LCDOK is a single-file, install-free monitor test tool. 10 categories and 32 test screens covering dead pixels, grayscale, geometry, focus, color and audio — copy it to a USB stick and give any screen a full check-up, anywhere.
Single file · No registry · No network · 13 languages
Single file · No registry · No network · 13 languages
One EXE does it all. 32-bit and 64-bit builds; a USB stick turns it into a portable test bench.
Dead pixels, grayscale, geometry, convergence, focus, moiré, readability, resolution, color and audio — all in one run.
Follows the system language by default, falls back to English, switches instantly.
1px-level screens plus a direct shortcut to Display Settings — no scaling artifacts, no false verdicts.
See all 32 test screens
Next screenLeft click, Space or → also work
Previous screenStep back any time
Exit testRight click also works, back to the menu
Left click = page turnAlso effective in auto mode
32-bit build, runs on any Windows 7+ system, 32 or 64 bit.
Download LCDOK.exeUsually caused by non-100% scaling or a non-native resolution. Set the panel's physical resolution and 100% scaling in Display Settings before judging convergence, focus or resolution screens.
No. Moiré is a normal interference phenomenon of digital panels — the fainter the better, and some displays can reduce it via driver settings.
Never. It only uses standard Windows libraries (GDI / winmm) and contains no network code — safe for offline use.