How to edit a screenshot on a Mac
Short answer: open the screenshot in Markup and use the crop, text, shape and rotate tools, then save or copy it. The quickest way in is to click the thumbnail that flashes up in the bottom corner the moment you capture; for one you already saved, open it in Preview and click the Markup button. The built-in tools cover almost everything you would want, with one real gap: there is no blur or pixelate, so to actually hide sensitive detail rather than draw over it you need something that scrubs the pixels. Here is the full workflow, and where the gap matters.
Edit a screenshot the moment you take it
macOS captures screenshots with a handful of keyboard shortcuts, and each one feeds straight into the same editor.
| Shortcut | What it captures |
|---|---|
| Shift-Command-3 | The entire screen |
| Shift-Command-4 | A portion you drag a crosshair over |
| Shift-Command-4, then Space | A single window or menu |
| Shift-Command-5 | A toolbar with capture options, a timer and the save location |
After you capture, a thumbnail appears for a few seconds in the bottom-right corner. Click it before it disappears and the shot opens in Markup, where you can edit it right away and never touch a file on disk. Let it slide away and it saves to the Desktop instead, ready to edit later in Preview. The thumbnail is the fast path; Preview is the one for anything you already saved.
How to crop a screenshot on a Mac
Cropping is the edit people reach for most, usually to trim a full-screen grab down to the part that matters. There are two ways, depending on where the screenshot is.
- In Markup, from the thumbnail editor, use the Crop tool in the toolbar and drag the handles to set the frame.
- In Preview, for a saved screenshot, drag a rectangle over the part you want to keep, then choose Tools then Crop, or press Command-K.
Cropping genuinely removes the pixels outside the frame, so it is the right move when the thing you want gone is at the edge of the shot. When it sits in the middle of something you need to keep, cropping takes the context with it, and you are better off covering that part instead. The trade-off between cropping and redacting is worth a look if you find yourself cropping by reflex.
How to add text, arrows and annotations
Markup is the same tool set whether you open it from the thumbnail or from Preview, and it handles the everyday annotations:
- Shapes and arrows to point at something, including a loupe that magnifies a region to draw the eye to it.
- Text to add a label or caption, with control over the font, size and color.
- Sketch and draw for freehand marks. Sketch a rough shape and macOS will offer to tidy it into a clean one.
- Highlight for a highlighter pass, and Sign to drop in a saved signature.
- Rotate to turn the image, plus shape, border and color styles for everything above.
How to edit a screenshot after it is saved
Once a screenshot is on the Desktop, Preview is the editor. Double-click to open it, then click the Markup button (the pen tip) to reveal the same crop, shape, text and rotate tools as the thumbnail editor. To change the dimensions rather than the framing, choose Tools then Adjust Size and set the width, height or resolution. You can also press the Space bar on a selected file to open Quick Look, which carries the Markup tools too, so you can annotate without fully opening anything.
How to copy, paste and save your edited screenshot
By default a screenshot lands on the Desktop as a PNG, named with the date and time it was taken. Two things are worth knowing so the editing fits how you actually share:
- The Options menu in the Shift-Command-5 toolbar changes where shots save, sets a timer, and toggles the corner thumbnail, so you can route them to Documents, Mail or the clipboard instead of the Desktop.
- Adding Control to any capture shortcut, such as Control-Shift-Command-4, copies the screenshot straight to the clipboard without writing a file. Paste it where it needs to go with Command-V.
Preferring the clipboard is also a tidiness habit: a screenshot you never saved is one less unedited original sitting in a folder. That matters more than it sounds when the shot has something private in it.
The one thing Markup cannot do: blur or pixelate
For all its tools, Markup has no blur or pixelate option. When a screenshot contains something that should not travel, an API key, a customer email, a bank balance, a face, people improvise by dropping a solid black rectangle over it. That looks final, but the box is a separate layer sitting on top of the picture, and saved in the wrong format it can be nudged aside or lifted off to reveal what was underneath. Even drawing over text is not the same as removing it. I have written up exactly when covering text in Preview actually hides it, and the answer is: less often than it looks.
The reliable move is to redact, which means replacing the sensitive pixels rather than covering them. This is the gap ScrubShot fills: it captures with a shortcut like the built-in tools, but its Scrub tool pixelates the area straight into the image, so there is no overlay to remove and no original detail left in the file. You still get a Marker, Text and Crop for ordinary edits, and all of it happens on your Mac without anything being uploaded.
So the rule of thumb is simple. For arrows, captions and trimming, the built-in Markup tools are genuinely enough and need no extra app. The moment the screenshot has something in it you need to hide before sharing on your Mac, reach for a tool that scrubs the pixels, and know the difference between blurring and pixelating so the thing you hid stays hidden. If you are weighing whether you need anything beyond what ships with macOS, I compare the built-in Mac tools against ScrubShot in full.
FAQ
- How do I crop and edit a screenshot on a Mac?
- Click the thumbnail that appears in the corner right after you take the shot to open Markup, or open a saved screenshot in Preview. Both give you the same tools: use Crop to trim the frame, the shape and arrow tools to point at something, and the text tool to label it. Save when you are done, or copy it to the clipboard.
- How do I edit text on a screenshot on my Mac?
- Use the text tool in Markup to add a new text box on top of the image, then pick the font, size and color with the text style control. This adds your own label or caption; it does not let you change words that are already part of the picture, because a screenshot is a flat image rather than editable text.
- Can you edit the text that is already inside a screenshot?
- Not with the built-in tools. A screenshot is a flat image, so the words in it are pixels, not characters you can retype. Markup can draw over them or add new text beside them, but it cannot rewrite them. If the goal is to hide text like an email or an account number, you do not edit it, you redact it by pixelating it into the image so it cannot be read or recovered.
- Where do edited screenshots save on a Mac?
- By default a screenshot saves to the Desktop as a PNG, named with the date and time it was taken. You can change where they land with the Options menu in the Shift-Command-5 toolbar, or add Control to the capture shortcut to copy the shot straight to the clipboard without saving a file at all.
Try it
ScrubShot is a Mac app that adds the one thing Markup is missing: it pixelates sensitive areas into the image so they cannot be recovered, all on-device. Press the shortcut, scrub out the private bits, crop or label the rest, then copy or save. There is a free 7-day trial with no card required. After that it is $30 once, with lifetime updates and no subscription.