Compress PDF
Reduce PDF file size
Rebuild object streams at a higher compression level. This is structural compression, not image downsampling.
Local browser processing No uploads. No account required.
Will scans become blurry?
No. Image resolution and quality are not reduced. The tool mainly compresses uncompressed streams and duplicate structure, so image-only scans may shrink only a little.
Why might the size barely change?
Files that already use object streams and Flate compression have little left to remove. The page shows the size before and after.