Developer toolkit

Developer & Code Tools

36 browser-side tools for encoding, JSON & data, hashing, text, color, time and network work. Everything runs locally in your browser — nothing is uploaded.

All tools API docs

Encoding & text transform (6)

Base64 Encode / DecodeEncode text to Base64 or decode Base64 back to UTF-8 text in your browser. Case ConverterConvert text between UPPER, lower, Title, camelCase, snake_case, kebab-case and CONSTANT_CASE. HTML Entity Encode / DecodeEscape text to HTML entities to prevent injection, or unescape entities back to text. JWT DecoderDecode a JSON Web Token's header and payload in your browser. Tokens are never uploaded. Slug Generator (Slugify)Turn any title or phrase into a clean, lowercase, hyphen-separated URL slug. URL Encode / DecodePercent-encode text for safe use in URLs, or decode a percent-encoded string.

JSON & data (6)

CSV to JSON ConverterConvert CSV text with a header row into a JSON array of objects. Data Size ConverterHumanize a byte count into KiB/MiB/GiB, or parse a human size back into bytes. JSON Formatter & MinifierPretty-print, validate or minify JSON entirely in your browser. JSON to CSV ConverterConvert a JSON array of objects into CSV with a header row. JSON to XML ConverterConvert a JSON document into pretty-printed XML. Query String to JSON ConverterConvert a URL query string into a readable JSON object.

Developer utilities (5)

ChatGPT Session JSON ConverterConvert a ChatGPT Web session JSON into CPA, sub2api, Cockpit and 9router import formats. Runs entirely in your browser. Number Base ConverterConvert integers between binary, octal, decimal and hexadecimal (any base 2-36). Regex TesterTest a regular expression against sample text and see every match, in your browser. String Escape / UnescapeEscape text for a JSON or source-code string literal, or unescape one. Text Diff CheckerCompare two blocks of text and highlight added and removed lines, in your browser.

Hashing & security (4)

HMAC GeneratorGenerate an HMAC signature from text and a secret key using SHA-256 and other algorithms. Hash Generator (MD5, SHA-256)Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text in your browser. Password GeneratorGenerate strong, random passwords with configurable length and character sets. UUID GeneratorGenerate one or more random version 4 UUIDs.

Text toolbox (7)

Line Sorter & DeduplicatorSort, deduplicate, reverse or trim lines of text. Lorem Ipsum GeneratorGenerate placeholder Lorem Ipsum text by paragraphs, sentences or words. Morse Code TranslatorTranslate text into Morse code, or decode Morse code back to text. ROT13 & Caesar CipherApply a ROT13 or Caesar shift cipher to text. Text to Binary ConverterConvert text to 8-bit binary, or binary back to text. Text to Hex ConverterConvert text to its hexadecimal byte representation, or hex back to text. Word & Character CounterCount characters, words, lines and bytes in any text, instantly.

Color (2)

Color Converter (HEX, RGB, HSL)Convert colors between HEX, RGB and HSL notations for CSS and design. RGB to HEX Color ConverterConvert colors between rgb(r, g, b) and #RRGGBB hex notation for CSS and design.

Date & time (3)

Cron Expression to TextDescribe a standard 5-field cron schedule in plain English. Duration HumanizerTurn a number of seconds into a readable duration like 1d 2h 3m 4s. Unix Timestamp ConverterConvert between a Unix epoch timestamp and a human-readable UTC date.

Network (1)

IP Address ConverterConvert an IPv4 address to/from its 32-bit integer, or inspect a CIDR block.

Math (2)

Aspect Ratio CalculatorSimplify a width and height into an aspect ratio like 16:9. Scientific Notation ConverterConvert numbers between decimal and scientific (E) notation.