Encoders & Developers
Encoding and developer utilities that run entirely client-side. Encode Base64, HTML and URLs, format and convert JSON, decode JWTs, test regular expressions, minify CSS and validate card checksums — safe for sensitive data since nothing is transmitted.
Base64 Encoder
Convert text to Base64 and back. Handles emoji and non-English characters correctly — everything happens in your browser.
Open tool →Credit Card Validator
Check whether a card number passes the Luhn checksum and identify its brand — Visa, Mastercard, Amex, or Discover.
Open tool →CSS Minifier
Shrink your stylesheets by stripping comments and unnecessary whitespace — with a live before/after size comparison.
Open tool →CSV to JSON Converter
Convert CSV data — with a header row and fully quoted fields — into pretty-printed JSON, ready for your code or API.
Open tool →HTML Encoder
Convert special characters to HTML entities for safe display in web pages — or decode entities back to readable text. Both directions update live as you type.
Open tool →JSON Formatter
Paste JSON to validate it, pretty-print it with indentation, or minify it into a single line. Errors are explained in plain language.
Open tool →JSON to CSV Converter
Turn a JSON array of objects into spreadsheet-ready CSV — with proper quoting for commas, quotes, and line breaks.
Open tool →JWT Decoder
Paste a JSON Web Token to decode its header and payload into readable, pretty-printed JSON — instantly.
Open tool →Markdown Preview
Write Markdown on the left, watch it render as HTML on the right — headings, emphasis, lists, code, and links, all live.
Open tool →Regex Tester
Test JavaScript regular expressions against sample text — see every match with its position, toggle flags, and get clear errors for invalid patterns.
Open tool →Unix Timestamp Converter
Convert Unix timestamps to human-readable dates — in UTC and your local timezone — or turn a date back into epoch time.
Open tool →URL Encoder
Percent-encode a URL for safe use in links and APIs, or decode an encoded URL back to readable text.
Open tool →URL Parser
Break any URL into its component parts — protocol, host, port, path, fragment — and inspect every query parameter in a clean list.
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