Developer Tools
Browse calculators, calendars, timers and reference tools. The complete collection is below.
Developer tools
Number Base Converter
Convert signed whole numbers between binary, octal, decimal, hexadecimal and bases 2–36.
Developer toolsDigital Storage Converter
Convert bytes, decimal storage units and binary units without confusing GB and GiB.
Developer toolsText Difference Checker
Compare two text versions line by line and see inserted, removed and unchanged lines.
Developer toolsJSON Formatter & Validator
Validate JSON, indent it for reading or remove extra whitespace while preserving original number tokens.
Developer toolsURL Component Encoder & Decoder
Encode text for a URL component or decode percent escapes, with an explicit form-style plus option.
Developer toolsBase64 Encoder & Decoder
Encode UTF-8 text as Base64 or decode standard and URL-safe Base64 back to text.
Developer toolsHTML Entity Encoder & Decoder
Encode special HTML characters or decode named and numeric character references as plain text.
Developer toolsHEX, RGB & HSL Color Converter
Convert a three- or six-digit HEX colour or an integer RGB triplet into HEX, RGB and HSL.
Developer toolsSHA Hash Generator
Calculate SHA-256, SHA-384 or SHA-512 hashes of UTF-8 text directly in your browser.
Developer toolsUUID v4 Generator
Generate one or a batch of random version 4 UUIDs using your browser’s cryptographic random source.
Developer toolsJWT Decoder
Inspect a three-part JWT’s header, payload and UTC claim dates without uploading the token.
Developer toolsJSON to CSV Converter
Turn a JSON array of objects into CSV, with quoted fields and optional spreadsheet formula protection.
Developer toolsCSV to JSON Converter
Convert CSV headers and rows into JSON objects while preserving leading zeros and large identifiers as strings.
Developer toolsQuery String Parser
Inspect URL query parameters in order, including repeated keys, empty values and decoded form-query text.
Developer toolsText to Hex Converter
Encode text as hexadecimal UTF-8 bytes or decode a hex byte sequence back to text.
Developer toolsUnicode Inspector
See code points, UTF-16 length and UTF-8 bytes to investigate invisible characters and text differences.
Developer toolsJSON String Escape & Unescape
Convert plain text into a JSON string literal or decode a quoted JSON string back into plain text.
Developer toolsUTF-8 Byte Size Calculator
Measure UTF-8 bytes, Unicode code points and UTF-16 code units before sending or storing text.
Developer toolsPassword Generator
Create random passwords locally with configurable length, symbols and a browser cryptographic random source.
Developer toolsURL Slug Generator
Turn a heading into a lowercase, hyphen-separated slug with ASCII or Unicode letter support.
Developer toolsJSON Pointer Lookup
Select a value from a JSON document using a standard slash-separated JSON Pointer.
Developer toolsJSON Compare
Compare two JSON values structurally, ignoring object key order while retaining array order and value types.
Developer toolsHTTP Header Parser
Read pasted HTTP headers as ordered fields and grouped names while retaining repeated values.
Developer toolsCSV to HTML Table
Generate escaped HTML table source from CSV, including column headers and a simple semantic structure.
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