Gmail's built-in encryption works only with other Gmail users
Gmail has a feature called confidential mode that encrypts messages so only the person you send them to can read them. It is not the same as full email encryption — it works only when both sender and recipient use Gmail, and Google still stores the encrypted message on its servers. If you need to send encrypted email to people using Outlook, Yahoo, or other providers, confidential mode will not work.
Confidential mode does two things: it sets an expiration date so the message disappears after a certain number of days, and it prevents the recipient from forwarding, copying, downloading, or printing the message. The recipient cannot see who else received it. This is useful for sending passwords, social security numbers, or other sensitive information to someone you trust, but it is not a substitute for full encryption if you are sending to non-Gmail users.
Key Takeaways
- Confidential mode in Gmail encrypts messages and prevents recipients from forwarding or copying them, but works only between Gmail accounts.
- You turn on confidential mode by clicking the lock icon when composing a message, then setting an expiration date and optional passcode.
- The recipient receives the message in Gmail but cannot forward it, copy text from it, download it, or print it.
- If you need to send encrypted email to non-Gmail users, you will need a third-party encryption service because Gmail's built-in feature does not support that.
How to enable confidential mode on a new message
Open Gmail in your web browser and click the Compose button to start a new message. Type the recipient's email address, subject, and message body as you normally would. At the bottom of the compose window, you will see several icons — look for a lock icon with a clock (it may also show as a shield). Click it.
A popup will appear asking you to set an expiration date. Choose how long the message should remain visible: 1 day, 7 days, 30 days, 1 year, or 5 years. You can also add an optional passcode — if you do, the recipient will have to enter a code to open the message, and you will send that code separately (not in the email itself). Click Save when you have made your choices.
The lock icon will now show as filled in, indicating confidential mode is on. Send the message as you normally would. The recipient will see the message in their Gmail inbox, but they will not be able to forward it, reply with quoted text, download attachments, copy the message, or print it.
What happens when the recipient opens a confidential message
The recipient sees the message in their inbox like any other email, but with a notice at the top saying it is in confidential mode and when it will expire. If you set a passcode, they will see a field asking them to enter it before they can read the message. Once they enter the passcode (or if there is no passcode), they can read the message on screen.
The recipient's options are limited. They cannot forward the message to someone else, reply with the original message quoted below their reply, copy and paste text from it, download any attachments, or print it. If they need to save the information, they will have to write it down or take a screenshot — and you will be able to see if they take a screenshot because Gmail notifies you.
Turning off confidential mode if you change your mind
If you have not sent the message yet, you can click the lock icon again to turn off confidential mode. The popup will reappear, and you can click Turn off or simply close the popup and send the message normally.
Once you have sent a confidential message, you cannot unsend it or change the settings. You can only wait for the expiration date to pass, which will remove the message from the recipient's inbox. If you set a passcode and the recipient has not opened the message yet, you can contact them separately to tell them not to open it, but Gmail will not prevent them from doing so if they have the passcode.
Sending encrypted email to non-Gmail users
Gmail's confidential mode does not work with Outlook, Yahoo, AOL, or other email providers. If you need to send an encrypted message to someone outside Gmail, you have two main options: use a third-party encryption service, or ask the recipient to create a free Gmail account so you can use confidential mode.
Third-party services like ProtonMail, Tutanota, or Virtru add encryption to Gmail without leaving the Gmail interface. These services require you to install an extension in your browser, and they work with any email provider. The setup is more involved than confidential mode, and the recipient may need to create an account or enter a password to read the message, depending on which service you use. Research which service fits your needs before installing anything.
Common mistakes when using confidential mode
The biggest mistake is assuming confidential mode makes your message completely secure. Google can still read your message because it is stored on Google's servers, and law enforcement can request it. Confidential mode is designed to prevent the recipient from sharing it, not to hide it from Google or the government. If you are sending information that must be hidden from all parties including Google, you need full end-to-end encryption, which confidential mode does not provide.
Another common mistake is forgetting that the recipient can take a screenshot. Gmail will notify you if they do, but the notification comes after the fact. Do not assume a screenshot notification means they did not save the information — they may have used a different method to capture it. Confidential mode prevents casual forwarding and copying, but it is not tamper-proof.
A third mistake is setting a passcode and then sending it in the same email. The whole point of a passcode is to send it through a separate channel so that even if someone intercepts the email, they cannot open it without the code. If you set a passcode, tell the recipient the code by phone, text message, or in person — not in the email itself.
When to use confidential mode and when to use something else
Use confidential mode when you are sending sensitive information to a Gmail user and you want to prevent them from forwarding it or copying it. Examples include sharing a password, a social security number, a credit card number, or a medical record with someone you trust. The expiration date ensures the message disappears from their inbox after a set time, and the screenshot notification gives you a heads-up if they try to save it.
Do not use confidential mode if you are sending to a non-Gmail user — it will not encrypt the message for them. Do not use it if you need the message to be hidden from Google itself, because confidential mode does not provide that level of security. Do not use it as a substitute for a secure password manager when sharing login credentials with a team, because the recipient cannot save the password or forward it to someone else who needs it.
Frequently Asked Questions
Can I use confidential mode on my phone?
Yes. Open the Gmail app, start composing a message, and tap the three-dot menu icon at the top. Select "Confidential mode" and set your expiration date and passcode. The process is the same as on a computer, just in a different location in the interface.
What happens if I set a 1-day expiration and the recipient does not open the message?
The message will disappear from their inbox after 1 day, whether they opened it or not. They will not be able to read it after that time. If they need the information, they should open it before the expiration date passes.
Can the recipient print a confidential message if they use a screen reader or accessibility tool?
No. Confidential mode prevents printing through any method, including accessibility tools. The restrictions apply to all recipients equally.
Does confidential mode work if I use Gmail through Outlook or another email client?
No. Confidential mode is a Gmail web feature and does not work if you access Gmail through a third-party email client like Outlook, Apple Mail, or Thunderbird. You must use Gmail's web interface or the Gmail mobile app to send confidential messages.
If I send a confidential message and then delete it from my sent folder, does it disappear from the recipient's inbox?
No. Deleting a message from your sent folder does not affect the recipient's copy. The message will remain in their inbox until the expiration date passes, at which point it will disappear automatically.