Developer Utilities & Micro-Tools
Fast, privacy-focused interactive developer utilities. Zero server logging — all conversions run 100% inside your browser.
Formatters
Encoders & Decoders
JWT Token Decoder
PopularDecode JSON Web Tokens (JWT) client-side to inspect payload claims, headers, and expiration dates securely.
Base64 Encoder & Decoder
Encode plain text or binary strings into Base64 format and decode Base64 back to text.
URL Encoder & Decoder
Encode unsafe characters in URLs into %-encoded formats or decode percent-encoded URLs.
Generators
Cron Expression Parser & Humanizer
PopularParse crontab expressions into plain English schedules and calculate upcoming execution times.
Bulk UUID/GUID Generator
Generate bulk cryptographically secure UUID v4 strings for database primary keys and API identifiers.
Cryptographic Hash Generator (MD5, SHA-256)
Compute cryptographic checksum hashes including MD5, SHA-1, SHA-256, and SHA-512 instantly.
Dummy File Generator (CSV & Text)
Generate customizable dummy test files of exact target megabyte sizes (1MB to 50MB) for upload testing.
Text & Code
Character, Word & Line Counter
Count total characters, words, sentences, paragraphs, and UTF-8 byte sizes in real-time.
Regex Tester & Matcher
Test regular expression patterns against sample strings with instant highlight matching and group extraction.
Text Diff & Code Comparison
Compare two text snippets or code blocks side-by-side to highlight added, removed, and modified lines.
HTML & CSS Code Minifier
Compress and minify HTML and CSS files to reduce file sizes and optimize web page loading speeds.
Converters
CSV to JSON & JSON to CSV Converter
Convert raw CSV tabular data into structured JSON arrays or flatten JSON arrays into CSV spreadsheets.
Color Code Converter (HEX, RGB, HSL, CMYK)
Convert color codes seamlessly between HEX, RGB, HSL, and CMYK formats with a visual color picker.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable UTC/local date strings and vice versa.
Full-Width & Half-Width Text Converter
Convert text between full-width (Zenkaku) and half-width (Hankaku) character encodings.