Every tool runs 100% in your browser. No sign-up, no data collection, no rate limits.
Format, beautify, validate, and minify JSON. Detects BigInt precision issues, duplicate keys, and JSONC comments.
Compare two JSON objects side-by-side and highlight differences.
Convert JSON to TOON (Token-Oriented Object Notation) to reduce LLM prompt token usage by ~40%. Lossless and bidirectional.
Validate JSON data against a JSON Schema in your browser. See detailed error paths and messages. Supports draft-07 and 2020-12.
Encode or decode Base64 strings instantly. Supports standard and URL-safe variants.
Encode or decode URL components and query strings.
Convert PNG, JPG, GIF, WebP, SVG, and BMP to Base64. Output as raw string, CSS background-image, or HTML <img> tag. Drag & drop.
Look up Unicode code points, HTML entities, hex values, and UTF-8 bytes for any character or text. Supports emoji.
Decode and inspect JWT tokens. View header, payload, and signature without a secret.
Generate and verify JWT tokens with HS256 or RS256 signing.
Generate RFC-4122 UUIDs (v1, v4, v5) and ULIDs instantly.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any string.
Generate QR codes for URLs, text, WiFi credentials, emails, and vCards. Custom colors, PNG/SVG download.
Generate cryptographically secure passwords and EFF-style passphrases using the Web Crypto API.
Generate placeholder text by paragraph, sentence, or word count. Classic and authentic Cicero Latin variants.
Build MCP server configs for Claude Desktop and Claude Code visually. Add presets, set env vars, copy JSON instantly.
Turn any code snippet into a beautiful screenshot. Pick a theme, font, and background, then download a shareable PNG. Runs fully in your browser.
Generate linear, radial, and conic CSS gradients and layered box-shadows with a live preview. Copy ready-to-use CSS.
Convert Unix timestamps to human-readable dates and vice versa.
Convert colors between HEX, RGB, and HSL formats instantly.
Convert numbers between binary, octal, decimal, and hexadecimal.
Convert YAML to JSON or JSON to YAML with a direction toggle. Powered by js-yaml. Bidirectional and lossless.
Convert CSV to JSON or JSON to CSV in your browser. Supports custom delimiters, header rows, and dynamic typing.
Convert TOML to JSON or JSON to TOML. Supports Cargo.toml, pyproject.toml, and Hugo config files. Bidirectional.
Check WCAG 2.1 contrast ratios for AA and AAA, normal and large text. Live preview plus accessible color suggestions.
Convert .env files to JSON or YAML and back. Handles comments, quotes, export prefixes, and nested keys. Bidirectional.
Test and debug regular expressions with real-time match highlighting.
Compare two text blocks and highlight line-by-line differences.
Write and preview Markdown with live rendering.
Autosaving plain-text editor with word count, Find & Replace, and .txt download. Nothing leaves your browser.
Real-time words, characters, sentences, paragraphs, reading time, and keyword density analysis.
Convert HTML or pasted rich text to GitHub Flavored Markdown. Tables, strikethrough, task lists supported.
Convert text to camelCase, PascalCase, snake_case, SCREAMING_SNAKE, kebab-case, Title Case, and 3 more formats. All 9 at once.
Complete HTTP status code reference with descriptions. Search and filter all 1xx, 2xx, 3xx, 4xx, and 5xx codes.
Count tokens for GPT-4o, GPT-4, GPT-3.5, Claude, and Gemini. See context window usage and estimated API cost.
Build and validate cron expressions with a human-readable description.
Format and beautify SQL queries for MySQL, PostgreSQL, SQLite, T-SQL, and Standard SQL. Keyword casing control.
Format, beautify, and minify XML online. Validates XML structure and supports custom indentation.
Format, beautify, and minify CSS code online. Shows byte reduction percentage on minify.
Optimize and minify SVG in your browser. Strip metadata, round precision, and export as SVG, data URI, or Base64. See bytes saved.
