Mac's built-in screenshot tools let you crop, draw, add text, and magnify without opening a separate app

When you take a screenshot on Mac using Command-Shift-4 or Command-Shift-5, a small editing window appears in the corner of your screen. Click that thumbnail and you enter the Markup editor — the built-in tool that handles most screenshot edits you'll need. You can crop the image, draw lines and shapes, add text boxes, blur sensitive information, and adjust colors, all without leaving the screenshot itself.

The editing window stays open for a few seconds after you capture. If you miss it, open the screenshot file (usually saved to your Desktop) and press Space to open Quick Look, then click the Markup button in the toolbar. From there, the same editing tools are available.

Key Takeaways

  • Click the screenshot thumbnail that appears in the corner to open Markup and edit when ready after capturing.
  • Crop by dragging the corner handles inward, or use the crop tool from the toolbar to select a specific area.
  • Draw, add text, and blur using the toolbar buttons — no additional software needed.
  • If you close the editing window, open the screenshot file and press Space, then click Markup to edit later.

Cropping and resizing your screenshot

When the Markup editor opens, look for the crop tool in the toolbar — it looks like two overlapping right angles. Click it, then drag the corner handles of the image inward to remove unwanted edges. You can also drag from the middle to move the entire crop area without resizing it.

If you want to crop to a specific size or aspect ratio, use Command-Shift-5 instead of Command-Shift-4 when you first capture. This lets you set the exact dimensions before you take the screenshot, which is faster than cropping afterward. Once you've set your selection, press Space to lock it in place, then click to capture.

Drawing, text, and annotation tools

The Markup toolbar contains a pen tool for freehand drawing, a line tool for straight edges, and shape tools for rectangles and circles. Click the pen icon and choose your color from the color picker — click the small arrow next to the color square to see more options. The thickness slider below the color picker controls how wide your lines are.

To add text, click the text tool (it looks like a capital A) and click anywhere on the image where you want the text to appear. A text box opens and you can type directly. Adjust the font size using the slider, and change the color the same way you would for drawn lines. Text boxes can be moved by dragging them, and resized by pulling the corner handles.

Blurring and masking sensitive information

If your screenshot contains passwords, email addresses, or other information you don't want visible, use the blur tool. Click the magnifying glass icon in the toolbar, then drag across the area you want to obscure. The blur is applied when ready and can't be undone without closing the editor without saving, so be precise.

You can blur multiple areas in one screenshot by dragging again in a different location. Each blur is independent, so if you make a mistake, close the editor without saving and start over. Once you're satisfied, click Done to save the changes to the original file.

Adjusting colors and contrast

The Markup editor includes basic color adjustment tools. Look for the sliders icon in the toolbar — it opens controls for brightness, contrast, and saturation. These adjustments explore to the entire image, not just a selected area. Drag each slider left to decrease the value or right to increase it, and watch the preview update in real time.

If you want to invert colors (useful for making light screenshots easier to read on a dark background), click the three-dot menu in the Markup toolbar and select Invert Colors. This reverses all colors in the image at once. Unlike the slider adjustments, color inversion can't be partially applied — it's all or nothing.

Saving and sharing your edited screenshot

When you finish editing, click Done in the Markup window. The changes save to the original screenshot file on your Desktop (or wherever you set screenshots to save). If you want to keep the original unedited version, use File > Duplicate in Finder before you edit, so you have a backup.

To share the edited screenshot, drag it from your Desktop into an email, message, or document. You can also right-click the file and select Share, which opens a menu of apps you can send it to — Mail, Messages, AirDrop, and others depending on what's installed on your Mac.

When to use Preview instead of Markup

Markup handles most everyday edits, but Preview (the default image viewer on Mac) offers a few additional tools. Open a screenshot in Preview and click Tools in the menu bar to access annotation options, including a signature tool and the ability to add multiple text boxes with different fonts in one go. Preview also lets you rotate and flip images, which Markup doesn't do.

For more complex edits — layering images, using filters, or working with transparency — you'll need a dedicated design app like Pixelmator Pro or Affinity Photo. But for cropping, drawing, blurring, and adding text to a single screenshot, Markup is built in and requires no learning curve.

Frequently Asked Questions

Can I undo changes after I click Done?

No. Once you click Done, the changes are saved to the file permanently. If you make a mistake, close the Markup editor without clicking Done and the original screenshot remains unchanged. You can then open it again and edit differently.

Where do my screenshots save by default?

Screenshots save to your Desktop unless you change the setting. Open System Settings, go to General > Screenshots, and choose a different location from the dropdown menu. You can also save to a specific folder, iCloud Drive, or have the screenshot copied to your clipboard instead of saved as a file.

Can I edit a screenshot that's already in a folder?

Yes. Find the screenshot file in Finder, press Space to open Quick Look, and click the Markup button in the toolbar. The same editing tools appear, and changes save to that file in its current location.

What's the difference between the pen and line tools?

The pen tool draws freehand — your mouse or trackpad movement creates the line shape. The line tool draws straight edges between two points. Click once to set the starting point, then click again where you want the line to end.

Can I change the blur strength or make it partially transparent?

No. The blur tool applies a fixed blur that completely obscures the area underneath. If you need a lighter blur or transparency effect, use Preview or a design app instead.