Free IT Tools & Assessments
Interactive tools to help you choose the right technology, plan your career, and assess your skills — all completely free.
Linux Distro Finder
Answer 6 quick questions and discover which Linux distribution is perfect for your needs, experience level, and goals.
Start NowIT Career Path Calculator
Map your personalized IT career path from where you are now to where you want to be, with book recommendations at every step.
Start NowLinux Skill Assessment
Test your Linux knowledge across 5 key areas and get a detailed skill report with personalized improvement recommendations.
Start NowServer Stack Advisor
Answer 6 questions about your project and get a personalized technology stack recommendation with alternatives and learning resources.
Start NowDevOps Readiness Assessment
Evaluate your DevOps maturity across 5 key areas: CI/CD, containers, infrastructure as code, monitoring, and culture.
Start NowCloud Provider Matcher
Answer 6 questions about your workloads and get a personalized recommendation between AWS, Azure, and Google Cloud.
Start NowFree Online Tools for Sysadmins, DevOps & Developers
Welcome to Dargslan Tools — a growing collection of free, browser-based utilities built for system administrators, DevOps engineers, security professionals, and developers. Every tool runs entirely in your browser (no data sent to our servers), works offline once loaded, and is built by engineers who needed the same utility themselves. No signup, no ads, no premium tier — just useful tools.
What's in the toolbox
- Network calculators — CIDR / subnet calculator, IP range expander, MAC address vendor lookup, MTU tester, and DNS lookup helpers.
- Encoding & hashing — Base64, URL encode/decode, JSON formatter and validator, JWT decoder, hash generators (MD5, SHA-1, SHA-256, SHA-512), and bcrypt verification.
- Cron & scheduling — cron expression builder, human-readable cron translator, next-run calculator, and timezone converter.
- Linux helpers — chmod calculator, umask explainer, regex tester (PCRE / POSIX / Go), and a quick reference for ANSI escape codes.
- Security utilities — password strength checker, secure password generator, SSH key fingerprint viewer, and a quick TLS / certificate inspector.
- Conversion tools — bytes / KB / MB / GB / TB / PB converter, epoch / Unix timestamp converter, color format converter (HEX / RGB / HSL).
Why browser-based tools
Every tool here runs as pure JavaScript in your browser. We never send your input to a server, so it's safe to paste real configuration files, JWTs, or password hashes — they never leave your machine. Once a tool's page is loaded, it works offline; bookmark the ones you use most and they're available even on a plane or behind a corporate proxy. We also publish the source code on GitHub for any tool where you'd want to verify that promise yourself.
Most online "free tools" sites are stuffed with ads, popups, and tracking scripts that defeat the purpose of a quick utility. Ours have none of that — no ads, no analytics on the tool pages, no popups asking you to subscribe after pasting a JWT. They load fast, work fast, and get out of your way.
Suggest a tool
Need a tool we don't have? Open a request via the contact page — we add the most-requested utilities first. Looking for deeper learning? Browse our eBook catalog, grab a free cheat sheet, or read the technical blog for in-depth tutorials on the same topics our tools cover.