Gmail and Outlook do not track whether someone opened an email attachment. Read receipts only confirm the email was opened, not the file. The only reliable method is to share documents as tracked links rather than attachments; platforms like Pitchwise log every open, page view, and forward in real time.
You sent a proposal, a contract, or a deck as an email attachment. A day passes. Then two. No reply. The question that keeps surfacing: did they even open it?
It is a reasonable thing to want to know. If they opened it and chose not to respond, that is one situation. If it landed in spam, or the attachment failed to load, or they just have not gotten to it yet, that is completely different. The right next move depends on the answer. Here is the honest picture of what you can and cannot see.
Can Gmail or Outlook tell you if an attachment was opened?
No. Neither Gmail nor Outlook tracks whether someone opened an attachment. Both platforms have some form of tracking functionality, but those features only apply to the email itself, not to any file attached to it.
A read receipt in Gmail, available via Google Workspace accounts, tells you when the recipient opened the email. It says nothing about whether they clicked the attached file. Outlook's read receipt works the same way. This trips up a lot of people who assume "email opened" and "attachment opened" are the same event. They are not.
The same principle applies if you send a PDF via email or share a document any other way without a tracking layer.
What do read receipts actually track?
A read receipt registers the email as open, not the attachment as open. And even at that level, they are unreliable. Most email clients let recipients decline them silently; the sender never finds out the request was declined. What looks like a non-open may simply be a declined receipt.
Apple Mail makes this worse. Since iOS 15 and macOS Monterey, Apple Mail prefetches email images by default, which can trigger a read receipt without the person ever actually reading the message. A significant share of email "opens" are proxy prefetches, not human reads. So even email-level tracking has a reliability problem.
For similar reasons, tracking if someone opened a Google Drive link also has limitations without a dedicated sharing platform.
Why email attachments are a tracking dead end
When you attach a file to an email and send it, the file is copied to the recipient's device. It becomes a local file, completely disconnected from you. No signal can travel back from a PDF sitting in someone's Downloads folder to tell you it was opened.
This is different from a link. A link still points somewhere. A file attachment is just a copy. Once it leaves your outbox, you have no connection to it.
If you want to know whether a client read your proposal, the attachment approach will never answer that question. Neither will any setting inside Gmail or Outlook.
What works instead: tracked links
The approach that gives you real data is replacing the attachment with a tracked link. Instead of attaching a file, you upload the document to a platform that generates a shareable link. When the recipient opens that link, the platform records the event and notifies you in real time.
This is meaningfully different from an attachment open. A tracked link tells you not just that someone clicked but also whether they read past page one, where they slowed down, and whether the document was forwarded to someone else.
For proposals, pitch decks, and contracts, that information changes how you follow up. If they spent eight minutes on the pricing section, you know what to address. If they opened it and closed in ten seconds, you know the problem is attention, not content. The best tools for sending and tracking sales proposals cover how different tools compare on this.
What you can see with the right tool
Pitchwise generates a trackable link for any document you upload. You share the link the same way you would share anything else over email, and you can see opens, time spent per page, and forwards in real time.
The recipient does not need an account to view it. From their side, it looks like a normal link. From your side, you have a complete picture of exactly what they did with the document.
If you have been sending attachments and wondering whether they are being read, switching to tracked links is the only change that actually answers the question.
Frequently Asked Questions
Can you track if someone opened a PDF you emailed?
Not through Gmail or Outlook directly. Once a PDF is attached to an email and sent, it becomes a local file on the recipient's device with no connection back to you. The only way to track opens is to share the PDF as a tracked link rather than a direct attachment.
Do email read receipts show if an attachment was opened?
No. Read receipts only confirm the email itself was opened, not any attachments. They are also unreliable; most email clients allow recipients to decline them silently, and Apple Mail can trigger false opens through image pre-fetching.
Is there a way to track email attachments for free?
Most free email clients have no attachment tracking at all. Some document sharing platforms offer free tiers where you share files as tracked links, giving you open data, page-level engagement, and forward notifications without a paid subscription.
What is the difference between tracking an email open and tracking an attachment open?
Email open tracking uses a pixel in the email body that fires when the email loads. Attachment tracking requires the file to be hosted on a server; a link back to that server is what enables tracking. Local file attachments have no such connection, which is why tracked links work and email attachments do not.
