Free Online Developer Tools & PDF Utilities
Professional free online developer tools: JSON formatter, regex tester, base64 converter, color picker, diff checker, cron generator, cURL generator, SQL formatter. Plus PDF merge, split, compress tools. No registration required, 100% secure and private.
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Free PDF Tools Online
Professional PDF manipulation tools for merging, splitting, compressing, and securing your documents. All processing happens in your browser - no data is sent to our servers.
Free Developer Tools Online
Essential coding utilities for developers: JSON formatter, regex tester, base64 converter, color picker, diff checker, cron generator, cURL generator, and SQL formatter. All tools work instantly in your browser.
JSON Formatter
Format and validate JSON data
Regex Tester
Test regular expressions in real-time
Base64 Converter
Encode and decode Base64 data
Color Picker
Pick colors and generate palettes
Diff Checker
Compare text and see differences
Cron Generator
Create and understand cron expressions
cURL Generator
Generate cURL commands from HTTP requests
SQL Formatter
Format and beautify SQL queries
CSS Beautifier
Format, minify and validate CSS code
HTML Formatter
Format, minify and beautify HTML code
UUID/GUID Generator
Generate, validate and format UUIDs/GUIDs
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Popular Free Developer Tools
DevTools Pro offers the most comprehensive collection of free online developer tools and PDF utilities available. Our tools are designed for web developers, programmers, software engineers, and IT professionalswho need reliable, secure, and fast solutions for their daily development tasks.
JSON Formatter & Validator
Format, validate, and beautify JSON data. Perfect for API development, data processing, and debugging JSON responses.
- • Syntax validation
- • Pretty formatting
- • Minification
- • Error highlighting
Regex Tester & Debugger
Test regular expressions in real-time with live matching, highlighting, and comprehensive flag support.
- • Real-time testing
- • Match highlighting
- • Flag explanations
- • Common patterns
Base64 Encoder/Decoder
Encode text and files to Base64, decode Base64 back to original format. Essential for data transmission and storage.
- • Text encoding
- • File support
- • Batch processing
- • Download results
Color Picker & Generator
Professional color picker with palette generation, accessibility checking, and multiple color format support.
- • Multiple formats (HEX, RGB, HSL)
- • Palette generation
- • Accessibility check
- • Contrast ratios
Text Diff Checker
Compare text files and see differences with line-by-line highlighting. Perfect for code reviews and document comparison.
- • Line-by-line comparison
- • Visual highlighting
- • Statistics
- • Export options
Cron Expression Generator
Create and understand cron expressions with human-readable descriptions and next occurrence predictions.
- • Quick presets
- • Human descriptions
- • Next occurrences
- • Syntax help
Frequently Asked Questions
Are these tools really free?
Yes, all our tools are completely free to use. No registration, no hidden fees, no premium tiers. We believe in providing essential developer tools at no cost.
Is my data secure?
Absolutely. All processing happens in your browser. Your files never leave your device and are never stored on our servers. Your privacy is our priority.
Do I need to install anything?
No installation required. All tools work directly in your web browser. Just visit the tool page and start using it immediately.
What file formats are supported?
Our PDF tools support all standard PDF files. Developer tools work with JSON, text, code, and various data formats. Check each tool's description for specific format support.
Why Choose DevTools Pro?
100% Secure
All processing happens in your browser. Files never leave your device.
Lightning Fast
Process your PDFs instantly with our optimized tools.
No Registration
Start using our tools immediately. No sign-up required.
Need More Advanced Features?
For professional use, batch processing, or advanced development tools, we recommend these premium solutions: