Developer Utilities
UUID generators, JWT decoders, regex testers, cron builders, timestamp converters, color converters, and CSS generators.
Tools in this section
19 total toolsUUID Generator
Generate random v4 UUIDs instantly — single or bulk.
GUID Generator
Generate globally unique identifiers in Microsoft GUID format.
Password Generator
Generate strong, cryptographically random passwords with custom rules.
JWT Decoder
Decode JWT tokens to view header, payload, and expiration claims.
JWT Generator
Create test JWT tokens with custom headers and payload claims.
Regex Tester
Test regex patterns with real-time matching, grouping, and replacement.
Regex Generator
Generate regex patterns from sample text or plain-language descriptions.
Cron Expression Generator
Build cron expressions visually with a plain-language schedule preview.
Cron Expression Translator
Convert cron expressions to readable plain-language descriptions.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable date/time.
Unix Timestamp Generator
Get the current Unix timestamp with live-updating display.
Timestamp to Date
Convert a Unix timestamp to a formatted date in any timezone.
Color Converter
Convert colors between HEX, RGB, HSL, CMYK, and more formats.
HEX to RGB
Convert HEX color codes to RGB values with live preview.
RGB to HEX
Convert RGB values to HEX color codes with live preview.
HEX to HSL
Convert HEX color codes to HSL values with live preview.
CSS Gradient Generator
Create linear, radial, and conic CSS gradients with live preview.
CSS Box Shadow Generator
Create CSS box-shadow values with visual controls and live preview.
CSS Border Radius Generator
Create custom CSS border-radius values with visual drag controls.
Why Use Developer Utilities on Alee Tools?
The Developer Utilities suite includes 19 focused browser-based tools designed to eliminate tedious file handling. Each tool runs locally on your machine using modern web standards including WebAssembly, Web Workers, and the HTML5 Canvas API.
Unlike cloud-based services that upload your personal data to remote servers, Alee Tools guarantees total client-side privacy. Your files never cross the network, zero logs are created, and your work completes in milliseconds with zero paywalls.
Zero File Uploads
Operations are isolated to your local browser session. Complete confidentiality guaranteed.
Instant Speed
Bypasses network bandwidth bottlenecks for instant conversions and calculations.
Free Forever
No subscription plans, no registration requirements, and no watermarks on your files.