Developer Tools
Format, validate, encode, decode, and generate data for daily development workflows. Use this browser-based tool for everyday work. It is designed for speed, privacy, and clear results.
UUID v4 Generator
Generate random RFC 4122 UUID v4 identifiers in the browser.
LiveULID Generator
Generate sortable ULID identifiers with timestamp prefixes.
LiveHEX to RGB Converter
Convert HEX color values into RGB channel values.
LiveRGB to HEX Converter
Convert RGB channel values into a HEX color.
LiveColor Contrast Checker
Calculate WCAG contrast ratio between two colors.
LiveTimestamp Converter
Convert Unix timestamps to ISO dates and ISO dates back to Unix seconds.
LiveLength Converter
Convert common metric and imperial length units.
LiveWeight Converter
Convert grams, kilograms, pounds, ounces, stones, and tons.
LiveTemperature Converter
Convert Celsius, Fahrenheit, and Kelvin values.
LiveData Size Converter
Convert bits, bytes, decimal units, and binary data units.
LiveRegex Tester
Test regular expressions and inspect matches, groups, and named groups.
LivePassword Generator
Generate strong random passwords locally with selected character sets.
LiveRandom String Generator
Generate random strings for IDs, test data, and temporary tokens.
LiveSHA-1 Generator
Generate SHA-1 hashes locally for checksums and legacy comparisons.
LiveSHA-256 Generator
Generate SHA-256 hashes locally in your browser.
LiveSHA-512 Generator
Generate SHA-512 hashes locally in your browser.
LivePercentage Calculator
Calculate what percentage one value is of another.
LivePercentage Change Calculator
Calculate percentage increase or decrease between two values.
LiveDiscount Calculator
Calculate discounted price from price and discount percentage.
LiveLoan Payment Calculator
Estimate monthly loan payments from principal, rate, and term.
LiveCompound Interest Calculator
Estimate compound growth over time with repeated compounding.
LiveNumber Base Converter
Convert integers between bases from binary to base 36.
LiveCron Expression Explainer
Explain basic five-field cron expressions in readable language.
LiveCSS Clamp Generator
Generate responsive CSS clamp() values from pixel ranges.
LiveBox Shadow Generator
Generate CSS box-shadow declarations with offsets, blur, spread, and color.
LiveBorder Radius Generator
Generate CSS border-radius shorthand values.
LiveCSS Gradient Generator
Generate linear-gradient CSS strings from color stops.
LiveWiFi QR Payload Generator
Generate the text payload used by WiFi QR codes.
LivevCard Payload Generator
Generate vCard text for contact QR codes.
LiveMailto Link Builder
Build mailto links with subject, body, cc, and bcc parameters.
LiveEAN-13 Validator
Validate EAN-13 barcode digits and checksum.
LiveFile Summary
Summarize file names, sizes, MIME types, and detected extensions.
LiveBase64 Size Estimator
Estimate the encoded Base64 size for a file or byte count.