Free, privacy-friendly browser tools for everyday Linux, networking, security, automation and system administration tasks.
Live site: admintoolkit.lepczynski.it
- CIDR Calculator — IPv4 network, broadcast, host range, subnet mask and wildcard mask.
- chmod Calculator — visual Linux permissions with numeric and symbolic output.
- Secure Password Generator — configurable passwords using the browser cryptography API.
- Cron Generator and Parser — build or decode five-field Unix cron expressions and calculate the next five runs.
- Unix Timestamp Converter — convert between dates, Unix seconds, milliseconds, UTC and local time.
- Base64 Encoder and Decoder — UTF-8 and URL-safe Base64 conversion.
- Time Zone Converter — synchronized CET/CEST, HKT and Zulu clocks with additional IANA zones.
- JSON ⇄ YAML Converter — local conversion for JSON-compatible YAML documents.
- Static HTML, CSS and JavaScript with no build step.
- No application backend, user account, cookies or analytics.
- Calculations are performed locally in the browser.
- Installable PWA with offline support after the first successful visit.
- Separate, shareable and indexable URL for every tool.
- Automatic deployment from GitHub with Cloudflare Workers Builds.
From the repository root:
python3 -m http.server 8080 --directory publicThen open http://localhost:8080/.
The browser toolkit is a companion to the offline ESP32 Pocket Admin Toolkit:
wrangler.jsonc publishes the public/ directory as static Cloudflare Worker assets. No build command is required.
MIT License. See LICENSE.
Created by Wojciech Lepczyński.