What is ToolsOnline?
ToolsOnline is a free collection of everyday utilities built for software developers, designers, and anyone who works with data, images, or APIs. Every tool is designed to be fast, focused, and private — most run entirely inside your browser without sending any data to a server.
There are no accounts to create, no files to upload to the cloud, and no email gates. Open a tool, do the work, close the tab.
The Tools
Convert between RGB, HEX, HSL, OKLCH, and CMYK. Includes a visual color picker, contrast checker (WCAG), and clipboard copy in any format.
Generate tints, shades, and color harmonies (complementary, triadic, analogous) from any base color. Export as CSS variables or Tailwind config.
Format, validate, and minify JSON. Browse as a collapsible tree, diff two JSON documents, run JSONPath queries, and convert to YAML.
Live regular expression tester with match highlighting, named capture groups, global/multiline/case flags, and replacement preview.
Decode JSON Web Tokens in your browser. Inspect the header, payload, and claims. Verify signatures with a public key or secret.
Read, edit, and strip EXIF metadata from JPEG and TIFF images. Batch-process multiple files and view GPS coordinates on a map.
Compress JPEG, PNG, and WebP images locally in your browser. Adjust quality, compare before/after file sizes, and download results.
Create App Store and Google Play screenshots at correct pixel sizes. Add device frames, custom backgrounds, and headline text. Export as PNG.
Design Open Graph and Twitter card images (1200×630). Choose from templates, customize text and colors, and download as PNG.
Current conditions, hourly forecast, and 10-day outlook for any city worldwide. Powered by Apple WeatherKit. Also available for major US cities.
Our Principles
Privacy first
Client-side tools process everything locally. No file you open in the EXIF Editor, Image Compressor, or JSON Formatter is ever uploaded to our servers. For the Weather tool, only your coordinates are sent — and never stored.
No noise
No signup popups, no cookie banners beyond what's required, no upsell flows. The interface gets out of the way so you can focus on the task.
Keyboard-driven
Every tool is built with real keyboard shortcuts and logical tab order. Press ⌘K from anywhere on the site to jump to any tool instantly.
Technology
ToolsOnline is built with Vue 3 and Vite, statically generated and served from a CDN-backed edge server. The weather feature uses Apple WeatherKit via a lightweight server-side proxy to keep API credentials secure. All other tools use only browser APIs — no external dependencies at runtime.
Contact
Have a question, found a bug, or want to suggest a new tool? Reach us at lava@mbjztech.cn.