What the PDF Compressor Does and Why It Matters
The PDF Compressor rewrites a PDF with the pdf-lib library to shrink its file size — removing redundant structure and unused objects and streamlining how the document is stored — without downsampling your pages, so text stays sharp.
This matters because oversized PDFs bounce off email limits and upload forms. A smaller file is easier to send and store, and doing it in the browser means a sensitive document never has to be uploaded to a compression service.
How to Use PDF Compressor
- Upload the PDF you want to shrink.
- Run the compressor to rebuild the file more efficiently.
- Compare the new size against the original.
- Download the optimized PDF and confirm it still looks correct.
Supported Inputs and Limitations
What you provide
- A PDF file from your device
What you get
- A re-saved PDF with reduced file size where possible
- The same pages, with text quality preserved
Known limitations
- Savings vary: PDFs dominated by large embedded images may shrink only modestly because pages are not downsampled.
- Already-optimized files may see little change.
- For very heavy scanned PDFs, image-focused desktop tools can compress more aggressively (at some quality cost).
Privacy and Security
Compression runs entirely in your browser via pdf-lib. Your PDF is processed on your device and is never uploaded to NovaTools or any external server.
Frequently Asked Questions
Will compression reduce my page quality?
No. Pages are not downsampled, so text and vector content stay crisp. Size savings come from streamlining the file structure rather than degrading content.
Why did my file barely get smaller?
If most of the file is large embedded images or it is already optimized, structural compression yields limited gains. A dedicated image-recompression tool would shrink it further at a quality trade-off.
Is my PDF uploaded to compress it?
No. The work is done locally and the document stays in your browser.