KitBoxDev: Fast, Private, In-Browser Tools for Developers
Free client-side utilities for developers, DevOps, and electrical engineers with no data uploads or accounts.
About KitBoxDev: Fast, Private, In-Browser Tools for Developers
KitBoxDev is a collection of fast, free utilities for developers, DevOps engineers, and electrical engineers. The site includes 35 tools across developer, operations, and electronics workflows, all designed to run directly in the browser without accounts or uploads.
Its developer tools cover tasks such as QR code generation and reading, JWT debugging, Base64 conversion, hashing, JSON formatting, UUID generation, URL encoding, regex testing, and text scrambling. The DevOps section includes cron parsing, CIDR and subnet calculation, chmod permissions, uptime and SLA calculation, Kubernetes resource conversion, YAML to JSON conversion, dotenv conversion, htpasswd generation, docker run to Compose conversion, and certificate or CSR decoding.
KitBoxDev also includes electrical calculators for Ohm’s law, resistor color codes, voltage dividers, LEDs, 555 timers, filters, wire gauge, PCB trace width, and logic gates. The site emphasizes client-side processing, browser Web Crypto, offline use after loading, and keyboard-friendly navigation.
Features
- JWT debugger with signing and verification using multiple algorithms
- Cron expression parser displaying next ten firings in local and UTC time
- Ohm’s law calculator solving for voltage, current, resistance, or power
Use cases
- Quickly generate or scan QR codes without uploading data
- Validate and decode certificates or CSR files in-browser
- Calculate PCB trace width for current and temperature rise offline
Screenshots
Frequently asked questions
Does KitBoxDev upload my data to a server?
No, all tools run entirely in the browser with no data sent to any server.
Can I use KitBoxDev offline?
Yes, once loaded, the site continues to work offline as a progressive web app.
How does KitBoxDev handle cryptographic operations?
It uses the browser's native Web Crypto API rather than bundled cryptographic code.
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