Free online developer tools

Pretty print, minify, validate, and sort JSON online.

Validate JSON syntax instantly in your browser.

Decode JWT header and payload segments without verification.

Generate UUID v4 values in bulk.

Encode text to Base64 online.

Decode Base64 text online.

Convert Unix timestamps and ISO 8601 dates.

Test JavaScript regular expressions against sample text.

Beautify SQL for MySQL, PostgreSQL, and generic SQL.

Convert colors between HEX, RGB, and HSL.

Generate placeholder words, sentences, and paragraphs.

URL-encode text for query strings and paths.

Decode URL-encoded text online.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.

Convert JSON arrays to CSV with flattened nested objects.

Convert JSON to YAML with nested object support.

Compare two JSON documents side by side.

Calculate exact age from a date of birth to today or any comparison date, with years, months, days, and total days.

Calculate percent of a number, percentage share, and percentage increase or decrease for everyday math.

Calculate body mass index from weight in kilograms and height in centimeters, with a general BMI category.

Count words, characters, characters without spaces, sentences, and paragraphs for drafts, posts, essays, and metadata.

Count characters with and without spaces.

Calculate the days between two dates, plus approximate weeks, months, and years for planning and timelines.

Estimate how savings may grow from an initial balance, monthly deposits, annual interest rate, and time horizon.

Estimate monthly loan payments, total paid, and total interest from loan amount, annual rate, and term.

Calculate compound interest and final amount from principal, annual rate, time, and compounding frequency.

Generate a QR code for a URL or text string and choose a 200, 300, or 500 pixel square image size.

Convert common length, weight, and temperature units including kilometers, miles, kilograms, pounds, Celsius, and Fahrenheit.

Generate strong random passwords in your browser.

Convert text to uppercase, lowercase, title case, slug case, and camelCase.

Convert a time between common global time zones.

Calculate sale price and savings after a discount.

Calculate tip amount, total bill, and split per person.

Convert hourly, monthly, and annual pay estimates.

Estimate daily calories from body stats and activity.

Generate random numbers between a minimum and maximum.

Estimate trip fuel cost from distance, efficiency, and price.

Calculate weighted GPA from grade points and credits.

Calculate weighted course grade from scores and weights.

Estimate monthly mortgage payment before taxes and insurance.

Add or remove VAT from a price.

Estimate due date from the first day of the last period.

Estimate electricity cost from watts, hours, and price per kWh.

Count days until the next birthday.

Count weekdays between two dates.

Resize width or height while preserving aspect ratio.

Convert image dimensions to megapixels and estimated raw size.