Jul 10, 2025 · 5 min read
Gmail Privacy Extension: 5 Tools Compared for 2026
We tested the five most installed Gmail privacy extensions, Gblock, Ugly Email, PixelBlock, Trocker, and Email Privacy Protector, plus the "switch providers" options Proton and HEY, to see which ones actually stop tracking rather than just detect it.
Picking the right Gmail privacy extension is harder than it should be, because most of the options on the Chrome Web Store solve only half the problem. A tool that only flags spy pixels after the fact does not stop the tracker from firing, and none of the pixel blockers protect you the moment you click a tracked link inside an email. We installed the leading Gmail privacy extensions side by side, Gblock, Ugly Email, PixelBlock, Trocker, and Email Privacy Protector, and compared them against Proton and HEY, two email providers that solve tracking by replacing Gmail entirely rather than sitting on top of it.
Key Takeaways
- Most Gmail privacy extensions rely on a static blocklist of known tracking domains, which misses new tracking services until someone manually adds them.
- Ugly Email and Email Privacy Protector detect spy pixels but offer no protection against click tracking, the tracking that fires when you click a link rather than open an email.
- Trocker blocks more aggressively than most alternatives, but that can break legitimate images and email layouts along with the trackers it catches.
- Gblock is the only extension in this comparison that pairs automatic spy pixel detection with click tracking protection and a built in proxy that anonymizes link clicks.
- Proton and HEY remove Gmail from the equation entirely, which stops tracking completely but requires migrating your inbox rather than installing an extension.
What Should a Gmail Privacy Extension Actually Block?
A Gmail privacy extension worth installing needs to cover two separate attack surfaces, not just one. The first is the spy pixel, a 1x1 transparent image embedded in an email that silently reports back the moment you open the message, along with your approximate location, device, and read time. The second, and more commonly ignored, is click tracking: the redirect links inside marketing and sales emails that route through a tracking server before landing on the real destination, logging your IP address and exact click time along the way. A tool that only handles spy pixels leaves the second half of the problem completely open. Most "tracker blockers" also lean on a static list of known tracking domains, which stops yesterday's trackers but leaves you exposed the moment a new email marketing platform launches a tracking pixel under a domain that has not been added to the list yet.
How Do the Top Gmail Privacy Extensions Compare?
| Feature | Gblock | Ugly Email | PixelBlock | Trocker | Email Privacy Protector |
|---|---|---|---|---|---|
| Spy pixel protection | ✓ | ✓ | ✓ | ✓ | ✓ |
| Automatic detection of new spy pixels | ✓ | ✗ | ✗ | Limited | ✗ |
| Click tracking protection | ✓ | ✗ | ✗ | Limited | ✗ |
| Built in proxy to anonymize clicks | ✓ | ✗ | ✗ | ✗ | ✗ |
| Custom allow/block rules | ✓ | ✗ | ✗ | ✗ | ✗ |
Where Do Ugly Email, PixelBlock, and Trocker Fall Short?
Ugly Email scans your inbox and marks known trackers with a small eye icon, which is useful for awareness but does not actually stop the pixel from loading or protect you once you click a link. PixelBlock takes a similar detection first approach, relying on a maintained list of known tracking services that, like any static list, lags behind new trackers by definition. Trocker blocks more aggressively than either of those two, but that aggression is a double edged sword: it can strip out legitimate embedded images along with real spy pixels, which sometimes breaks the layout of newsletters and receipts you actually want to see intact. None of the three offer click tracking protection or a built in proxy, so the moment you click a link in a marketing email, your IP address and click time are exposed regardless of which one you have installed. A fuller breakdown of how Ugly Email, PixelBlock, and Trocker compare on pixel detection alone covers the detection differences in more depth.
Proton and HEY take a different approach entirely: instead of adding a privacy layer on top of Gmail, they replace it. Proton Mail blocks remote content and tracking pixels by default at the mail server level, and HEY's "Screener" and image proxying strip tracking data before a message ever reaches your inbox. Both are strong options if you are willing to migrate away from Gmail, but that is a meaningfully bigger step than installing an extension, and neither helps if your employer, clients, or contacts require you to stay on Gmail.
Three Ways Gblock Closes the Gaps
Automated Spy Pixel Detection
Every time Gblock detects a previously unseen spy pixel, it flags and submits it to our spy tracker detection API. The global blocklist updates automatically within seconds, no manual list updates, no waiting on the next extension release, which is exactly the gap that leaves static blocklist tools like PixelBlock and Email Privacy Protector permanently a step behind new trackers.
Smart Click Tracking Protection
Gblock strips known tracking parameters, like ?utm_source=newsletter, and routes shortened or obscured links through our proxy, masking your IP and anonymizing your click activity. The proxy never stores personal data and can be disabled in your account settings. This is the exact protection Ugly Email, PixelBlock, and Trocker do not offer.
Per Account Custom Rules
Need to allowlist a known URL or block a niche email service provider? Create custom rules using simple strings or full Regex, the same syntax Chrome's declarativeNetRequest uses. Your personal rules always override the defaults, giving you complete control over Gblock's behavior in a way none of the other extensions in this comparison expose.
Which Gmail Privacy Extension Should You Install?
If all you want is a heads up that an email contains a spy pixel, Ugly Email or PixelBlock will tell you that much for free. If you want an extension that actually blocks both spy pixels and click tracking without requiring you to leave Gmail, Gblock is the only tool in this comparison that covers both, and it does so with a blocklist that updates itself rather than one you have to wait on. And if you are open to switching providers entirely, Proton or HEY solve the problem at the source, at the cost of a full inbox migration. There is no wrong answer here as long as you understand which half of the tracking problem the tool you pick actually covers.
Comparison based on hands on testing of each extension's published feature set and behavior as of July 2026. Extension capabilities change over time; verify current features on each provider's own listing before choosing.