How to Use Invisible Ink in iMessage

Invisible ink blurs a message until the recipient swipes across it. It is a small feature Apple has carried since iOS 10, and it is genuinely useful for spoilers, surprises and anything you would rather did not appear in full on a lock screen.

Sending one

1. Type your message in Messages, or attach a photo.
2. Press and hold the blue send arrow. Do not tap it.
3. The Send with effect screen appears. Choose Invisible Ink from the Bubble tab.
4. Tap the send arrow beside the preview.

The recipient sees a shimmering grey cloud where the text should be, and swipes to reveal it. It re-blurs after a moment, and can be revealed again as many times as they like.

The most common failure is tapping the arrow instead of holding it. If nothing happens, hold longer, and make sure you are pressing the arrow rather than the text field.

It works on photos too

Attach an image, then hold send in exactly the same way. The photo arrives obscured and is revealed by swiping.

This is the more useful application. A photo preview appears in notifications and in the conversation list; invisible ink prevents that, which is handy for a surprise, a spoiler, or a screenshot you would rather did not display itself over someone’s shoulder.

Blue bubbles only

Invisible ink is an iMessage feature, not an SMS one. It works only when both people are on Apple devices and the bubble is blue.

Send to a green bubble and the effect is stripped. The recipient gets your text in the clear, with no indication that anything was meant to be hidden. Check the bubble colour before relying on it for anything you actually wanted concealed.

The same applies if the recipient’s phone falls back to SMS because they have no data connection.

When the effect does not play

If effects are not appearing at all, the usual cause is an accessibility setting rather than a fault.

Go to Settings, Accessibility, Motion and check Reduce Motion. With it on, message effects are disabled, and there is a separate Auto-Play Message Effects toggle underneath it.

This matters in both directions. If your recipient has Reduce Motion enabled, they may see your message without the effect. It is not a reliable privacy mechanism for that reason.

The other effects

The same press-and-hold screen offers several others, split across two tabs.

Bubble effects change how the message itself arrives: Slam lands it hard, Loud enlarges it, Gentle shrinks it, Invisible Ink hides it.

Screen effects take over the whole display: balloons, confetti, lasers, fireworks, and a few others. Some trigger automatically from keywords, which is why typing certain congratulations phrases sets off an animation you did not ask for.

What it does not do

Worth being clear, because the name suggests more than it delivers.

Invisible ink is a visual effect, not encryption and not self-destruction. The message stays in the conversation permanently, can be revealed any number of times, and can be screenshotted like anything else. iMessage is encrypted in transit regardless of whether you use the effect.

It also does not stop the message being read on a Mac or iPad signed into the same account, or by anyone who picks up an unlocked phone.

Treat it as a courtesy for spoilers and surprises. For anything genuinely sensitive, the thing that protects you is a locked phone and a message you did not send in the first place.

Hiding previews instead

If your actual concern is messages appearing on the lock screen, there is a proper setting for it.

Under Settings, Notifications, Show Previews, choose When Unlocked or Never. That applies to every message from everyone, permanently, and does not depend on the sender remembering to do anything.

For anything you actually need kept private, hiding photos on iPhone has the same caveats.