How to use
- Select an unlocked PDF and check its original size.
- Try structure optimization first.
- For strong compression, choose a quality profile and confirm the stated losses.
- Compare the final size and check small text, numbers and codes.
Choose the appropriate compression mode
Optimization rewrites the PDF structure without deliberately turning pages into images. Already optimized PDFs may not become smaller. If the new file is larger, the original bytes are kept. Strong compression renders every page as a JPG image inside a new PDF. It can help with large scans but changes the document substantially.
Quality and size limits
Strong compression removes selectable text, links, forms and verifiable digital signatures. A smaller quality profile can make fine details harder to read. No exact output size, such as 1 MB or 2 MB, is guaranteed. Keep the original and confirm the recipient accepts an image-based PDF.
Frequently asked questions
Can I compress without losing quality?
Try optimization first. It may produce little or no reduction; strong compression changes image resolution and quality.
Are digital signatures preserved?
Do not rely on that. Editing can invalidate signatures, and strong compression creates image-based pages.