No installs. No sign-up. Fast, focused tools built for IT professionals and everyday users.
ITToolKit is a free collection of practical browser-based utilities for IT support technicians, network administrators, system administrators, students and everyday users who need quick answers without installing extra software. The site is designed around common support desk and field technician tasks: checking subnet ranges, planning VLAN address space, decoding suspicious strings, generating strong passwords, converting data formats and looking up Windows Event IDs during troubleshooting.
Unlike many generic converter websites, ITToolKit focuses on tasks that appear in real IT environments. A network technician may need to confirm the usable host range for a /26 subnet before configuring a switch. A help desk analyst may need to understand whether a Windows logon event is informational or security-relevant. A system administrator may need to decode a PowerShell -EncodedCommand during a malware review. These tools are built to make those jobs faster while keeping the page simple enough for beginners.
Most tools run entirely in your browser using client-side JavaScript. That means the text, IP addresses, card numbers, passwords, scripts and files you enter are processed locally on your own device. There is no account system, no paid tier and no upload requirement for normal use. The site is maintained by OnlineComputerTechnician.com, an IT support business serving homes and businesses across South East Melbourne since 2013.
Subnet Calculator: Enter an IPv4 address and CIDR prefix to calculate the network address, broadcast address, usable host range, subnet mask, wildcard mask and host count. This is useful before creating DHCP scopes, firewall rules, static routes or VLAN interfaces.
VLSM Subnet Planner: Add the required host counts for multiple networks and let the planner assign efficient subnet sizes. This helps reduce wasted address space and produces a cleaner address plan for small business networks, labs and study scenarios.
Windows Event ID Lookup: Search common Windows Event IDs and view plain-English meanings, severity guidance and troubleshooting notes. It is useful when reviewing Event Viewer logs, Active Directory sign-in activity, failed logons, service errors or script execution events.
Base64 Encoder / Decoder: Encode and decode Base64, URL and hexadecimal text. The PowerShell mode supports UTF-16LE decoding for -EncodedCommand, which is commonly seen in administration scripts and security investigations.
ITToolKit is intended to provide practical guidance and calculations, but it should not replace professional judgement. Always verify network changes before applying them to production routers, switches, firewalls or DHCP servers. For security-related results, compare the tool output with official logs, device documentation and your organisation's policies.
The site avoids collecting unnecessary user data. Tools are designed to complete the task in the browser and show clear results immediately. External services such as analytics and advertising may be used to understand traffic and support the free site, but tool inputs are not intentionally submitted to a server for processing.
When using generated passwords, QR codes or converted values, review the result before sharing it. A browser tool can help with speed and consistency, but responsibility for applying the output safely remains with the user.