Developer & Code
JSON that arrives on one line, a token nobody can read, a cron string from 2019, a regex that matches too much. These small problems eat more of a week than most features do.
The category holds formatters for JSON, SQL and code (with Prettier), minifiers, converters between JSON, YAML and CSV, and encoders for Base64, URLs and HTML entities. It also has hashes, UUIDs, a JWT decoder, a regex tester, QR codes and CSS generators for gradients and shadows.
What you paste is processed in the tab and not sent to a server.
JSON Formatter & Validator
Format, minify and validate messy JSON code with syntax checking, error highlighting and key sorting.
Base64 Encoder & Decoder
Encode text to Base64 and decode it back with full UTF-8 support and a URL-safe option.
Text Hash Generator
Calculate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text while you type.
UUID / GUID Generator
Generate random version 4 UUIDs and GUIDs with the Web Crypto API, one at a time or up to 1000 per batch, with optional formatting.
JWT Decoder & Inspector
Decode a JSON Web Token in your browser and read its header and payload as formatted JSON, with a check of the exp claim against your clock.
RegEx Tester & Live Evaluator
Test JavaScript regular expressions in your browser. Matches are highlighted as you type, with flag checkboxes and a match counter.
URL Encoder / Decoder & Parameter Inspector
Encode and decode URLs with encodeURIComponent or encodeURI, and read the query parameters of a URL in a key-value table.
HTML Entities Encoder / Decoder
Encode special characters to HTML entities or decode named, decimal and hex entities back to text – instantly in your browser.
Number Base Converter (Binary, Hex, Decimal)
Convert integers between binary, octal, decimal, hexadecimal and any base from 2 to 36 – with exact results for very large numbers.
Cron Expression Parser
Read a 5-field cron expression in plain language and see five rough sample run times. Common patterns only; the run times are an estimate.
Markdown Live Preview & HTML
Write Markdown and watch the preview update as you type. Tables, task lists, images and nested lists work. Copy the HTML or save it as a file.
QR Code Generator
Create scannable QR codes for links, Wi-Fi, email, phone numbers or plain text, with custom colors and margin, as PNG or vector SVG.
Fake Data & Mock JSON Generator
Create realistic dummy datasets (1 to 1,000 entries) in no time as JSON, CSV, SQL insert or TypeScript with customizable fields.
CSV ↔ JSON Converter
Convert CSV to JSON or JSON to CSV with quoted fields, delimiter detection, typed values and row and column counts.
CSS Gradient Generator
Build linear, radial and conic CSS gradients with 2 to 8 color stops, alpha and repeating mode, and copy the finished background rule.
Box Shadow Generator
Build a CSS box-shadow from up to six layers with offsets, blur, spread, colour, opacity and inset, check it on a live preview and copy the code.
JSON Diff
Compare two JSON documents and list every added, removed and changed value with its JSON Pointer path. Copy the result as text or as a JSON Patch.
YAML ↔ JSON Converter
Convert YAML to JSON and JSON to YAML in your browser. Handles several documents, anchors, aliases and shows errors with line and column.
SQL Formatter
Format SQL queries with 20 dialects, keyword case, indent and placeholder options. Runs in your browser.
Code Beautifier
Format JavaScript, JSON, CSS, SCSS, LESS and HTML with Prettier. Set indent, print width, quotes, semicolons and trailing commas, then copy or download the result.
Code Minifier
Minify JavaScript with Terser and CSS with csso in your browser, with byte and gzip savings.