💻 Free Developer Tools — JSON Formatter, Base64 Encoder & More
Free online developer utilities. Format JSON, encode Base64, generate UUIDs, test regex, minify CSS, generate QR codes, and more. All tools run in your browser — no signup required.
26 tools
JSON Formatter
Format, validate, and beautify JSON with syntax highlighting and collapsible tree view. Minify to a single line for production. Catches syntax errors with line numbers.
Base64 Encoder/Decoder
Encode text to Base64 and decode Base64 back to readable text. Works with standard Base64 and URL-safe variants. Quick way to embed data in URLs or decode API responses.
URL Encoder/Decoder
Encode special characters in URLs and decode percent-encoded strings back to normal text. Handles full URLs or individual components. Essential for working with query parameters and form data.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text. Also supports MD5 for legacy checks. Compare two hashes side by side to verify file integrity.
UUID Generator
Generate random UUID v4 identifiers. Click to copy, generate multiple at once with separator options. Good for database keys, test fixtures, or any time you need a unique ID.
Regex Tester & Converter
Test regular expressions, replace with regex, extract matches, and generate code snippets for 10 programming languages.
CSS Minifier
Minify CSS by stripping whitespace, comments, and unnecessary characters. Also beautifies minified CSS back to readable format. Paste your stylesheet and toggle between compact and readable.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Shows UTC and local time side by side. Pick a date to get its timestamp.
Password Generator
Generate strong random passwords with adjustable length and character sets — uppercase, lowercase, numbers, symbols. Shows estimated strength. One click to copy or regenerate.
HTML Entity Encoder
Encode special HTML characters to entities and decode entities back to plain text. Covers all named entities plus numeric codes. Paste raw HTML to escape it for safe embedding.
JSON to CSV Converter
Convert JSON arrays to CSV format. Handles nested objects by flattening keys. Configure delimiter and download. Quick way to get API responses into Excel or Google Sheets.
CSV to JSON Converter
Convert CSV data to structured JSON. Auto-detects headers and generates either an array of objects or a column-based structure. Handles quoted fields and different delimiters.
Image to Base64
Convert any image to a Base64 data URI string. Drag and drop, get the encoded string with the correct MIME type prefix. Copy directly into CSS or HTML.
Random Name Generator
Generate random names with options for gender, region, and quantity. Pulls from large name databases. Useful for character creation, test accounts, and placeholder data.
YouTube Thumbnail Size Tool
Preview how your thumbnail looks at different sizes — full HD, search results, and sidebar. Overlay text on your image to test readability. Includes size guide for best click-through rates.
MD5 Hash Generator
Generate MD5 hashes from any text input. Shows both lowercase and uppercase versions. While MD5 is not secure for passwords, it remains widely used for checksums and cache keys.
QR Code Generator
Generate QR codes from URLs, text, email addresses, or phone numbers. Download as PNG. Adjustable size and error correction. Preview scans in real time before downloading.
Free Morse Code Translator — Text to Morse & Morse to Text
Convert text to Morse code and decode Morse code back to text. Supports A-Z, 0-9, and common symbols. Includes audio playback. Free, no signup.
Color Contrast Checker
Check WCAG 2.1 contrast ratios between two colors. Ensure your text meets AA and AAA accessibility standards with instant pass/fail results.
Base64 to Image Converter
Convert Base64 encoded strings back to image files. Preview and download PNG, JPEG, GIF, WebP, or SVG images instantly. Auto-detects image format.
Code Formatter
Format and beautify JSON, JavaScript, CSS, and HTML code. Make minified or messy code readable with one click. Supports 4 languages.
SVG Minifier
Minify SVG code by removing comments, whitespace, XML declarations, and unnecessary metadata. Reduce file size for faster-loading web pages.
HTML to Markdown Converter
Convert HTML code to clean Markdown format instantly. Tables, lists, links, and formatting all preserved. Perfect for migrating content to documentation.
QR Code Scanner
Scan QR codes using your device camera, or decode them from uploaded or pasted images. Fast, private, and works entirely in your browser.
JWT Decoder
Decode JWT tokens instantly — inspect header, payload, and signature. See algorithm, issued-at and expiration timestamps in human-readable format. All decoding happens in your browser, your tokens never leave your device.
Cron Expression Parser
Parse cron expressions and see when your scheduled jobs will run. Get human-readable descriptions and the next 10 execution times. Supports all 5-field standard cron syntax — no server needed.