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PDF compression mainly reduces the weight of embedded images (photos, scans, logos). Vector text and curves are preserved losslessly, even at 30% quality. For a purely text-based PDF without images, the gain is often negligible (less than 10%).
Free, no account required, browser processing and no server upload.
Drop a file — Compress PDF
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Max 100 Mo
PDF compression mainly reduces the weight of embedded images (photos, scans, logos). Vector text and curves are preserved losslessly, even at 30% quality. For a purely text-based PDF without images, the gain is often negligible (less than 10%).
Technical limit
Too aggressive compression (< 40%) can degrade QR codes and small text within images. Always check the output before deleting the original.
Recommended quality
80-100%
Archiving, printing
10-30%
50-70%
Email sharing, web
40-60%
20-40%
Drafts, large attachments
70-85%
When compression is useless
A 3-page PDF containing only text and simple tables: the gain will be under 5%, because vector text does not "compress". In this case, prefer a PDF cleanup to remove unnecessary objects.
Compress PDF helps you complete this task directly in your browser. You keep control of your data and get the result locally.
Yes. Compress PDF is free to use and runs in your browser without sending files or content to Lmaotools servers for processing or storage.
No. Files and content added to the tools are processed in your browser. They are not sent to Lmaotools servers for conversion or storage.
No. Open the tool, add your file or content, then get the result. Processing happens locally in your browser.