Free Online Developer Tools
Essential utilities every developer needs — from generating unique identifiers and computing cryptographic hashes to formatting and validating JSON. All tools are free, private, and work instantly in your browser with zero setup.
Instant Processing
Results in milliseconds — no waiting, no loading screens
Secure & Private
Client-side processing — data never leaves your device
Bulk Operations
Generate up to 1,000 items at once for batch workflows
Works Everywhere
Desktop, tablet, or mobile — zero setup required
Available Developer Tools
UUID Generator
Generate UUID v4 identifiers in bulk with formatting options.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.
JSON Formatter & Validator
Format, validate, minify, and explore JSON data with real-time error detection.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings instantly with UTF-8 and URL-safe support.
URL Encoder / Decoder
Encode or decode URLs and query strings with percent-encoding. Supports full Unicode.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, and multiple timezones.
Color Picker & Converter
Pick and convert colors between HEX, RGB, HSL, and HSV with live preview, harmony palettes, and shades.
Regex Tester
Test and debug regular expressions with real-time highlighting, capture groups, find & replace, and presets.
Why Use Online Developer Tools?
Modern software development demands speed and accuracy. Whether you're building APIs, managing databases, or debugging distributed systems, having the right utilities at your fingertips saves hours of manual work. Zutily offers 8 essential developer tools — all fast, reliable, and accessible from any device.
UUID & Hash Generation: Generate UUIDs (v1, v4, v7, Nil, GUID) in bulk up to 1,000 for databases, APIs, and microservices. Compute MD5, SHA-1, SHA-256, and SHA-512 hashes for data integrity, checksums, and security.
JSON, Base64 & URL Tools: Format, validate, and minify JSON with tree view and error detection. Encode and decode Base64 strings with UTF-8 and URL-safe support including file-to-Base64. Encode/decode URLs with a visual query string builder.
Timestamp, Color & Regex: Convert Unix timestamps to dates and vice versa with timezone support. Pick and convert colors between HEX, RGB, HSL, and HSV with harmony palettes and WCAG contrast checking. Test regular expressions with real-time highlighting, capture groups, find & replace, and common presets.
100%
Client-Side Processing
Your data stays on your device
Zero
Setup Required
Works instantly in any browser
1,000+
Batch Generation
Generate up to 1,000 UUIDs at once
Common Use Cases
API Development
Generate unique request IDs, correlation tokens, and API keys for your RESTful and GraphQL services. Use hash functions to verify webhook payloads and create HMAC signatures.
Database Management
Seed databases with unique primary keys, generate test data, and create idempotency keys for distributed transactions. UUID v4 avoids sequential ID collisions in multi-region setups.
Security & Verification
Compute file checksums to verify download integrity, hash sensitive data before storage, and generate tokens for authentication flows and CSRF protection.
Testing & QA
Create bulk test identifiers, verify hash outputs in unit tests, and generate reproducible test fixtures for CI/CD pipelines without external dependencies.
In-Depth Developer Guides
Unix Timestamps Explained
Epoch time conversions, the Y2K38 problem, and time handling best practices across languages.
Read guideColor Models: HEX, RGB, HSL & HSV
How color models work, converting between formats, generating harmonies, and WCAG contrast.
Read guideMaster Regular Expressions
Regex syntax, flags, capture groups, lookaheads, common patterns, and performance tips.
Read guideFrequently Asked Questions
Quick answers to common questions