Developer tools
Base64, URL and HTML entity encoding, JSON, YAML and CSV conversion, regex and SQL tools, a cron explainer, plus hash, UUID and password generators. Paste a token or config value and it stays in your browser, never sent to a server.
Base64 Encoder/Decoder
A Base64 encoder and decoder that gets Unicode right
Password Generator
A random password generator built on the browser's crypto RNG
UUID Generator
Create UUID v4 and sortable v7 values in bulk
Hash Generator
MD5 and SHA hashes for text and files, computed in the browser
URL Encoder/Decoder
A URL percent-encoder and decoder that handles Unicode and emoji
HTML Entity Encoder/Decoder
Encode and decode HTML entities for special and non-ASCII characters
JWT Decoder
Decode JWT header and payload and check expiry (no signature verification)
JSON Formatter
Beautify, minify and validate JSON, sort keys, errors with line and column
JSON to CSV Converter
Convert a JSON array of objects to CSV (flattening, delimiters, Excel BOM)
CSV to JSON Converter
Convert CSV to JSON (delimiter auto-detect, headers, type conversion, nesting)
JSON to YAML Converter
Convert JSON to YAML (indent choice, key sorting, error positions)
YAML to JSON Converter
Convert YAML to JSON (safe schema, anchors and merge keys, error line)
SQL Formatter
Beautify SQL (MySQL, PostgreSQL and other dialects, keyword case, indentation)
Unix Timestamp Converter
Epoch to date and back (seconds to nanoseconds, free-text dates, period start and end, code samples)
Number Base Converter
Base 2/8/10/16/36 and custom base conversion with BigInt, negatives and 0x/0b/0o prefixes
Color Converter
HEX, RGB, HSL and OKLCH conversion with a preview and WCAG contrast check
Regex Tester
JavaScript regex tester with flags, match highlighting, group table and replace preview
Cron Expression Parser
Cron expression explainer with 5/6 fields, next 5 runs and time zones
URL Parser
URL component breakdown with decoding, IDN hosts and query parameter editing
Charset Converter
A converter that re-encodes text and files between Korean, Japanese and Unicode encodings
Mojibake Fixer
A tool that repairs mojibake by reversing every likely pair of mixed-up encodings
Unicode Normalizer
A Unicode normalization tool for text and file names, including decomposed macOS names
Meta Tag Generator
A generator for search and social sharing meta tags with link preview mock-ups
Punycode Converter
A converter between Unicode domain names and their xn-- Punycode form