About this tool
A bloated PDF can be slow to email or upload. This tool re-saves your PDF using pdf-lib's object-stream compression and strips unnecessary metadata like author and producer fields, reducing file size where possible — all without uploading your document anywhere.
How to use it
- 1Upload a PDF file.
- 2Click "Compress PDF".
- 3Compare the new file size against the original, then download the result.
Common mistakes to avoid
- Expecting large savings on PDFs whose size mainly comes from high-resolution embedded images — this tool compresses document structure, not image data.
- Running compression on an already-optimized PDF and expecting further meaningful reduction.
Use cases
- Getting a PDF under an email attachment size limit.
- Cleaning up metadata before sharing a document externally.
Frequently asked questions
How much smaller will my PDF get?
It depends heavily on the source file — text-heavy PDFs with redundant structure compress more than PDFs dominated by large embedded images.
Is this lossy?
No. Compression here restructures the PDF's internal objects and removes metadata; page content is preserved exactly.