Compress PDF without losing quality
Reduce structural waste without changing image resolution or flattening pages. Results vary: digital PDFs may shrink, while scans that already contain compressed images may barely change.
If the result is not small enough, you can decide separately whether a size target is worth the trade.
This tool runs in your browser. Your document is not uploaded.What happens to your files
How it works
- Choose your PDF.
- Keep Lossless selected.
- Compress and compare the original and result sizes.
- Download the smaller file, or keep the original if the tool says it could not do better.
What lossless compression removes
A PDF can carry duplicated data, inefficient object layout and leftovers no page still uses. Lossless compression repacks those objects. The visible pages, the text layer and the image data stay as they were.
Scans are the exception that proves the rule. Most of a scanned PDF is image data that is already compressed, so there is little structure to remove.
Who should use it
Use it for contracts, court filings, accessible documents, forms, and anything people need to search or copy from. If a hard size cap still rejects the result, the next step is a deliberate trade: exact-size mode, which recompresses the images and can cost sharpness.
Important limitations
- Lossless compression cannot force every PDF under a requested size.
- A file that is already well packed may not shrink. The tool returns the original untouched.
- Encrypted files must be unlocked first.
Frequently asked questions
Why did my PDF not get smaller?
Either it already uses efficient object streams, or most of its bytes are images that cannot shrink without recompression.
What if it is still too big?
Remove pages you do not need, split the file if the recipient accepts several, or decide whether an exact size target is worth the lost image sharpness.