Toolkit

Encode and decode Base64 strings instantly.

Encode and decode URL components. Handle special characters safely.

Encode and decode HTML entities. Keep special characters safe.

Format, minify, and validate JSON. Paste messy data, get clean output.

Write markdown on the left, see rendered HTML on the right. Live preview.

Beautiful code snippets with syntax highlighting. Pick a theme and language.

Validate YAML syntax, convert between YAML and JSON, pretty-print or minify.

Format, beautify, and minify SQL queries. Uppercase keywords, indent subqueries.

Create markdown tables visually with an interactive editor. Add rows, columns, and copy the result.

Generate Tailwind CSS class strings with live preview. Presets for cards, buttons, badges, and more.

Generate unique identifiers. Click to create, click to copy.

Generate placeholder text. Paragraphs, sentences, or words.

Generate cryptographic hashes. SHA-256, SHA-384, SHA-512, and SHA-1.

Build cron expressions visually. See next run times in plain English.

Calculate Unix file permissions. Convert between numeric and symbolic notation.

Generate .gitignore files from preset templates. Combine, customize, and download.

Generate meta tags and OG tags with live Google, Twitter, and Facebook previews.

Generate MCP server configs for Claude Code and Cursor. Pick servers, add keys, download.

Generate a CLAUDE.md config for Claude Code. Pick your stack, get a ready-to-use project file.

Generate production-ready Dockerfiles with multi-stage builds and best practices.

Define endpoints and generate a complete Express.js mock server. Copy or download.

Edit TOML with syntax highlighting. Validate and convert between TOML, JSON, and YAML.

Build git commands visually. Select operations, configure flags, and get plain-English explanations.

Generate conventional commit messages with type, scope, and body. Clean, consistent git history.

Build professional README.md files interactively. Toggle sections, reorder, and preview live.

Generate .env files with preset templates for Next.js, Vercel AI SDK, Clerk, Supabase, Stripe, and more.

Convert between hex, RGB, and HSL color formats. Live preview swatch.

Convert between Unix timestamps and human-readable dates.

Convert between px, rem, em, and viewport units.

Convert between camelCase, snake_case, kebab-case, and more.

Convert cURL commands to JavaScript, Python, Go, and more. Paste and go.

Paste JSON, get TypeScript interfaces, Zod schemas, and Python dataclasses.

Test regular expressions in real time. See matches highlighted as you type.

Compare two blocks of text side by side. See additions, removals, and changes.

Estimate token counts for AI models. See approximate costs.

Count words, characters, sentences, and more. Analyze any text.

Decode JSON Web Tokens. Inspect header, payload, and signature.

Analyze AI prompts for structure, cost, readability, and best practices. Improve before you ship.

Write AI prompts, get scored on clarity and specificity, see heuristic improvements, and copy the improved version.

Compare 8 AI coding agents side by side - features, pricing, context windows, and recommendations.

Test any API endpoint. Send requests, see response headers, body, timing, and status codes.

Estimate cost per request, day, and month across Claude, GPT-5, and Gemini. Compare two models with prompt-caching and batch-mode discounts.

Compare two AI prompts side by side with line-level diffs. Spot changes between prompt versions.

Paste your package.json and get instant analysis. Dependencies, stack detection, and health indicators.

Test robots.txt rules against URLs to verify allowed and disallowed paths for crawlers.

View and create tweets with live preview, code snippets, and image export.

The complete visual language - colors, typography, buttons, cards, and tokens.

74 free SVG logos for AI tools, languages, and infrastructure. Search, preview, copy.

Browse all pages on Developers Digest - blog posts, guides, tools, and more.