Popular

Merge PDF Split PDF Compress PDF PDF to Word JPG to PDF

All Tools

Organize PDF Rotate PDF Edit PDF Protect PDF Unlock PDF Watermark OCR PDF AI Summarizer Browse all tools โ†’

Contact us

A human reads every message. Support questions, feedback, security reports, business inquiries โ€” pick the right channel below and we'll reply as soon as we can.

๐Ÿ’ฌ

Support & feedback

A tool isn't working, you have a question about Premium, or you have an idea to make 400Tools better? Write to us any time.

support@400tools.com

๐Ÿ”

Security vulnerabilities

Found a security issue? Please report it responsibly instead of publishing it publicly. Include steps to reproduce and the affected tool. We verify every report and patch with priority.

security@400tools.com

๐Ÿงพ

Billing & legal

Billing questions, refund requests, privacy/data requests (GDPR, CCPA), and legal notices. See our Privacy Policy for your rights.

legal@400tools.com

Send a message

This form opens your email app with your message pre-filled โ€” nothing is stored on our servers.

Looking for a quick answer?

Many common questions โ€” file limits, which tools work offline, refund policy โ€” are already answered in our FAQ.

Visit the FAQ