How to blur text in a photo on a Mac

The quickest way to blur text in a photo on a Mac is the Photos app: open the image, click Edit, pick the Retouch tool, and drag it over the words. Preview has no blur tool at all, so there you cover the text with a shape instead. But read this first: a blur hides text, it does not remove it, and for a password or an account number that difference matters. Blurring is fine when you want a soft look, a messy background gone or a stranger's face out of a blog photo. It is not safe for hiding a secret, because a blur can be estimated back and pixelation can be reconstructed outright.

The fastest way to blur text on a Mac

Two tools ship with every Mac, and neither is a true blur, so it helps to know exactly what each one does before you reach for it.

1. Photos, using Retouch. Open the photo in Photos, click Edit at the top right, then choose Retouch from the tools on the right. Set the brush size and drag it across the text. Retouch is a healing tool, so it samples nearby pixels and paints over the area, which reads as a soft smudge rather than a clean blur. Click Done to save. This is the closest thing to a blur that Apple gives you out of the box.
2. Preview, using a shape. Open the image, click the Markup icon, choose the rectangle or oval, and drag it over the text. Preview has no blur, so this covers rather than blurs. Set the fill color and, if you want the softened look, drop the opacity a little. Save with File then Export to bake the shape into a fresh file.
3. A third-party editor, for a real blur. If you want an actual adjustable Gaussian blur, you need something beyond the built-ins. Photopea runs free in a browser (select the area, then Filter, Blur, Gaussian Blur, and set the radius). CleanShot X and similar screenshot tools offer a blur or pixelate brush you paint on directly.

Blur methods on a Mac, compared

Each option trades effort for control, and one column matters more than the rest: whether the method is safe for hiding a secret. The honest answer for every blur is no, which is the point most guides skip.

Does Preview have a blur tool?

No, and it never has. Preview's Markup toolbar gives you shapes, text, a signature and a highlighter, but no blur or pixelate option. The common advice is to draw a rectangle over the area, which works, but be clear about what it is: a cover, not a blur. If you leave the fill semi-transparent to fake the blurred look, the words underneath stay legible when someone raises the brightness and contrast. So for a soft aesthetic touch a light shape is fine, and for anything you actually need hidden, set the fill to solid black at 100 percent opacity and export a new flattened file rather than saving over the original.

Is there a blur tool in Apple Photos?

Not a dedicated one. The tool people reach for is Retouch, and it is worth knowing it is a healing brush, not a blur. It samples the pixels around your stroke and paints them over the spot, which is built for removing a spot or a blemish. Dragged across a line of text it leaves a smeared patch that reads a bit like a blur. That is genuinely useful for a quick, casual hide, but it is not an adjustable blur, and a light or rushed stroke can leave faint ghosts of the original. For a clean, controllable blur you are back to a third-party editor.

The catch: a blur hides text, it does not remove it

Here is the part almost every blur tutorial leaves out. Blurring and pixelating obscure information, they do not delete it, and, as I work through in whether a blurred or pixelated image can be reversed, both can be undone. In 2022 Dan Petro at Bishop Fox released a tool called Unredacter that reconstructs pixelated text. It renders each candidate word in the same font, pixelates the guess with the same settings, and matches it against the redacted image, walking character by character. It builds on an earlier tool, Depix, from 2020. Pixelation is deterministic and local, so there is a mapping to solve, and it is strongest on exactly the short, structured text people tend to blur: account numbers, codes, passwords. A blur is not a stronger version of this. It is a weaker one, and a low-radius blur can be estimated back. If the thing under the blur is a secret, treat the blur as decoration, not protection.

That is why hiding a secret is a different job from blurring for looks, and it needs a different method. The safe route is to cover the area with a solid, fully opaque fill and flatten it into a new file, or to use a tool that destroys the pixels underneath. I wrote a full walkthrough of the safe approach in how to redact a screenshot on a Mac, including the real cases where a blur or a black box leaked, and how to check your result before you share it.

When a blur is fine, and when it is not

The rule is simple. Blur for aesthetics, redact for secrets.

• A blur is fine when the blurred thing is not itself the secret: softening a busy background, taking a passer-by's face out of a photo, drawing the eye to the subject, or giving a screenshot a tidier look. If someone recovering it would learn nothing they could use, a blur does the job.
• A blur is not enough the moment the hidden content is the point: a password, an API key, an account or card number, a home address, a name, an email, a license or reference code. For those you need real redaction, because a reconstructed blur hands over exactly the value you were trying to hide.

How ScrubShot handles it

Blurring is a couple of tools away and easy to get wrong, so I built ScrubShot to make the safe version the default. Press Fn + Space and it captures the whole screen with ScreenCaptureKit and opens it in an editor. You crop afterwards rather than fighting a drag selection.

The Scrub tool is the part I care about. A normal pixelate sets each block to the average of the pixels beneath it, which is the exact signal Depix and Unredacter exploit. ScrubShot does not do that. It uses what I think of as a content-independent scramble: each mosaic block is filled from a few pixels sampled at random from across the whole selected region, so the block pattern is decoupled from whatever sat underneath. It looks like a censor and keeps the rough colors of the area, but there is no per-block relationship to the original text to solve for. It reverses to nothing by design, and the scrub is baked straight into the image, so the original pixels are gone, not hidden on a removable layer.

The capture, scrub and share flow makes no network connections, so a screenshot with a password or a client's details in it never leaves your Mac. ScrubShot runs on macOS 14 and later, on both Apple Silicon and Intel.

FAQ

How do I blur something in a picture on my Mac?

The fastest built-in way is the Photos app: open the image, click Edit, choose Retouch, set a brush size and drag it over the area. Retouch smears the pixels rather than adding a true Gaussian blur, so it reads as a soft smudge. For an actual blur you need a third-party editor like Photopea or CleanShot X, since neither Photos nor Preview has a real blur slider.

Does Mac Preview have a blur tool?

No. Preview has never had a blur or pixelate tool. The workaround people use is Markup: draw a rectangle or oval over the area and set its fill. If you leave the fill semi-transparent to mimic a blur, the text underneath is still readable, so for anything sensitive set the fill to solid black at full opacity, which is a cover, not a blur.

Is there a blurring tool in Apple Photos?

Not a dedicated one. The closest is Retouch, which is a healing tool: it samples nearby pixels and paints over the spot to remove blemishes, so dragging it across text leaves a smudged patch rather than a clean blur. It works for hiding a small mark, but it is not a blur slider and it can leave faint traces if you drag too lightly.

Is blurring text safe for hiding a password or account number?

No. A blur obscures text, it does not remove it, and pixelation can be reconstructed outright. Bishop Fox's Unredacter, and Depix before it, recover pixelated characters by re-pixelating font guesses and matching them, and a blur is a weaker version of the same thing. To hide a password, account number or address, cover it with a solid opaque fill or use a tool that scrambles the pixels, not a blur.