Developer Tools

Fast, free, and privacy-focused. Every tool runs 100% in your browser — no data ever leaves your device.

⚡ Instant•🔒 Private•🆓 Free

Encode / Decode

Base64 Encode/Decode

Encode text to Base64 or decode Base64 to text instantly

URL Encode/Decode

Encode or decode URLs and query string parameters

Decode and inspect JSON Web Tokens (JWT) header and payload

HTML Entity Encode/Decode

Encode special characters to HTML entities or decode them back

Formatters

Format, validate, and minify JSON data with syntax highlighting

Minify CSS code to reduce file size for production

JavaScript Minifier

Minify JavaScript code to reduce file size for production

Format and beautify SQL queries with proper indentation

Generators

Generate random UUIDs (v4) in bulk with one click

Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences, or words

Password Generator

Generate strong, random passwords with customizable length and character sets

Cron Expression Builder

Build or parse cron expressions with human-readable descriptions and next run times

Favicon Generator

Generate favicons from text, emoji, or image in all required sizes

Converters

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

Color Converter

Convert colors between HEX, RGB, HSL, and HSB formats

Convert between YAML and JSON formats instantly

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal

JSON → TypeScript / Zod

Convert JSON to TypeScript interfaces or Zod validation schemas

TOML Editor / Converter

Parse, validate, and convert TOML to JSON, YAML, or vice versa

Compose → K8s Converter

Convert Docker Compose files to Kubernetes Deployments, Services, and ConfigMaps

JSON ↔ CSV Converter

Convert between JSON arrays and CSV with nested object flattening

SQL ↔ MongoDB Translator

Translate SQL queries to MongoDB and vice versa with syntax highlighting

Terraform / HCL Formatter

Format and validate Terraform HCL code with diff preview

Text Tools

Test regular expressions against text with real-time match highlighting

Markdown Preview

Write Markdown and see a live rendered preview side by side

Compare two texts and find differences with side-by-side or unified view

Text Case Converter

Convert text between camelCase, snake_case, UPPER, lower, Title, and more

Word & Character Counter

Count words, characters, sentences, and paragraphs in your text

ASCII / Unicode Explorer

Browse ASCII/Unicode tables, search characters, and look up code points

Mermaid Diagram Editor

Write Mermaid diagrams with syntax highlighting, templates, and live preview

HTTP Status Codes

Interactive HTTP status code reference with descriptions, causes, and examples

Crypto

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text

SRI Hash Generator

Generate Subresource Integrity hashes for scripts and stylesheets

AI Tools

LLM Token Counter

Estimate token counts and API costs for GPT-4o, Claude, Gemini, and more

AI Model Comparison

Compare AI models side-by-side — pricing, context windows, capabilities, and cost calculator

Prompt Template Builder

Build structured prompts with variables, roles, and export to OpenAI/Anthropic API format

Function Call Generator

Generate OpenAI/Anthropic/Gemini function calling schemas from JSON

System Prompt Analyzer

Analyze AI system prompts for cost, structure, injection risks, and best practices

Structured Output Validator

Validate AI model JSON output against a JSON Schema with detailed error paths

Privacy & Compliance

Privacy Policy Generator

Generate a comprehensive, customizable privacy policy for your website or app

robots.txt Generator

Generate robots.txt files with visual controls to block AI crawlers and bots

Build Content Security Policy headers with an interactive visual editor

GDPR Request Generator

Generate GDPR data access, deletion, and portability request letters in EN/DE

CORS Header Generator

Build CORS headers with output for Express, nginx, Apache, Next.js, and more

SEO Tools

SEO / Meta Tag Preview

Preview how your page looks in Google, Twitter, Facebook, LinkedIn, Slack, and Discord

CSS Tools

CSS Specificity Calculator

Calculate and compare CSS selector specificity with visual breakdown

CSS Animation Generator

Visual CSS keyframe animation builder with live preview and code export

Tailwind ↔ CSS Converter

Convert between Tailwind CSS classes and regular CSS with responsive/state support

SVG Optimizer & Viewer

View, optimize, and convert SVG to React components with size comparison

Developer Tools

Parse, edit, diff, and export .env files with duplicate detection

CSV Viewer & Editor

Parse, edit, sort, filter CSV data and export as JSON, TSV, or Markdown

Semver Calculator

Test semver ranges, compare versions, and explore version range syntax

Git Command Builder

Interactive git command constructor with 40+ operations and explanations

.gitignore Generator

Generate .gitignore files for any language, framework, or IDE

README Generator

Build professional README.md files with badges, sections, and templates

GitHub Actions Validator

Validate GitHub Actions workflow YAML with error detection and best practices

Dockerfile Linter

Lint Dockerfiles for best practices, security issues, and optimization tips

OpenAPI Validator

Validate and visualize OpenAPI/Swagger specs with endpoint cards and schema browser

Changelog Generator

Generate changelogs from git commits using conventional commit format

package.json Analyzer

Analyze package.json for issues, typosquatting risks, and dependency insights