Free Online PDF Tools – Compress, Merge, Split & Convert PDFs
Compress, merge, split, convert, protect, and watermark PDF files instantly — no registration, no file uploads, 100% free. Everything runs securely inside your browser.
Choose a PDF Tool
Compress PDF
Shrink PDF files by up to 70% — no quality loss, no upload.
🛡️ Privacy Shield
PDF Hero ensures all processing happens locally. Your files never leave your device!
⚡ Lightning Speed
Superhero-fast processing with real-time progress. No waiting, no queues!
🌍 Always Free
PDF Hero believes in justice for all! No subscriptions, no hidden fees.
👥 User-Friendly
Intuitive design that even cats can use (though PDF Hero prefers dogs)!
All Free PDF Tools
Each tool also has a dedicated page with guides, tips, and FAQs.
Frequently Asked Questions
Are these PDF tools really free?+
Yes — every tool on AllInOnePDF is completely free to use with no hidden fees, no subscription, and no registration required.
Do you upload my files to a server?+
No. All PDF processing happens entirely inside your web browser using JavaScript. Your files are never sent to any server. Once you close the tab, all data is gone.
What is the maximum file size I can process?+
You can process PDF files up to 50 MB and images up to 10 MB each. For very large PDFs, try splitting the file first.
Which browsers are supported?+
AllInOnePDF works on all modern browsers including Chrome, Firefox, Edge, and Safari. No extensions or plugins are needed.
Can I use these PDF tools on my phone?+
Yes. AllInOnePDF is fully mobile-friendly and works on iOS and Android devices in any modern mobile browser.