What compression changes
PDF compression may reduce image quality, simplify embedded resources, or adjust document internals to make the file smaller. The best setting depends on whether you need readability, print quality, or a small upload size.
Before compressing
- Keep a backup of the original file.
- Use documents you own or are authorized to process.
- Check file size limits before uploading.
- Review pages after downloading the compressed file.
Common mistakes
Do not compress the only copy of an important file. Compression is best-effort and can make small text, scanned pages, or images harder to read.
FAQ
Does compression remove private data?
No. Use metadata removal or redaction workflows when data handling cleanup is needed.
Can every PDF be compressed a lot?
No. Some files are already optimized.