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Compress PDF

About this tool

Reduce a PDF's file size by re-serializing it with a more efficient internal structure. The compression profile is accepted for future use but doesn't change today's output — every profile currently applies the same optimization.

How to use it

  1. Upload the PDF you want to compress.
  2. Pick a compression profile (currently has no effect on the result - see the FAQ).
  3. Download the smaller file.

Frequently asked questions

What's the difference between the profiles?
Right now, none. This tool is built on pdf-lib, which can't yet recompress or downsample embedded images, so every profile produces the same output - biggest size reductions come from PDFs with many indirect objects, while heavily image-based PDFs see the least change. Per-profile image compression is planned for a future update.