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About this tool
See what interest-based ad topics are, how each platform builds them, and get a per-platform reset checklist.
Ad Topic Profile Explainer describes what an interest-based ad topic is — a label a platform infers about you so advertisers can buy an audience without buying your identity — and builds a per-platform reset checklist across ten browsers, accounts and devices. For each one it gives the settings area to open, the steps in order, how long the reset lasts, and the catch that most people miss. It also totals the time the routine costs at whatever interval you choose, because the profile rebuilds itself from ongoing activity.
Open Ad Topic Profile Explainer on AltFTool — it loads instantly in your browser.
Upload or drag in the file you want to work with.
Adjust the settings and preview the result.
Download the finished file to your device.
Ad topics live in three separate places, and clearing one leaves the other two untouched.
Every entry says what the setting does not cover, such as past activity that stays in place after opting out.
Shows the minutes per round and hours per year, so you can pick an interval you will actually keep to.
They are interest labels a platform infers and attaches to your profile — 'home improvement', 'travel', 'fitness' — so advertisers can target a group rather than a person. They come from what you do on the platform, what other companies' sites and apps report back through pixels and SDKs, customer lists advertisers upload and match to your email or phone number, approximate location from your IP address, and similarity to existing audiences.
No. It changes how ads are selected, not how much data is collected, and you will see the same number of ads — chosen instead by coarse signals such as approximate location, the subject of the page and the time of day. To reduce the collection itself you also have to turn off the activity settings that feed it, and delete the history already stored.
Open Chrome settings, then Privacy and security, then Ad privacy, then Ad topics. You can block individual topics or switch the feature off entirely. Chrome recalculates topics on a weekly cycle and keeps only the most recent few weeks, so the list turns over by itself — but the setting is per browser profile, so you have to repeat it on every profile and device.
Major platforms restrict targeting on sensitive categories including health, religion, sexual orientation, race and political affiliation, and several removed detailed sensitive interest options outright. Those restrictions govern what advertisers can buy, not what the platform may infer internally, and enforcement has been imperfect — if you see a sensitive-looking topic in your own list, treat it as a reason to switch personalisation off rather than to rely on the restriction.