How to Send a Secret Memo That Only the Recipient Can Read

There are things you need to tell someone that shouldn't live in a chat history forever.

A Wi-Fi password, login credentials for a shared account, medical test results, a surprise party plan. We've all typed something sensitive into iMessage or Messenger and hit send without thinking twice. It's convenient in the moment, but that message stays on both devices indefinitely.

This guide explains why regular messaging apps are a bad choice for sensitive information, and how to send a secret memo that only your intended recipient can read.

7 Times You Need a Secret Memo

1. Sharing Login Credentials for a Shared Account

Netflix, Spotify, family iCloud -- when someone needs access, you need to share the password. Typing it into a chat means it sits there forever.

2. Sending a Wi-Fi Password to a Guest

A friend visits your home, or you're hosting an Airbnb guest. Your complex Wi-Fi password needs to get to them somehow, but you don't want it lingering in your messages.

3. Passing a Door Code or Safe Combination

Your dog walker needs the front door code. Your sibling needs the safe combination. These are numbers that absolutely should not live in a text thread.

4. Sharing Medical Test Results Privately

You want to share lab results with your spouse or a family member. Medical information is deeply personal and doesn't belong in a chat log.

5. Sending Tax or Financial Document Information

Your accountant needs a login, or you need to pass bank details to a family member. Financial data in a messenger app is an identity theft risk.

6. Passing Along Surprise Party Details

The venue, the time, who's bringing what -- you need to coordinate with guests without the birthday person seeing it. One wrong group chat and the surprise is ruined.

7. Sharing Sensitive Work Information with a Colleague

Unreleased project details, contract terms, HR announcements. Some work information should not exist in a Slack thread that anyone on the team can search.

Why Regular Messaging Apps Don't Work for Sensitive Info

iMessage, Messenger, Slack, email -- they all share the same fundamental problems when it comes to sensitive information:

Risk	Why It Matters
Chat history	Messages are stored permanently on both the sender's and recipient's devices
Cloud backups	iCloud, Google Drive, and app-specific backups sync your conversations
Screenshots & forwarding	Anyone can screenshot or forward your message to someone else
Device loss	A lost or stolen unlocked phone exposes every conversation
Search	Chat search makes it trivial to find passwords, account numbers, and codes

Even if you delete a message on your end, it still exists on the recipient's device. You have no control over how long your information lives.

What Makes a Good Secret Memo Service

If you need to send sensitive information, look for a service that checks these boxes:

• Password protection -- Only someone with the password can read the content
• Expiration / self-destruct -- The memo becomes inaccessible after a set time
• No account required for the recipient -- They just need the link and the password
• HTTPS encryption -- Data is encrypted in transit
• No ads or tracking -- Your content isn't being analyzed for advertising

How to Send a Secret Memo with LOCK.PUB

LOCK.PUB meets all of the criteria above. Here's how to send a secret memo in four steps.

Step 1: Write Your Memo

Go to LOCK.PUB and select the secret memo option. Type whatever you need to share -- passwords, addresses, codes, instructions.

Step 2: Set a Password

Choose a password that the recipient will need to enter to read the memo. Only people who know this password can see the content.

Step 3: Get Your Link

A unique URL is generated for your memo. Copy this link.

Step 4: Send the Link and Password Separately

Send the link through one channel (e.g., iMessage) and the password through another (e.g., a phone call or SMS). This separation is the key to security.

Pro Tip: Split the Link and Password Across Channels

This is the single most important thing you can do:

• Link via iMessage / Password via SMS
• Link via email / Password via phone call
• Link via Slack / Password via Messenger

If you send the link and password in the same message, anyone who intercepts that message gets everything. Splitting them across channels means both channels would need to be compromised simultaneously.

With LOCK.PUB's Pro plan, you can also set expiration times and access limits for even stronger protection.

Stop Leaving Sensitive Info in Your Chat History

The next time you need to share a password, a code, or anything private, don't paste it into a chat. Create a secret memo on LOCK.PUB -- it's password-protected, it expires, and it's free to use.

Create a Secret Memo -->