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About this tool
A closer look at Compress PDF
Compress PDF reduces redundant PDF structure and can re-encode large embedded JPEG images to shrink file size — all locally. Structure compression is lossless, and image recompression is quality-controlled; text and vector content are preserved.
Supported files
PDF (.pdf)
How to use it
- 1Choose a PDF
- 2Process locally
- 3Download the optimized copy
What you can use it for
- Shrinking a PDF so it fits under email attachment limits.
- Reducing file size before uploading to portals with size caps.
- Freeing space when archiving many PDFs locally.
What to keep in mind
- Already-optimized PDFs may shrink very little.
- Only JPEG-encoded images are recompressed; other image types are left untouched.
- Image-heavy PDFs see the biggest gains; text-only PDFs see modest ones.
- Compression is not a substitute for re-exporting a better-quality original.
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Frequently asked questions
Is compression lossless?
Structural compression is lossless. Large embedded JPEG images may be re-encoded at a quality-controlled level; text and vector content are preserved.
Why isn't my file getting much smaller?
Already-optimized PDFs shrink very little, and only JPEG-encoded images are recompressed — so text-only files see modest gains and image-heavy files see the biggest.
Can I restore the original after compressing?
No. Keep a backup of the original file before you compress it.