Compress PDF Online — Free & Private
Billu's PDF Compressor re-serialises your PDF using pdf-lib's object stream compression, reducing file size without re-rendering pages. It works entirely in your browser — no server, no upload, no account.
Common use cases
- Shrink PDFs before emailing as attachments
- Reduce CV/resume size for job applications
- Compress reports before uploading to portals
- Optimise PDF size for mobile viewing
Frequently Asked Questions
How much will it compress my PDF?
Results vary. Text-heavy PDFs compress well (20–50%). Image-heavy PDFs may see less reduction since images are not re-encoded.
Are my files uploaded?
No. Compression runs locally in your browser.
Do password-protected PDFs work?
No. Remove password protection before compressing.