Frequently asked questions

Legacy Tools is a collection of small tools made by k-wada@Legacy Tools to help with everyday tasks and work.

The tools currently available are free to use. If anything changes, we will note it on each tool’s page.

Japanese, English, and Simplified Chinese. The language is auto-selected from your browser and can also be switched manually from the header on each page.

Supported environments vary by tool. Each tool’s page lists its requirements (for example, Safe Privacy Gate is an extension for Google Chrome).

Checks and replacements run on your device. The extensions do not send your input or files to the developer's servers. What they store, and where, varies by tool.

None of it reaches the developer. There is no sign-up and no login, and nothing you type is sent anywhere. What is kept on your device differs by tool: most keep only settings, but Find My Age stores the birth dates of the people you register, and Copy & Prep stores the passages you collect — both on your own device. Safe Night Check’s settings are the one exception: they go to Chrome’s synced storage, so with Chrome sync on they can appear on your other devices signed in to the same Google account.

All of the tools work inside the page, so this item appears on their Chrome Web Store listings (the scope differs per product). It is needed to run pre-send checks, show confirmation dialogs, and display results on the page — what a tool reads is never transmitted outside. What is stored, and where, differs by tool.

No. All checks run inside your browser and nothing is sent externally.

No. It is only read momentarily for the check and is never stored.

No. It is a helper that prompts awareness — the final decision is yours.

It is a lightweight personal check tool. It does not perform organizational monitoring or enforcement.

No. It does not block sending. It replaces matching text in the selected input fields on your device before you send. Only your own action sends the message.

No. Detection and masking all run inside your browser and nothing is sent externally.

Major AI chats are covered automatically. On other sites, register the fields you want replaced and it will run there.

No. There is no limit on the number of rules. Large numbers of rules or complex regular expressions may slow down processing.

No. It only reads and displays — your file stays byte-for-byte identical. There is no feature that removes or strips metadata.

No. All reading finishes on your device, with zero network communication. A CSP forbids network connections, and a build-time check confirms there is no networking code.

No. It never stops or interrupts your send. It only shows a review card; your upload continues as usual.

No. The only inputs for the check are the time of day and your settings — it never reads your message.

No. It only adds a single confirmation. Choose “Send anyway” and your email goes out as is.

It currently supports Gmail (mail.google.com) only, and acts only during the night hours you set (default 22:00–06:00). During the day it does nothing.

No. It reads only the URL and visible text of the link you click, and discards them as soon as it has derived the destination.

No. It shows the real destination and format-level cautions, and never declares a link “dangerous” or “safe.” Whether to open it is always your decision.

No. Choose “Allow this time”, then click the link again to open it. Choosing Allow does not open the link automatically.

Gmail, Outlook on the web, and Yahoo! Mail (Japan). You can also add any webmail domain under “Sites to check” in the settings.

No. It reads only the range of text you selected — never the page’s body, headings, or URL. Even that selection is discarded as soon as it has decided whether the text is a date.

Only inside your browser (chrome.storage.local). They are kept out of synced storage, so they never travel to your other devices.

No. It shows the ordinary age, the Japanese era year, the weekday, and the distance from today — nothing else. It never annotates every date on a page automatically, either.

No. Dates before 1868 (Meiji 1) are not read. Japan used a lunisolar calendar before then, so mapping a Gregorian date onto a Japanese era year would print a day that never existed.

No. It handles only the text you explicitly added from the right-click menu. It has no standing content script and requests no host permissions. Only when you add text does it read the text selected where you right-clicked; it does not scan the page.

Only whitespace and line breaks. It removes awkward line breaks and trailing spaces and rejoins wrapped lines inside a paragraph. It does not summarize, rephrase, or proofread, and nothing changes until you press apply.

No. They are kept alongside each item but are not part of the output by default. Turn the page name, URL, and date added on individually when you want them.

No. It is stored in chrome.storage.local only; chrome.storage.sync is not used. You can delete a single item or clear everything at any time, from the popup or the settings tab.

No. It does not access input values, files, selected text or the clipboard. Automated build checks verify that the code handling input fields does not access them.

No. It makes no safety judgement. It tells you what the page states and what it does not. It does not prove that a company exists, and it does not verify that the statements are correct. Finding nothing does not mean a site is safe.

No. It reads only the page you have open. Something is shown as “Other page” solely because you yourself visited that site’s legal notice, terms, privacy policy or company page earlier in this session.

No. It appears only when you press the toolbar icon. It does not listen for clicks, Tab presses or focus changes on the page. You can run it as often as you like; opening and closing it are not recorded.

You can reach us through the email form on the Support page.

Legacy Tools is run by one person. Requests are handled in order, as time allows, so some replies may take a while.

Each tool’s page documents its features and specs in detail. Open “Tools” in the header to browse them.