Developer Tools

Format, validate, and minify JSON instantly — with configurable indentation, error location, and tree view.

Count tokens for GPT-4o, Claude, Gemini, and more. Exact tiktoken counts for OpenAI models, estimates for others, with API cost breakdown.

Encode text or files to Base64 or decode Base64 strings back to plain text — real-time, fully in your browser.

Decode and inspect JWT tokens — view header, payload, claims, and expiry status without sending data to any server.

Encode or decode URLs and query string components instantly — supports encodeURIComponent, decodeURIComponent, and full URL encoding.

Format, minify, and validate XML online — syntax checking with clear error messages, configurable indent, real-time output.

Escape or unescape strings for JSON, HTML, JavaScript, CSV, and SQL — real-time, client-side, zero dependencies.

Format and beautify messy HTML with configurable indent, wrapping, and attribute handling — paste or type, get clean output instantly.

Format, beautify, and minify SQL queries with dialect support for MySQL, PostgreSQL, SQL Server, BigQuery, and more.

Build and sign JWT tokens with a visual editor — set header, payload claims, expiry, and sign with HS256/HS384/HS512.

Convert HTML to clean Markdown — paste HTML source and get properly formatted .md output with headings, links, lists, and code blocks.

Generate cryptographically secure v4 and v7 UUIDs in bulk — copy individually or all at once, instantly in your browser.

Convert YAML to JSON or JSON to YAML bidirectionally — type preservation, null handling, and configurable indentation.

Convert CSV to JSON or JSON to CSV instantly — paste data or upload a file with full delimiter and header control.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files instantly in your browser.

Encode the five HTML-special characters into entities and decode named, decimal, and hex entities back to text. Runs fully in-browser.

Calculate Linux and Unix file permissions. Toggle read, write, and execute for owner, group, and others — get octal, symbolic, and chmod command.

Complete HTTP status code reference with descriptions, causes, and examples — searchable and filterable by category.

Write Markdown and see a live GitHub-flavoured HTML preview side by side — export clean HTML instantly.

Build cron expressions visually or decode any cron string into plain English with next run previews.

Parse any user agent string to detect browser, version, OS, device type, and rendering engine. Includes one-click detection of your own browser.

Paste any cron expression and get a plain English explanation, per-field breakdown, and a preview of the next scheduled run times.

Generate .gitignore files for Node.js, Python, Go, Rust, React, Next.js, Vite, Laravel, Django, Docker, Terraform, VS Code, macOS and more.

Minify JavaScript code with Terser — mangle variables, strip dead code, and show size reduction instantly.

Test regular expressions live with color-coded match highlighting, capture groups, replace mode, and common presets.

Minify and compress CSS for production — strip whitespace, merge rules, and show size reduction instantly.

Convert curl commands to JavaScript fetch API code instantly. Supports all common flags: headers, POST data, auth, form data, and more.

Paste JSON and generate TypeScript interfaces or type aliases instantly. Handles nested objects, arrays, and nullables. Free, in-browser.

Convert Unix timestamps to human-readable dates or dates to epoch timestamps — with timezone support and multiple formats.

Paste any PEM-encoded SSL/TLS certificate and instantly decode all X.509 fields: subject, issuer, validity, SANs, key usage, fingerprints, and more.

Convert between SQL INSERT statements, CSV, and JSON. Transform CSV to SQL INSERTs, SQL to JSON, or JSON to SQL INSERTs with dialect options.

Get a temporary webhook URL and inspect incoming requests in real time. See headers, body, query params, and get a cURL replay command.

Build linear, radial, and conic CSS gradients visually with a live preview and color stop editor.

Compare two texts, code files, or documents side by side — word-level diff highlighting, private and browser-based.

Optimize and compress SVG files with SVGO — remove metadata, comments, and redundant paths for 40–80% size reduction.

Format and beautify minified or messy JavaScript code instantly. 2 or 4 space indent, or tabs.