All free online tools
Search and browse fast, private browser tools for formatting, converting, decoding, testing, and everyday developer work.
Popular tools
JSON Formatter
Pretty print, minify, validate, and sort JSON online.
JSON Validator
Validate JSON syntax instantly in your browser.
JWT Decoder
Decode JWT header and payload segments without verification.
UUID Generator
Generate UUID v4 values in bulk.
Base64 Encoder
Encode text to Base64 online.
Timestamp Converter
Convert Unix timestamps and ISO 8601 dates.
Regex Tester
Test JavaScript regular expressions against sample text.
SQL Formatter
Beautify SQL for MySQL, PostgreSQL, and generic SQL.
All tools
47 tools found
JSON Formatter
Pretty print, minify, validate, and sort JSON online.
JSON Validator
Validate JSON syntax instantly in your browser.
JWT Decoder
Decode JWT header and payload segments without verification.
UUID Generator
Generate UUID v4 values in bulk.
Base64 Encoder
Encode text to Base64 online.
Base64 Decoder
Decode Base64 text online.
Timestamp Converter
Convert Unix timestamps and ISO 8601 dates.
Regex Tester
Test JavaScript regular expressions against sample text.
SQL Formatter
Beautify SQL for MySQL, PostgreSQL, and generic SQL.
Color Converter
Convert colors between HEX, RGB, and HSL.
Lorem Ipsum Generator
Generate placeholder words, sentences, and paragraphs.
URL Encoder
URL-encode text for query strings and paths.
URL Decoder
Decode URL-encoded text online.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
JSON to CSV
Convert JSON arrays to CSV with flattened nested objects.
JSON to YAML
Convert JSON to YAML with nested object support.
JSON Diff Checker
Compare two JSON documents side by side.
Age Calculator
Calculate exact age from a date of birth to today or any comparison date, with years, months, days, and total days.
Percentage Calculator
Calculate percent of a number, percentage share, and percentage increase or decrease for everyday math.
BMI Calculator
Calculate body mass index from weight in kilograms and height in centimeters, with a general BMI category.
Word Counter
Count words, characters, characters without spaces, sentences, and paragraphs for drafts, posts, essays, and metadata.
Character Counter
Count characters with and without spaces.
Date Difference Calculator
Calculate the days between two dates, plus approximate weeks, months, and years for planning and timelines.
Savings Calculator
Estimate how savings may grow from an initial balance, monthly deposits, annual interest rate, and time horizon.
Loan Calculator
Estimate monthly loan payments, total paid, and total interest from loan amount, annual rate, and term.
Compound Interest Calculator
Calculate compound interest and final amount from principal, annual rate, time, and compounding frequency.
QR Code Generator
Generate a QR code for a URL or text string and choose a 200, 300, or 500 pixel square image size.
Unit Converter
Convert common length, weight, and temperature units including kilometers, miles, kilograms, pounds, Celsius, and Fahrenheit.
Password Generator
Generate strong random passwords in your browser.
Case Converter
Convert text to uppercase, lowercase, title case, slug case, and camelCase.
Time Zone Converter
Convert a time between common global time zones.
Discount Calculator
Calculate sale price and savings after a discount.
Tip Calculator
Calculate tip amount, total bill, and split per person.
Salary Calculator
Convert hourly, monthly, and annual pay estimates.
Calorie Calculator
Estimate daily calories from body stats and activity.
Random Number Generator
Generate random numbers between a minimum and maximum.
Fuel Cost Calculator
Estimate trip fuel cost from distance, efficiency, and price.
GPA Calculator
Calculate weighted GPA from grade points and credits.
Grade Calculator
Calculate weighted course grade from scores and weights.
Mortgage Calculator
Estimate monthly mortgage payment before taxes and insurance.
VAT Calculator
Add or remove VAT from a price.
Pregnancy Due Date Calculator
Estimate due date from the first day of the last period.
Electricity Cost Calculator
Estimate electricity cost from watts, hours, and price per kWh.
Birthday Countdown
Count days until the next birthday.
Business Days Calculator
Count weekdays between two dates.
Aspect Ratio Calculator
Resize width or height while preserving aspect ratio.
Image Size Converter
Convert image dimensions to megapixels and estimated raw size.