Toolbench
Small developer utilities that run entirely in your browser. No accounts, no uploads, no tracking scripts.
- Client-side only: values stay on your device
- Bookmark any tool; works offline after first load (subject to browser cache)
- Built for everyday engineering tasks
IDs & versions
- UUID v7 generator — time-ordered and random UUIDs
- ULID & NanoID generator — sortable and URL-safe IDs
- SemVer bump and compare — major / minor / patch / prerelease
- Slugify tool — ASCII-fold URL slugs
- SHA-256 hash generator — text and local files
Time & permissions
- Unix timestamp converter — epoch ↔ ISO
- Cron expression explainer — next runs UTC and local
- chmod calculator — octal ↔ rwx
Data & text
- JSON ↔ CSV converter
- YAML ↔ JSON converter
- Query string parser & builder
- Local JWT decoder — header/payload only, no verify
- .env linter — structure checks, no upload
- HTTP status codes — searchable 1xx–5xx reference
Front-end & repo
- CSS px ↔ rem converter
- gitignore generator — stack templates
Calculators
- All calculators — everyday math hub
- Percentage calculator
- Tip calculator
- Age calculator
- Time duration calculator
- Unit converter
- Discount & markup calculator
- BMI calculator
- Date difference calculator
- Hours & minutes calculator
- Split bill calculator
- Simple loan payment calculator
- Area & volume converter
16 developer tools + 12 calculators. Use HTTPS URLs with a trailing slash.