Free online tools
Quick helpers for the jobs that do not need a spreadsheet or a new app: paste, clean up, check, copy, and get back to work.
No sign-upRuns in your browser3 tools
Choose a tool
Pick the JSON formatter for an API response, config file, or pasted data that needs to be readable and valid. Use the QR code generator to turn a link, Wi-Fi network, or contact detail into a scannable code.
Developer tool
JSON formatter and validator
Format, minify, and check JSON in your browser. Pasted data stays on the page and is not sent to Calculation Hub.
Validate JSON syntax
Format JSON with two-space indentation
Minify JSON for smaller files
Productivity tool
QR code generator
Create QR codes for links, text, email, phone, SMS, and Wi-Fi. Everything is generated in your browser, with copy and download in PNG or SVG.
Encode links, text, email, phone, SMS, and Wi-Fi
Download as PNG or SVG
Copy the QR image or its encoded content
Developer tool
Unix timestamp converter
Convert Unix timestamps to human-readable dates and dates back to epoch time in your browser. Handles seconds and milliseconds with UTC, local time, and ISO 8601 output.
Convert epoch timestamps to readable dates
Convert dates back to seconds and milliseconds
Auto-detect seconds vs. milliseconds