DOTFIXER
Fix it yourself — PC repair and maintenance, driver and malware fixes, diagnostics and optimization, and the tools every troubleshooter needs.
From converting storage units and estimating a download to sizing a power supply, planning an IP subnet, working out screen resolution, and checking a password, DotFixer pairs free hands-on PC repair calculators with practical guides and a richly illustrated museum. Fix it yourself, run faster.
PC Repair & Tech Tools & Calculators
Free tools for fixing and maintaining a PC — data storage unit converter, download time calculator, PC power supply wattage calculator, IP subnet calculator, screen resolution & PPI calculator, and a password strength checker.
Data Storage Unit Converter
Convert between bits, bytes, KB, MB, GB, TB, and PB in both decimal (SI, 1 KB = 1000 B) and binary (IEC, 1 KiB = 1024 B) systems — and see exactly why a 1 TB drive shows as about 931 GB in Windows
Download Time Calculator
Estimate how long a download takes from the file size and your connection speed, with the megabit-versus-megabyte gotcha handled (100 Mbps ≈ 12.5 MB/s) and a real-world overhead allowance
PC Power Supply (PSU) Wattage Calculator
Add up the draw of your CPU, GPU, RAM, drives, and fans to get an estimated load, then a recommended power-supply wattage with ~30% headroom rounded to a common size for efficiency and upgrades
IP Subnet Calculator
From an IPv4 address plus a CIDR prefix or subnet mask, compute the network and broadcast addresses, netmask, wildcard mask, usable host range, and host counts — the everyday maths of network troubleshooting
Screen Resolution & PPI Calculator
Enter a resolution and diagonal size to get pixel density (PPI), aspect ratio, total megapixels, and the matching display standard (1080p, 1440p, 4K) — compare monitors and laptops at a glance
Password Strength Checker
Estimate a password's entropy in bits and offline crack time from its length and character variety, with a strength rating and tips — runs entirely in your browser and never sends or stores your password
Museum of Computing & the PC
Wander an immersive museum of the machines and ideas that built the personal computer — the classic machines from ENIAC to the graphical desktop alongside the parts inside every PC, the pioneers and foundations of computing, and the hardware that connects the world, each in its own gallery, so you can get to know the stories behind every one: how it came to be, what makes it matter, and the role it plays in the machine on your desk.
Tour the museum →From the Journal
Fresh guides on hardware diagnostics, driver updates, malware and virus removal, data recovery, and system optimization, plus practical tips on maintenance, networking, and getting the most out of every machine.
The Art of Precision: Mastering Effective Bug Fixing Techniques
The Art of Precision: Mastering Effective Bug Fixing Techniques Bug fixing is not merely an act of correcting errors—it’s a meticulous process that demands precision, patience, and analytical thinking. In…
The Art of System Optimization: Mastering Performance Tuning for Modern Computing Environments
The Art of System Optimization: Mastering Performance Tuning for Modern Computing Environments In today’s fast-paced digital landscape, system optimization has become an essential skill for professionals across industries. Whether you’re…
The Art of Software Fixes: Mastering Troubleshooting and Maintenance for Modern Applications
The Art of Software Fixes: Mastering Troubleshooting and Maintenance for Modern Applications In today’s fast-paced digital landscape, software fixes are not merely an afterthought but a critical component of application…
Fundamentals of Effective Tech Troubleshooting
The Ultimate Handbook to Mastering Tech Troubleshooting: Strategies, Tools, and Pro Tips from DotFixers Worldwide In an era where technology permeates every aspect of our lives, encountering tech issues has…
Registry Cleaning Strategies and Implementation
The Definitive Roadmap to Mastering Windows Registry Optimization: A Deep Dive into Enhancing System Performance In an era where digital efficiency is paramount, understanding the nuances of your operating system’s…
Understanding System Recovery Fundamentals
The Ultimate Roadmap to Mastering System Recovery: A Deep Dive for Tech Enthusiasts and Professionals In an era where digital reliability is paramount, system recovery stands as a critical lifeline…
Keep Learning
Practical know-how on diagnosing, repairing, and maintaining a PC, plain-language explainers on storage, bandwidth, power supplies, and networking, and seasoned tips for first-timers and experienced technicians alike — everything you need to dig deeper and fix further.
Visit the Learn hub →