Dave Hill
About Me
Project Showcase
Tools
Contact Info
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SYS_ONLINE
About Me
Project Showcase
Tools
Contact Info
Tools
Browser-based utilities — no data leaves your machine.
Network
CIDR Calculator
Subnet masks, host ranges, broadcast from CIDR.
HTTP Header Analyzer
Cache, compression, and security header checks.
Developer
JSON Prettify
Format, minify, and validate JSON.
Regex Tester
Live match highlighting and capture groups.
JWT Decoder
Inspect header, payload, and expiry.
Text Diff Studio
Inline highlights, folding, fast navigation.
Utilities
Time Until
Countdown plus Unix epoch conversion.
PDF Toolkit
Rotate, merge, split, reorder — local only.
Gauge Face Generator
Printable SVG dial faces with custom ticks.