PDF Tools
Compress PDF — Free Online
Free online compress pdf tool. Reduce PDF file size. Part of our pdf tools — no signup, no uploads, runs in your browser.
Re-optimizes the PDF structure in your browser. For scanned PDFs, try PDF to Images and back for stronger size reduction.
About Compress PDF
Free online compress pdf tool. Reduce PDF file size. Part of our pdf tools — no signup, no uploads, runs in your browser.
Why choose Online Tool Hub?
- Free forever — supported by non-intrusive ads
- Privacy-first — client-side processing when possible
- Works on any device with a modern browser
- Part of a growing suite of 35 free pdf tools
Frequently asked questions
- How do I use the Compress PDF tool?
- Select a PDF from your device, adjust any options shown, then click the action button. The result downloads immediately. If the PDF is password-protected, use the Unlock PDF tool first.
- What PDF formats are supported?
- Standard PDF files from Acrobat, browsers, Office exports, and scanners are supported. Very large files may be slower on older devices because processing happens locally in your browser.
- How much smaller will my PDF get?
- Results vary. Text-based PDFs often shrink modestly. Scanned PDFs may need PDF to Images and back for stronger compression.
- Are my files uploaded to your servers?
- No. This tool runs in your browser whenever possible. Your files and text stay on your device and are not sent to our servers for processing.
- Do I need an account or subscription?
- No account is required. Online Tool Hub document tools are free to use with no signup and no usage limits.