The Essential Developer Toolbox
Format JSON, generate hashes, encode Base64, test regex, preview HTML, and supercharge your development workflow online for free. All processing happens locally in your browser whenever technically possible. No uploads. No registration.
Featured Tools
JSON Formatter
Format and validate JSON online for free. Pretty-print, minify, and validate JSON data instantly in your browser.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes online for free. Hash text strings using the Web Crypto API in your browser.
Password Generator
Generate strong, secure passwords online for free. Customize length, uppercase, lowercase, numbers, and symbols to create unbreakable passwords.
UUID Generator
Generate UUID v4 (random) identifiers online for free. Create one or more UUIDs instantly for use in databases, APIs, and development.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings online for free. Convert text and data to Base64 format instantly in your browser.
URL Encode / Decode
URL-encode or decode strings online for free. Properly encode special characters for use in URLs and query parameters.
Slug Generator
Generate URL-friendly slugs from text online for free. Convert any text into clean, SEO-optimized URL slugs instantly.
HTML Previewer
Preview HTML code live online for free. Write HTML on the left and see the rendered result on the right in real time.
Regex Tester
Test regular expressions online for free. Write regex patterns, toggle flags, and see matches highlighted in real time.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa online for free. Supports seconds and milliseconds epoch formats.
All Developer Tools
Image to Base64
Convert images to Base64 encoded strings online for free. Perfect for embedding images directly in HTML, CSS, or JavaScript.
Base64 to Image
Convert Base64 encoded strings back to images online for free. Decode and download your images instantly.
Number Base Converter
Convert numbers between different bases online for free. Supports binary, octal, decimal, hexadecimal, and base-36 conversion.
CSS Unit Converter
Convert between CSS units (px, rem, em, %) online for free. Calculate responsive typography and layout values instantly.
JWT Decoder
Decode JWT tokens online for free. View the header and payload of any JSON Web Token in a readable format. No server-side verification.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text online for free. Customize the number of paragraphs and words per paragraph for your designs.
Color Converter
Convert colors between HEX, RGB, and HSL formats online for free. Preview colors visually with real-time conversion and shade previews.
Benefits
Streamlined Workflow
Access essential dev utilities without leaving your browser. No context switching needed.
Cryptographically Secure
Password generators and hashers use the Web Crypto API for enterprise-grade security.
Works Offline
Once loaded, many tools work without an internet connection — perfect for remote work.
Zero Data Leakage
Sensitive data like passwords, tokens, and code stay in your browser. No server round-trips.
Who is this collection for?
Frequently Asked Questions
Are these developer tools free?▼
Yes. All developer tools are completely free with no usage limits or premium tiers.
Is my code data safe?▼
Yes. Code, passwords, and tokens are processed entirely in your browser using the Web Crypto API.
Can I use these offline?▼
After the initial page load, many tools work offline since everything runs client-side.
Do I need to install anything?▼
No. Every tool runs directly in your browser. No npm, no extensions, no setup required.
Related Collections
Text Tools
Count words, convert case, find and replace, sort lines, remove duplicates, and analyze text online for free. All processing happens locally in your browser whenever technically possible. No uploads. No registration.
SEO Tools
Generate meta tags, preview SERP snippets, create sitemaps, analyze content, and optimize your website for search engines online for free. All processing happens locally in your browser whenever technically possible. No uploads. No registration.
Calculators
Calculate BMI, age, percentages, loans, tips, discounts, and more online for free. All processing happens locally in your browser whenever technically possible. No uploads. No registration.
Popular Tools
Most used tools across all collections
Image Compressor
Compress JPEG, PNG, and WebP images online for free. Reduce file size while maintaining quality with adjustable compression settings.
Image Resizer
Resize images online for free. Change image dimensions by specifying width and height with an optional locked aspect ratio.
Crop Image
Crop images online for free. Select a region of your image and remove unwanted areas with precision.
JPG to WEBP
Convert JPG images to WebP format online for free. Reduce file size while maintaining visual quality using modern compression.