Compress PDF Online Free
Reduce PDF file size in your browser. Shrink documents for email without uploading to a server.
Compress PDF re-encodes page images at a lower quality to cut file weight. Scanned documents and image-heavy PDFs benefit most.
Choose Light for text-heavy files, Balanced for everyday use, or Strong for the smallest output.
How to use
- Upload your PDF.
- Select a compression level.
- Click Compress & download.
- Compare the before/after size shown on screen.
Frequently asked questions
Is my PDF uploaded to a server?
No. All processing happens locally in your browser. Your files never leave your device.
Is aismartpdf.com completely free?
Yes. Every tool is 100% free with no ads, no paywall, and no account required. There are no hidden fees or premium upgrades.
Will compression reduce text quality?
Light mode keeps text sharp. Strong mode rasterizes pages as images — best for scans, less ideal for selectable text PDFs.