What is Compress PDF?
Compress PDF files online free to reduce file size for email or upload limits. Choose your compression level — no upload, processed entirely in your browser. It runs entirely in your browser, so there's no upload, no server involved, and no account required.
When to Use Compress PDF
Use Compress PDF when you need to:
- Email sharing
- Storage optimization
- Upload limits
- Bandwidth reduction
How to Use Compress PDF
- 1.Upload the PDF you want to shrink.
- 2.Pick a compression level: Light, Recommended, or Strong.
- 3.Compress PDF processes it locally and shows the new size before you download.
- 4.Download the smaller file — if compressing wouldn't actually help (common for text-only PDFs), you're told instead of getting a bigger file back.
Frequently Asked Questions
Will compressing reduce my PDF's quality?
At "Light" it's barely noticeable; "Strong" trades visible quality for the smallest file. We also never hand back a file bigger than what you started with — if compressing wouldn't help, we tell you.
Why didn't my PDF get any smaller?
Text-based PDFs are often already smaller than any image version of themselves. Compression helps most with scanned or image-heavy PDFs — for pure text, your file was likely already efficient.
What's a good target size for email attachments?
Most email providers cap attachments around 25 MB, but many people aim smaller for reliability. Try "Recommended" first, then "Strong" if you still need it lighter.
Privacy & Security
Your compress pdf operations are 100% private:
- Nothing is uploaded to a server
- No account or sign-up required
- Works completely offline after the page loads
- All processing happens on your device
- No tracking or analytics on your files
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