A Privacy and Security Toolkit for Safer Signups
Build a practical browser-only workflow with temporary email, generated passwords, URL cleaning, header review, and tracking-pixel checks.
Browser-only utility
Tracking Pixel Checker, private by default
Inspect email HTML before trusting it. This checker finds tiny remote images, hidden image styles, suspicious image dimensions, and common marketing links without uploading the content.
Check email HTML for tracking pixels
Scan summary
Waiting for email HTML.
Images
0
Likely pixels
0
Marketing links
0
Privacy clues
- Paste email HTML to scan for remote images and tracking clues.
Remote image domains
No remote image domains found.
Link domains
No link domains found.
Likely pixel findings
No likely pixels found yet.
This checker parses HTML locally and does not load remote images or upload pasted content.
How to use pixel checker safely
How email tracking pixels work
A tracking pixel is usually a tiny remote image inside an email. When your email client loads that image, the sender's server may learn that the message was opened, when it was opened, and technical details such as IP address or device hints.
Pixels often look like normal image tags in HTML. Some are 1x1 pixels, transparent GIFs, or hidden with CSS so they do not appear in the visible message.
What this checker looks for
The checker scans pasted HTML for image tags, image dimensions, hidden styles, remote image URLs, and common marketing-link patterns. It also summarizes remote domains so you can see which external hosts the email references.
It does not load those images. It only parses the HTML text you paste into the box.
- Tiny images such as 1x1 or 0x0 dimensions
- Display-none, visibility-hidden, opacity-zero, or off-screen image styles
- Remote image URLs that can call a sender-controlled server
- Marketing links with UTM tags or click-tracking-style URLs
Limits and safe habits
Not every remote image is a tracker. Logos, product images, and newsletters often use remote images for normal design. Treat the result as a privacy clue, not a verdict.
For sensitive mail, disable remote image loading in your email client, use a privacy-focused inbox workflow, and avoid clicking links in messages you did not expect.
Why people use this tool
Email HTML is scanned locally in your browser. tempboxs does not receive the pasted HTML, links, or image URLs.
Find likely pixels
Detect 1x1 images, hidden image styles, transparent GIFs, and remote image URLs that commonly act as open trackers.
Review remote domains
List image and link domains so marketing platforms and unexpected hosts are easier to notice.
Keep message data local
Analyze copied HTML in the browser without sending message content to a server.
Guides from the blog
Learn more about privacy, tracking, passwords, and safer signups.
Email Tracking Pixels Explained: What Loads When You Open a Message
Learn how tracking pixels, remote images, and marketing links can reveal email opens, plus how to reduce tracking in your inbox.
The Ultimate Guide to Email Tracking Pixels: How They Watch You and How to Block Them
Discover how invisible 1x1 tracking pixels inside your emails monitor your opens, location, IP address, and device—and learn how to easily block them.
How to Clean Tracking Links Before You Share Them
Learn what UTM tags, click IDs, and redirect wrappers reveal, plus how to remove tracking parameters without breaking useful links.
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FAQ
No. It parses the pasted HTML text and does not request the image URLs it finds.
No. The scan runs locally in your browser and does not send pasted HTML to tempboxs.
No. Some remote images are normal design assets. Tiny, hidden, unique, or analytics-style image URLs are stronger tracking clues.
Disable automatic remote image loading in your email client and only load images from senders you trust.