About Us
Building tools that respect your privacy
NebulaTool is a collection of free, browser-based utilities for developers and creators. Every tool runs entirely on your device. Your files and data never leave your browser.
Our Mission
We believe developer tools should be fast, free, and private. Too many online tools upload your files to remote servers, gate features behind sign-ups, or bombard you with intrusive ads.
NebulaTool takes a different approach. Every tool is built around three principles:
- 01Privacy First – 100% client-side processing. Zero file uploads. Your data stays on your machine, always.
- 02Speed – Optimized for near-instant page loads. No spinners, no waiting. Paste, drop, or type and get results immediately.
- 03Simplicity – No accounts, no daily limits, no paywalls. Open a tool, use it, done.
What You Can Do
Format & Validate Data
JSON formatting, validation, beautification, minification, and conversion to CSV, XML, or YAML.
Encode & Decode
Base64 encoding and decoding for text, files, and images. URL-safe mode included.
Optimize Images
Compress and convert images between JPG, PNG, and WebP. Batch processing supported.
Design Utilities
Color picker with HEX, RGB, HSL conversion, WCAG contrast checker, and gradient CSS generator.
How It Works
Every tool processes your data directly in the browser using built-in web APIs. No server-side processing, no temporary file storage, no third-party access to your content.
Paste, drop, or type your input
Tool processes instantly in your browser
Copy or download the result