GainUtility's developer toolkit provides essential utilities for everyday development tasks. Generate QR codes, encode/decode Base64 and URLs, create UUIDs, decode JWTs, test regex patterns, and more — all processed locally.
Which developer job do you have?
Pick the job rather than the tool name. Everything below runs locally, with no account and no upload.
Make a QR code — Styled codes for URLs, WiFi, email, WhatsApp and vCards.
Encode or decode Base64 — UTF-8 safe conversion with automatic detection of which direction you need.
Generate a password — Set length and character groups, then copy a Web Crypto random password.
What You Can Do
QR Code Generation — Create styled QR codes for URLs, WiFi, email, WhatsApp, and vCard contacts.
Data Encoding — Encode and decode Base64, URL percent-encoding, and HTML entities.
Code Utilities — Test regex patterns, format SQL/YAML, and build cron expressions.
How to Use
Choose the developer tool you need from the collection.
Enter your input data.
Configure any settings or options.
Copy the output or download results.
Frequently Asked Questions
Are these tools suitable for production use?
Our tools are designed for development, testing, and debugging. For production security tools like password generation, always use established libraries.