Loading page
About this tool
Copy a temporary secret with a local expiry timer and make a best-effort clipboard clear only if the same value is still present.
Clipboard Secret Expiry Guard copies a temporary value — an OTP, a recovery code, a one-off password — and starts a countdown of between 10 seconds and one hour, after which it reads the clipboard back and blanks it only if the exact same value is still there. That last check is the point: if you have copied something else in the meantime, your newer clipboard item is left alone. Before you copy, it also scans the text locally for six kinds of sensitive pattern, including API keys, labelled passwords, OTP codes, email addresses, phone-like numbers and card-like digit runs.
Open Clipboard Secret Expiry Guard on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
At expiry it compares the live clipboard against the exact string it wrote and overwrites only on an exact match, so a value you copied since is never destroyed.
If the browser denies clipboard read or write permission, it says the system clipboard was not verified rather than claiming a clear that did not happen.
The pre-copy scan recognises sk-/gh_/AKIA/xox- style keys, 'password:' or 'token=' labels, OTP phrasing with a 4-8 digit code, emails, phone-shaped numbers and 13-19 digit card-like runs.
Between 10 seconds and 3600 seconds (one hour), defaulting to 60 seconds. Anything you type outside that range is clamped to the nearest limit, and the countdown displays as mm:ss.
Your newer clipboard content is left untouched. At expiry the tool reads the clipboard and, finding a value that does not match what it wrote, reports that a newer item was detected and clears only its own in-tab copy.
No. The timer runs in the page, so the tab must stay open for the clear to be attempted. This is a best-effort convenience, not a guarantee — treat it as a reminder mechanism rather than a security control.
No. Pattern matching runs in the page on up to 100,000 characters of your input, and nothing is uploaded. For anything genuinely long-lived, such as a real account password, use a password manager rather than the clipboard.