Record a screen, window, or browser tab locally with supported desktop browsers, then download the result as a WebM file.
Capture your screen directly in the browser using the Screen Capture API. Download recordings as WebM video files.
Modern browsers support screen capture through the Screen Capture API, which provides the getDisplayMedia() method. This allows web applications to request permission to record the user's screen, a specific application window, or a browser tab — all without requiring any software installation.
The MediaRecorder API compresses the captured stream in real time using VP9 video encoding and Opus audio encoding, producing WebM files that are smaller and of comparable quality to H.264 MP4 for typical screen content. All processing is local — no data leaves your browser.
Click the Start Recording button. Your browser will show a permission dialog to choose what to share.
Select your entire screen, a specific window, or a single browser tab. Optionally include audio.
Click Stop Recording or use the browser's "Stop sharing" button. Then click Download WebM to save the file.
Continue with another check for the same device or signal.
Measure your click speed with 10s/30s/60s timers. Track CPS/CPM, left/right clicks, and share results.
Measure your reflex speed in milliseconds with a 5-round click test. Compare to gamer and average population benchmarks.
Click targets to train mouse accuracy and measure targets per second. Three difficulty levels: large, medium, and small targets.
Precision click test — click stationary targets and measure your accuracy percentage and click speed across difficulty levels.
Measure your typing speed in words per minute (WPM) and accuracy. Choose 30s or 60s mode with color-coded word feedback.
Learn about screen recording, video capture, and browser media APIs.
If an online keyboard tester does not detect one key, several keys, or modifier combinations, start with focus, layout, browser shortcuts, rollover limits, and hardware checks.
A browser GPU stress test can reveal crashes, throttling, noisy fans, and WebGL issues, but it cannot replace tools that read sensors, VRAM errors, or driver-level stability.
If a refresh rate test reports 60Hz on a 144Hz or 240Hz monitor, check OS settings, cable limits, browser throttling, VRR, duplicated displays, and power mode.
Mouse polling rate tests can jump between values because of movement speed, DPI, browser event delivery, wireless mode, CPU load, and USB power settings.
If a browser gamepad tester does not detect an Xbox, PlayStation, Switch, or generic controller, check connection mode, browser support, focus, permissions, and Steam input.
If an online microphone test cannot hear you, check browser permissions, the selected input device, OS privacy settings, exclusive mode, Bluetooth headset profiles, and HTTPS.