Screen Test · free online device tool
Dead pixel tests and touch tracing. No install, opens instantly, works offline — data stays in your browser.
How to use Screen Test
- Open this page (or search “Screen Test” on www.258tool.com).
- Enter your input in the tool panel — results update instantly.
- Copy, download or save as needed; your data is stored locally on this device.
FAQ
Is Screen Test free?
Completely free. No sign-up, no account — open and use.
Is my data uploaded to a server?
No. All processing runs locally in your browser; data stays on your device.
Does Screen Test work offline?
Yes. After the first visit, add 258tool to your home screen and everything works offline.