Developer Tools

Format, validate, and minify JSON in your browser. Pretty-print raw JSON with indentation, catch inline syntax errors, or collapse to one line.

Encode text to Base64 or decode Base64 back to plain text. Supports full UTF-8 including emoji. Runs in your browser — data never leaves your device.

Encode or decode URL components and query strings instantly. Converts special characters to percent-encoded format — essential for debugging web requests.

Generate SHA-1, SHA-256, and SHA-512 hashes from any text. Results update live as you type — runs via Web Crypto API, data stays in your browser.

Generate random UUID v4 identifiers instantly. Choose uppercase or lowercase, with or without hyphens. Uses the browser's secure crypto API.

Test and debug regular expressions with live match highlighting. Supports g, i, m, s flags and capture groups — ideal for developers and data engineers.

Decode JSON Web Token (JWT) headers, payloads, and claims. Displays exp and iat as human-readable dates. Runs entirely in your browser — token never sent.

Build cron expressions visually or paste any cron string for a plain-English description. Supports 5-field syntax with common presets for developers.

Generate secure random passwords with customizable length and character sets. Uses crypto.getRandomValues.

Format and beautify SQL queries — supports PostgreSQL, MySQL, SQLite, SQL Server, BigQuery, and standard SQL.

Validate YAML syntax and convert between YAML and JSON. Catches indentation errors and reports line numbers.

Format, prettify, and validate XML documents. Configurable indent and minify mode.

Convert Markdown to clean HTML — GitHub-flavored with live preview, copy output, and download options.

Searchable reference for all HTTP status codes — 1xx informational through 5xx server errors with descriptions.

Parse any User-Agent string into browser name, version, OS, engine, and device type. Load your own UA or paste any string. Runs locally in your browser.

Create beautiful linear and radial CSS gradients with a live preview and copy-ready code.

Check color contrast against WCAG 2.1 AA and AAA standards. Verify accessibility for text and UI.

Convert between numeric (755) and symbolic (rwxr-xr-x) Unix file permissions. Click permission bits to build a chmod value.

Generate a .gitignore file for any stack — Node, Python, Java, macOS, VSCode, and more. Pick multiple templates and combine.

Build cURL commands from a form. Pick method, add headers, query params, and JSON body — get a shell-safe command to copy.

Convert JSON to YAML and YAML to JSON instantly. Validates input, preserves types, and handles nested structures.

Visual CSS box-shadow generator with live preview. Adjust offset, blur, spread, color, and inset. Copy production-ready CSS.

Paste CSV, TSV, or edit cells directly to generate GitHub-flavored markdown tables. Supports column alignment (left/center/right).

Visual CSS border-radius generator. Adjust each corner independently with sliders, preview live, and copy the CSS.

Compare two JSON objects and see added, removed, and changed keys with full path. Works on nested structures and arrays — pure browser, nothing uploaded.

Evaluate a cron expression in any IANA timezone. Get the next 5 fire times, time-until-each, and human-readable schedule explanation.

Searchable regex reference covering character classes, quantifiers, anchors, lookaround, groups, and flags. Each entry includes a usable pattern and example.

Look up MIME types by file extension or vice versa. Searchable database covering text, image, audio, video, application, and font media types per IANA registry.

Encode special characters to HTML entities or decode entities back to characters. Supports named entities, numeric (&#NN;), and hex (&#xNN;) forms.

Validate a UUID and identify its version (1, 3, 4, 5, 6, 7, 8) plus variant. Decodes embedded timestamps for v1, v6, and v7 UUIDs.