How to blur something in a screenshot on iPhone

iPhone has this built in, and for a single phone number in a single screenshot it is genuinely all you need. Here is how to do it with Markup, the two mistakes that make it fail, and when it is worth reaching for something else.

The built-in way: Markup

1. Open the screenshot in Photos and tap Edit.
2. Tap the Markup button — the pen tip in the top-right row.
3. Tap + → Add Shape → the filled square, and drag it over what you want hidden. Set its fill to a solid colour with the colour swatch.
4. Resize it so it covers the whole thing, then tap Done → Done.
5. Share the edited image. The shape is flattened into the file you send.

If that covered everything you cared about, you are finished. You do not need an app for this.

The two mistakes that make it fail

1. The highlighter is not a cover

Markup's highlighter is translucent by design. Drawn over a phone number it looks redacted at a glance and the digits are still legible when someone zooms in. Use a shape with a solid fill, or the pen at full opacity — never the highlighter.

2. Missing the second thing

This is the one that actually catches people. You cover the account number in the middle of the screenshot and post it with an email address still sitting in the notification banner at the top, or a full name in the tab title, or a face in a contact avatar. Nobody reviews their own screenshot as carefully as a stranger reads it.

Worth knowing too: in Photos, Revert to Original undoes your edit on your own device. The copy you send is flattened and safe, but the version in your library is not the redacted one.

What about pixelating or blurring instead of a black box?

A heavy blur or a coarse mosaic is fine, and it looks less accusatory than a black rectangle. A light one is not: weak pixelation over a known font — which is what every phone number and email address is — carries enough signal that it can be reversed. If you blur, blur hard enough that you cannot tell there was text there.

When it is worth using a tool instead

Markup is manual, which is exactly why the second mistake above happens. If you share screenshots often — support tickets, bug reports, demos of your own product, anything with a customer's data on it — the useful thing is not a nicer blur, it is something that goes looking for what you would have missed.

That is what Snapdraft does. It runs Apple's Vision framework on your phone to find phone numbers, emails, addresses, card and account numbers, API keys, names, QR codes and faces, blurs all of them, and then lets you tap any blur off or drag a new one on. Nothing is uploaded — there is no server to upload it to — and every detection feature is free.

Quick answers

Does blurring a screenshot on iPhone actually remove the data?

In the image you share, yes — Markup edits are flattened into the exported file, so the pixels underneath a solid shape are gone. What survives is the unedited original in your own photo library, which Revert to Original will bring back on that device.

Can someone un-blur a screenshot?

A solid cover, no. A light blur or coarse pixelation over text in a known font, sometimes — there are tools that make a decent guess. Use a strong blur or a solid shape for anything that matters.

How do I blur a face in a screenshot on iPhone?

Same Markup steps — a filled shape over the face. Snapdraft detects faces automatically and covers each one with a blurred ellipse, with an optional emoji on top so it reads as anonymous rather than censored.

Is there a free way to redact a screenshot on iPhone?

Markup, above, is free and built in. Snapdraft's detection, manual blur and both save modes are also free; the only paid thing is removing a small watermark from the image you save.