How to use
- Click the dashed box (or drag & drop) to select the PDF you want to compress.
- Click "Compress now" — the tool re-encodes the PDF with object streams right in your browser.
- The compressed file downloads automatically with a before/after size comparison.
FAQ
Will my file always get smaller?
Most digitally-created PDFs shrink noticeably, but the ratio depends on the internal structure. Scanned PDFs gain little because pages are already full-page images.
Is my file uploaded anywhere?
No. Compression happens entirely inside your browser; the file never leaves your computer and works offline.
Any limits?
No usage limits. File size is only bound by browser memory — keeping files under 100MB is recommended.
About this PDF Compressor
This tool uses the client-side pdf-lib engine to losslessly re-encode your PDF, shrinking file size through object streams and structural optimization — no server involved. Text-and-vector PDFs compress well; scanned (image-based) PDFs have limited gains since each page is already a picture.