A complete directory of free developer tools that run entirely in your browser. No signup, no downloads, no data sent to any server. Bookmark this page and come back whenever you need to format JSON, encode Base64, generate passwords, convert images, or find the right AI prompt.
Developer Utility Tools
These tools handle the everyday tasks developers face: formatting data, encoding values, generating secure credentials, and managing design tokens.
1. JSON Formatter & Validator
Paste messy, minified JSON and get clean, indented output instantly. Validates syntax and highlights errors so you never debug a trailing comma again.
Open JSON Formatter- Format and pretty-print JSON data
- Validate syntax with error highlighting
- Minify JSON for production use
- Handle large files without browser lag
Read the full JSON formatting guide →
2. Base64 Encoder / Decoder
Encode text and files to Base64 or decode Base64 strings back to readable text. One-click, no command line needed.
Open Base64 Tool- Encode text to Base64 format
- Decode Base64 strings instantly
- Perfect for data URIs and API tokens
- Supports UTF-8 and binary data
Read the Base64 encoding guide →
3. Secure Password Generator
Generate cryptographically random passwords with customizable length, character types, and complexity rules. Runs entirely client-side.
Open Password Generator- Customizable length (8-128 characters)
- Toggle uppercase, lowercase, numbers, and symbols
- Cryptographically secure randomness
- Passwords never leave your browser
Read the password security guide →
4. Color Picker & Converter
Convert between HEX, RGB, and HSL color formats in one click. Perfect for matching design specs and building color palettes.
Open Color Picker- Convert between HEX, RGB, and HSL
- Visual color picker with preview
- Copy values to clipboard instantly
- Great for CSS, design tools, and development
5. Lorem Ipsum Generator
Generate placeholder text with customizable word count, paragraph count, or sentence count. Essential for mockups and wireframes.
Open Lorem Ipsum Generator- Generate paragraphs, sentences, or words
- Customizable output length
- Copy to clipboard in one click
- Classic lorem ipsum format
Compare lorem ipsum generators →
6. Word & Character Counter
Paste any text and get instant word count, character count (with and without spaces), and estimated reading time.
Open Word Counter- Word count and character count
- Character count with and without spaces
- Estimated reading time
- Essential for blog writers and content creators
Read the text analysis tools guide →
7. URL Encoder / Decoder
Encode special characters in URLs or decode percent-encoded strings. Essential for working with query parameters and API endpoints.
Open URL Encoder- Encode URLs with special characters
- Decode percent-encoded strings
- Handle query parameters safely
- Prevents broken links and API errors
8. Markdown Previewer
Write Markdown on the left, see rendered HTML on the right. Perfect for testing README files and documentation before committing.
Open Markdown Previewer- Live side-by-side preview
- Supports GitHub-flavored Markdown
- Great for README files and docs
- Instant rendering as you type
Image Tools
Convert, resize, and compress images right in your browser. Supports PNG, JPG, WebP, GIF, BMP, and more.
Image Converter — PNG, JPG, WebP & More
Convert images between formats instantly. WebP support for faster websites, PNG for lossless quality, JPG for photos.
Open Image Converter- Convert between PNG, JPG, WebP, GIF, BMP, ICO
- Batch conversion support
- No file size limits
- All processing happens in your browser
Read the image converter guide →
Image Resizer
Resize images to exact dimensions for web, social media, or custom projects. Set width, height, or scale percentage.
Open Image Resizer- Set custom width and height
- Maintain aspect ratio option
- Preset sizes for social media platforms
- High-quality output with no re-compression artifacts
Image Compressor
Reduce image file size without noticeable quality loss. Optimize your images for faster page loads.
Open Image Compressor- Lossy and lossless compression modes
- Adjustable quality slider
- See file size reduction in real time
- Perfect for web performance optimization
AI & Productivity Tools
Supercharge your workflow with AI prompts designed for developers, writers, and anyone who wants to work smarter.
100+ ChatGPT Prompts for Productivity
A curated collection of over 100 AI prompts organized by category — writing, coding, research, productivity, and more. Ready to copy and paste.
Browse AI Prompts- 100+ prompts across 10+ categories
- Writing, coding, debugging, research, and more
- Copy to clipboard with one click
- Updated regularly with new prompts
Read the prompt engineering guide →
Quick Comparison Table
| Tool | Category | Privacy | Link |
|---|---|---|---|
| JSON Formatter | Data | Client-side | Try it |
| Base64 Encoder | Encoding | Client-side | Try it |
| Password Generator | Security | Client-side | Try it |
| Color Converter | Design | Client-side | Try it |
| Image Converter | Image | Client-side | Try it |
| Image Resizer | Image | Client-side | Try it |
| Image Compressor | Image | Client-side | Try it |
| AI Prompt Pack | Productivity | Static | Browse |
Why Choose These Tools?
All tools in this directory share these principles:
- 100% Free — no premium tiers, no hidden costs, no paywalls
- No Signup Required — open the page and start using it immediately
- Privacy-First — all processing happens in your browser; no data is sent to any server
- No File Size Limits — process files of any size without restrictions
- Fast — instant results with no upload or download wait times
- Works Everywhere — runs on any device with a modern browser
Try All Developer Tools
8 free tools in one place. No signup, no tracking, no limits.
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