28 TOOLSDeveloper Tools

Free Online Developer Tools

JSON formatters, Base64 encoders, UUID generators, regex testers and more — all the tools developers use daily, free and instant.

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Developer Tools

All Developer Tools

28 free tools for developers, engineers, and technical professionals.

JSON Formatter
Format, validate and minify JSON with syntax highlighting.
  • Pretty-print and minify JSON
  • Validate JSON syntax
  • Error highlighting
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Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings instantly.
  • Encode and decode Base64
  • URL-safe Base64 option
  • Binary file support
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URL Encoder/Decoder
Encode or decode URL strings and query parameters.
  • URL percent-encoding
  • Component encoding mode
  • Batch URL encoding
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CSV to JSON Converter
Convert CSV spreadsheet data to JSON arrays.
  • Auto-detect CSV headers
  • Nested JSON output option
  • Custom delimiter support
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UUID Generator
Generate random UUID v4 identifiers instantly.
  • RFC 4122 UUID v4
  • One-click copy
  • Multiple UUID generation
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JWT Decoder
Decode and inspect JSON Web Tokens without a secret.
  • Header, payload, signature view
  • Expiry time display
  • Pretty JSON output
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Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
  • MD5, SHA-1, SHA-256, SHA-512
  • Real-time hashing
  • One-click copy
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XML Formatter
Format, validate and minify XML code.
  • Pretty-print XML
  • Minify XML output
  • Syntax validation
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YAML ↔ JSON Converter
Convert between YAML and JSON formats instantly.
  • YAML to JSON conversion
  • JSON to YAML conversion
  • Preserves data types
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JSON to CSV Converter
Convert JSON arrays to CSV spreadsheets.
  • Flatten nested JSON
  • Custom CSV delimiter
  • Download as .csv file
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SQL Formatter
Format and beautify SQL queries with keyword highlighting.
  • Multi-dialect SQL support
  • Keyword capitalisation
  • Indentation control
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Regex Tester
Test and debug regular expressions with live match highlighting.
  • Live match highlighting
  • Capture group display
  • Global and multi-line flags
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HTML to Markdown
Convert HTML code to clean Markdown format.
  • Preserves structure
  • Handles tables and lists
  • Code block detection
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Markdown to HTML
Convert Markdown to HTML with live preview.
  • GitHub Flavored Markdown
  • Live HTML preview
  • Copy HTML output
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Slug Generator
Convert any text to URL-friendly slugs.
  • Remove special characters
  • Custom separator
  • Lowercase output
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HTML Entity Encoder
Encode and decode HTML entities.
  • Encode special characters
  • Decode HTML entities
  • Named entity support
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Cron Expression Generator
Build and explain cron job schedules visually.
  • Visual cron builder
  • Human-readable explanation
  • Common schedule presets
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Number Base Converter
Convert numbers between binary, decimal, hex, and octal.
  • Binary, decimal, hex, octal
  • Instant conversion
  • Large number support
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Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
  • Unix timestamp to date
  • Date to Unix timestamp
  • UTC and local time
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Text to Binary
Convert text to binary code and back.
  • ASCII to binary conversion
  • Binary to text decoding
  • Space-separated output
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Image to Base64
Convert images to Base64 data URIs in your browser.
  • PNG, JPG, GIF, WebP support
  • Data URI output
  • No upload to server
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UUID Bulk Generator
Generate up to 1000 UUIDs at once.
  • Generate 1–1000 UUIDs
  • One-click copy all
  • Download as text file
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Markdown Cheatsheet
Interactive Markdown reference with live editor.
  • Full syntax reference
  • Live editor preview
  • Copy examples instantly
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Code Beautifier
Format HTML, CSS, JavaScript, SQL, XML, and JSON.
  • 6 language support
  • Custom indentation
  • Minify option
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CSS Flexbox Generator
Build flexbox layouts visually with a live preview and copy the generated CSS code.
  • All flex properties
  • Live preview
  • Preset layouts
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CSS Grid Generator
Create CSS Grid layouts visually with column/row controls and a live preview.
  • Column & row controls
  • Gap slider
  • Preset grids
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CSS Animation Generator
Build CSS keyframe animations visually with full control over transforms, timing, and easing.
  • Keyframe editor
  • Live preview
  • Preset animations
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Favicon Generator
Generate a favicon from text or initials with custom colors and shapes, downloadable as PNG.
  • Canvas-based
  • Custom colors
  • PNG download
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