Best Free Developer Tools — QR, Base64 & More
GainUtility's developer toolkit provides essential utilities for everyday development tasks. Here are the most-used tools by developers.
Top 6 Developer Tools
- QR Code Generator — Create styled QR codes with custom colors, logos, and error correction. (Best for: Business cards, WiFi sharing, event marketing)
- Base64 Encoder & Decoder — Encode and decode Base64 with full UTF-8 and emoji support. (Best for: API authentication, data embedding)
- UUID Generator — Generate UUID v1, v4, and v7 with cryptographic randomness. (Best for: Database keys, unique identifiers)
- Regex Tester — Test regular expressions with real-time match highlighting. (Best for: Pattern validation, regex debugging)
- JWT Decoder — Decode and inspect JWT token headers and payloads. (Best for: Auth debugging, token inspection)
- Password Generator — Generate cryptographically secure passwords with entropy evaluation. (Best for: Account security, API key generation)
Guides for the jobs above
How to make a QR code that actually scansError correction, module size and the one test to run before you print.Frequently Asked Questions
Are these tools suitable for production use?
Our tools are designed for development, testing, and debugging. For production security, use established libraries and frameworks.
Do these tools store any data?
No. All tools run entirely in your browser. No data is transmitted, stored, or logged on any server.
Can I use these offline?
Yes. Once the page loads, all developer tools work completely offline.