Compress PDF
Make scans and photo-heavy PDFs smaller by re-encoding their images at a sensible resolution, or give a size limit and let Nibbo find the best quality that fits.
When you need it
Most of a large PDF’s size comes from scanned pages and photos. Text and vector drawings take very little space.
Scans from phones and office copiers are often stored at 300–600 DPI, far more than a screen or an upload form needs.
How it works
- Each photo is resized to the chosen resolution for the largest size it can appear on the page, then saved as JPEG.
- Unused objects, embedded page thumbnails and (if you like) metadata are removed, and the file structure is packed into compressed streams.
- In target-size mode we try settings from gentlest to strongest with a binary search and keep the best one that fits.
Questions
Why didn’t my PDF get smaller?
PDFs made of text and vector graphics (most exported documents) are already compact. The savings come from photos and scans; if there are none, we tell you instead of handing back a bigger file.
Will text stay sharp?
Yes. Text and vector drawings are not touched; only embedded pictures are re-encoded.
Is the result still searchable?
Yes, the text layer is kept.