Free tool
Most sales emails, newsletters and a surprising share of ordinary one-to-one emails carry an invisible tracking pixel that reports when you open them. Paste an email's source below and see exactly who is watching. Runs entirely in your browser: nothing is uploaded, ever.
Everything stays in your browser. Nothing you paste is uploaded, stored or sent anywhere.
Open the email, click the three dots in the top-right of the message, choose Show original, then copy everything on the page that opens.
Open the email, click the three dots in the message toolbar, then View → View message source and copy the contents.
Open the email, click the three dots in the toolbar, choose View raw message and copy the contents.
Two things. First, known tracker signatures: the pixel and redirect domains used by more than 25 tools, including Mailtrack, Mailsuite, Yesware, HubSpot Sales, Streak, Mixmax, Outreach, Salesloft, Mailchimp and SendGrid. Second, generic invisible pixels: any remote image sized 1×1 or hidden with CSS, which is the anatomy of every open tracker regardless of brand.
Full transparency: Vidi is itself an email read-receipt tool, and this checker detects Vidi-tracked emails too. We built the detector because we think tracking done honestly survives scrutiny, and tracking done sneakily deserves to be caught.
Because the silence after sending an email is unbearable, and a pixel ends it. Salespeople want to know a proposal was read. Freelancers want to know the quote landed. Job seekers want to know the application was opened. That is a legitimate need served by an often invisible mechanism, and it is exactly why we built Vidi to do it without pretending: nothing visible added to the email, machine opens labelled honestly instead of faked, and a plain answer to the only question that matters: did they read it? If you are curious how that looks from the sender’s side, see how to know if someone read your email or read about why Apple Mail makes most trackers lie. Waiting on a reply to something you sent instead? Try the follow-up timing calculator for a plain answer on whether it is too soon to check in.
Open the email’s original source (in Gmail: three dots, then "Show original") and look for tiny invisible images — 1x1 pixel tags loaded from a remote server. Each tracker uses recognisable domains, like mailtrack.io or t.yesware.com. Vidi’s free email tracking checker scans pasted source for 25+ known tracker signatures and generic invisible pixels automatically.
Yes. The check runs entirely in your browser with client-side JavaScript. The email source you paste is never uploaded, stored or sent to any server, including ours.
A tracking pixel is a tiny, invisible image embedded in an email. When you open the email, your mail client loads that image from the sender’s server, which tells them the message was opened, when, how many times, and roughly where from. Nearly every email tracker, newsletter platform and sales tool works this way.
Mostly. Disable automatic image loading in your mail settings, or use a client that proxies images (Gmail) or pre-fetches them (Apple Mail Privacy Protection). Blocking or proxying images prevents or muddies open tracking, though link clicks can still be tracked separately.
Vidi shows WhatsApp-style ticks in Gmail, Outlook.com and Yahoo Mail. $1.99/month launch pricing, 30-day money-back guarantee.
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