Contact us
Report a bug, suggest a tool, or ask a question — we read everything.
The fastest way to reach us is by email:
To help us respond quickly, include:
- Which tool you were using (a link is perfect)
- What you expected vs. what happened
- Your device and browser, if reporting a bug
We usually reply within 1–2 business days. Note that we can't provide financial, legal or tax advice — our tools are for information and education only.
Common questions
Do I need an account to use the tools?
No. Every tool on 4C Tool Hub is free and works without any sign-up or login.
Are my files uploaded when I use the PDF or image tools?
No. File tools run entirely in your browser using local processing — your files never leave your device.
Can I suggest a new tool?
Absolutely — tool suggestions are the most useful email we get. Tell us what you're trying to do and we'll consider building it.
Can I use your calculators for my business or classroom?
Yes, feel free to link to any tool. The calculators use standard formulas and are free for personal, educational and commercial use.