Free Online Computer Stress Test

Push your CPU and graphics card under load right in your browser — no download, no install. A fast way to flush out heat-related crashes and instability.

Handy after a repair, a fresh build, or before you trust a machine with something important. Runs on any computer; we repair Windows PCs.

No install · runs in your browser Start the Stress Test →

Computer Stress Test

Push your CPU and graphics card hard for a set amount of time to flush out heat-related crashes, instability, and weak hardware — right from your browser, nothing to install. Great for a quick sanity check after a repair, a new build, or before you trust a machine with something important.

What this does — and what it can't

This generates real load and heat on your CPU and GPU. But a web browser cannot read your temperatures, fan speeds, or exact CPU/GPU usage. To judge whether your PC is healthy, run a free monitor like HWiNFO or HWMonitor alongside this, watch your temps, and listen to your fans. If the machine crashes, freezes, shows visual glitches, or shuts itself off during the test — that's a real warning sign worth getting looked at.

Looks like a phone or tablet. This tool is built for testing desktop & laptop PCs. You can run a light test, but it will drain the battery and get warm — we've dialed the defaults down for you.

1. What do you want to stress?

CPU load — 0 workers at 100% target

More workers = more cores hit. One per logical core pins the whole CPU. Drop the % to run a gentler soak.

GPU load

Higher = more pixels and heavier math per frame. Watch the FPS once it's running — a strong GPU holds a high frame rate at Extreme.

2. How long?

I understand this heats up my computer, I have decent airflow, and I'll keep an eye on it. (Required for long or unlimited runs.)

-- FPS

Elapsed

0:00

Remaining

—

CPU workers

FPS (min)

—

Screen wake lock: checking…

While it's running

Make sure the PC has airflow — laptops on a hard, flat surface (never a bed or couch).
Stop immediately if you see artifacts/glitches, smell anything hot, or it shuts off on its own.
Keep this tab in the foreground — minimized/background tabs get throttled by the browser.

Did it crash, overheat, or act up?

That's exactly the kind of thing we chase down on the bench — with real monitoring gear and a proper stress suite, not just a browser. Bring your Windows PC in for a diagnostic.

Diagnostic Fee: $39.99 standard PCs · $99 gaming PCs (separate from any repair)
Location: 2069 Carlisle Road, York, PA 17408
Phone: 717-739-9675
Hours: Monday–Friday 9 AM–5 PM · Closed Saturday & Sunday

This free tool is a quick screen, not a professional diagnosis, and it only does what a browser is allowed to do. We're a Windows-only repair shop — the test itself runs on any computer, but we only service Windows PCs and laptops. Run it at your own risk; York Computer Repair isn't responsible for damage caused by misuse or by running it on hardware that's already failing.

What is a computer stress test (burn-in)?

A stress test, sometimes called a burn-in, deliberately pushes your computer's processor (CPU) and graphics card (GPU) to work as hard as they can for a stretch of time. The idea is simple: a lot of computer problems only show up when the machine gets hot and busy. A PC that seems perfectly fine browsing the web can crash, freeze, or shut itself off the moment it's put under real load. Running a heavy load on purpose — in a controlled way, while you watch it — surfaces those weak spots quickly.

Our free tool above does this right inside your browser. There's nothing to download or install, and it works on any computer. Pick whether you want to load the CPU, the GPU, or both, choose how long to run, and press start. The spinning 3D animation is the GPU test working; behind the scenes, the CPU test runs heavy math on every processor core at once.

What this tool can and can't tell you

Being straight with you: a web browser is sandboxed for your security, which means it cannot read your computer's temperatures, fan speeds, or exact CPU and GPU usage. This tool genuinely creates load and heat — but it can't show you a temperature number. To get the full picture, run a free monitoring program like HWiNFO or HWMonitor next to it and keep an eye on your temps while the test runs. Use your ears too: fans spinning up loudly under load is normal and healthy; a fan that never spins up, or one that grinds and rattles, is not.

The clearest signals this tool gives you on its own are the dramatic ones. If your computer crashes, freezes, restarts, blue-screens, shows colorful glitches or artifacts, or powers off partway through a test, that's a real red flag — usually overheating, a failing part, a weak power supply, or an unstable graphics driver. A healthy machine should be able to hold a full load for the duration you pick without drama.

A quick screen, not a full diagnosis

This is a fast, free sanity check — it is not a substitute for professional, dedicated stress-testing software or a proper bench diagnosis. Programs like Prime95, OCCT, and FurMark push hardware harder and in more targeted ways than a browser is allowed to, and a real diagnosis pairs that with live temperature and power monitoring. If your computer acts up during this test — or if you just want certainty after a repair or a new build — bring your Windows PC to York Computer Repair at 2069 Carlisle Road, York, PA 17408. We run a proper bench burn-in with monitoring gear and tell you exactly what's going on before any paid work begins.

Walk-in drop-off Monday through Friday, 9 AM to 5 PM (closed Saturday and Sunday). The diagnostic is $39.99 for standard PCs and $99 for gaming PCs, separate from any repair cost. Questions first? Call us at 717-739-9675.

Tips for a useful test

Keep this tab in front. Browsers slow down tabs running in the background, which lightens the load. Leave the test tab visible.
Give it airflow. Desktops need clear vents; laptops belong on a hard, flat surface — never a bed, blanket, or couch cushion.
Watch and listen. Run HWiNFO or HWMonitor alongside, and stop the test the moment anything looks or smells wrong.
Longer is harder. A few minutes catches obvious failures; a longer soak (or "run until I stop") is better for chasing intermittent, heat-soak crashes.