Free Online Tools for Developers & Everyday Tasks
Fast, simple and privacy-friendly online tools. Your data stays in your browser. No registration required.
21 tools available — and growing
Popular Tools
Format, validate and beautify JSON online for free.
Convert JSON data to CSV format instantly in your browser.
Format and beautify SQL queries for better readability.
Decode and inspect JWT tokens. View header, payload and signature.
Test regular expressions live. Highlight matches and inspect groups.
Calculate exact age in years, months and days from a date of birth.
Calculate percentages, percentage change, and percentage of a number.
Calculate GST inclusive and exclusive. Get CGST, SGST and IGST breakdowns.
Calculate monthly EMI, total interest and total payment for any loan.
Developer Tools
JSON, encoding, regex and other utilities for developers.
Format, validate and beautify JSON online for free.
Validate JSON syntax and get clear, precise error messages.
Minify and compress JSON to reduce file size.
Format and beautify SQL queries for better readability.
Encode text or files to Base64 and decode Base64 strings.
Encode and decode URLs and query parameters instantly.
Decode and inspect JWT tokens. View header, payload and signature.
Convert Unix timestamps to human-readable dates and vice versa.
Generate random UUIDs (v4) instantly. Copy single or bulk UUIDs.
Test regular expressions live. Highlight matches and inspect groups.
Build and explain cron expressions with a visual editor.
Calculators
Age, EMI, GST, percentage and more.
Calculate exact age in years, months and days from a date of birth.
Calculate the difference between two dates in days, weeks, months and years.
Calculate percentages, percentage change, and percentage of a number.
Calculate GST inclusive and exclusive. Get CGST, SGST and IGST breakdowns.
Calculate monthly EMI, total interest and total payment for any loan.
Calculate take-home salary from CTC. Includes PF, HRA and tax estimation.
Converters
Convert between formats, units and more.
Convert JSON data to CSV format instantly in your browser.
Convert CSV files to JSON format. Paste CSV and get JSON instantly.
Convert time between world time zones instantly.
Convert length, weight, temperature, area, volume and speed units.