questions
What does Compress PDF do?
Compress PDF rewrites a PDF to reduce structural overhead and remove metadata where the implementation allows.
Is this tool free to use?
Yes. ArcaThread provides this tool without an account or paid plan.
Are my files uploaded?
The PDF is read and rebuilt in your browser. The selected document is not uploaded by this tool.