Free online developer and conversion tools
Free browser-based tools for JSON, YAML, CSV, Base64, images, text, code, security, and developer workflows. Fast, practical, and no signup required.
Format & Code Conversion
- JSON, YAML, XML & CSV Converter — Convert between JSON, YAML, XML, and CSV formats
- JSON to Code Models — Convert JSON to C#, TypeScript, Java, Python, Go, Kotlin, and more
- Number Base Converter — Convert between Decimal, Binary, Octal, and Hexadecimal
Encoding & Decoding
- Base64 Encoder & Decoder — Encode and decode Base64 data
- URL Encoder & Decoder — Encode and decode URLs
- Text & Hex Converter — Convert text to Hex and vice versa
- Text & Binary Converter — Convert text to Binary and vice versa
Generators
- UUID Generator — Generate UUIDs (v1, v4)
- Hash Generator — Generate MD5, SHA-1, SHA-256 hashes
- Lorem Ipsum Generator — Generate Lorem Ipsum placeholder text
- QR Code Generator — Generate QR Codes
- Placeholder Text — Generate Lorem, Bacon, Hipster, and Corporate Ipsum
- Mock Data Generator — Generate mock data (JSON, CSV, SQL) based on schema
- Favicon Generator — Generate favicons and ICO files from images
Text & Content
- Text Case & Cleanup — Change case, remove duplicates, and more
- Slug Generator — Generate URL-friendly slugs
- Text Encryption & Decryption — Encrypt and decrypt text (AES, DES, etc.)
- Markdown Editor — Markdown editor with live preview and HTML export
- ASCII Art Generator — Generate ASCII art from text
- Diff Checker — Compare and find differences between two texts
- Word Counter — Count words, characters, sentences, and paragraphs
- HTML Entity Encoder & Decoder — Encode and decode HTML entities
- String Escape & Unescape — Escape and unescape strings for various formats
- Regex Tester — Test regular expressions with live matching
Images & Files
- Image Converter — Convert images between formats (PNG, JPG, WEBP)
- Resize, Crop & Compress Images — Resize, compress, rotate, and crop images
- Image Merger — Merge multiple images in split layouts (2 or 4 images)
- SVG Optimizer — Optimize and minify SVG files
- Image Scan Effect Generator — Make JPG and PNG images look like scanned documents with adjustable effects
Date & Time
- Unix Timestamp Converter — Convert timestamps and dates
- Cron Expression Builder — Parse and generate cron expressions
Color & Design
- Color Converter — Convert colors (Hex, RGB, HSL)
- Color Palette & Contrast — Generate color palettes and check contrast
Code & Developer Tools
- Git Helpers — .gitignore generator, commit validator, URL parser
- JSON Beautifier & Validator — Format, validate, safely repair, minify, and sort JSON locally in your browser
- Code Formatter — Format and minify JavaScript, HTML, and CSS
- Regex Pattern Library — Common regex patterns and tester
- HTML Viewer & Playground — Build and preview HTML, CSS, and JavaScript, then export a single file or project ZIP
Data & SQL
- JSON Schema Validator — Validate JSON against Schema
- SQL Formatter — Format and validate SQL queries
- CSV Toolkit — CSV to JSON, Transpose, and more
- Advanced Data Format Converter — Convert between JSON, YAML, CSV, XML, and TOML formats with advanced options
- CSV to SQL Generator — Convert CSV data to SQL schema with intelligent type inference and multiple database dialects
API & Network
- API Test Builder — Create, organize, send, import, and export reusable browser-based API request collections
- HTTP Request Tester — Send HTTP requests and view responses
- WebSocket Tester — Test WebSocket connections
- DNS Lookup — Perform DNS lookups and troubleshooting
Security & Tokens
- JWT Decoder, Generator & Verifier — Decode, verify, and generate JWTs
- Password Generator — Generate secure passwords with customizable options
- Let’s Encrypt Setup Guide — Generate validated Certbot setup steps for Nginx, Apache, or manual challenges
- Self-Signed Certificate Command — Create self-signed SSL certificates
Focused conversion guides
- JSON to YAML Converter — Convert JSON to readable YAML online with a fast browser-based converter. Validate the input, preserve nested data, and copy the YAML output.
- YAML to JSON Converter — Convert YAML to valid JSON online. Check indentation errors, preserve nested structures, and copy formatted JSON in your browser.
- JSON to CSV Converter — Convert arrays of JSON objects to CSV online. Generate spreadsheet-ready rows with consistent headers and downloadable output.
- CSV to JSON Converter — Convert CSV rows to structured JSON online. Parse headers, quoted values, and tabular data directly in your browser.
- CSV to SQL Converter — Convert CSV data to CREATE TABLE and INSERT statements online with type inference and support for multiple SQL dialects.
- Base64 Encoder — Encode UTF-8 text as Base64 online. Generate a copy-ready Base64 value locally in your browser without signup.
- Base64 Decoder — Decode Base64 to readable UTF-8 text online. Validate and inspect encoded values locally in your browser.
- Unix Timestamp to Date Converter — Convert Unix timestamps to readable UTC and local dates online, with support for seconds and milliseconds.
- PNG to WebP Converter — Convert PNG images to WebP online in your browser and download a web-ready image while preserving transparent pixels when supported.
- HEX to RGB Color Converter — Convert HEX color codes to RGB values online with instant validation and a visual color preview.