What “processed locally” means for your browser tools
A tool can do its work on your computer and still need permission to read a page. It can also create files you will need to look after. Local processing is useful, but the practical details matter more than a short privacy slogan.
Start with the input
TextLens reads images you choose inside the extension or a visible screen region you select. Its recognition worker and language data are bundled with the extension. The website playground reads built-in samples only. There is no image-upload control in the showcase, and the preview server rejects data submissions.
Know where the output goes
TextLens keeps recognized text in a local history. WebVault keeps page captures in a local archive and can export them as HTML or ZIP. TableSnap generates CSV, Excel and JSON files locally. Once you export a file, it is a separate copy: deleting an archive entry does not delete the file from your Downloads folder.
Treat website access as a separate question
A one-time page action can use access granted by the browser toolbar click. An automatic cookie helper needs continuing access to find banners during browsing. A remembered PopupDestroyer selector needs access to the website where you saved it. These permissions describe what the extension may read or change. They do not, by themselves, say that data is being uploaded.
Check optional connections
CookieKiller offers optional browser sync for its on/off preference. That service belongs to the browser vendor; site rules and recent activity stay local. Aegis can contact filter providers you choose for custom subscriptions. WebVault reads resources from a page’s servers while making a capture. Those connections have different purposes from sending your screenshots to a studio server.
Finish with a little housekeeping
Clear OCR history when you no longer need the text. Remove archived pages you have exported and checked. Review remembered website selectors when a layout changes. Protect your browser profile and device account, and keep important exported files somewhere you can back up. Local storage is still storage.
