Privacy · July 13, 2026
How to blur sensitive information in a Mac screenshot
Sharing a screenshot is easy — accidentally leaking an email address, API key, or bank balance inside it is just as easy. Here are four ways to blur or redact sensitive information in a Mac screenshot, from the built-in tools to the fastest automatic option.
1. macOS Markup (no real blur)
Open the screenshot in Preview, click the Markup icon, and you'll find shapes and text — but no blur or pixelate tool. The workaround is to draw a rectangle, set its fill to a solid opaque color, and place it over the sensitive area. It's free and reliable, but manual and not pretty.
2. Photos Retouch (erase, don't blur)
The Photos app has a Retouch tool that paints over content using nearby pixels. It removes rather than blurs, which works for small stray details but smears badly over blocks of text.
3. A dedicated app with manual blur
Tools like CleanShot X and Shottr add proper blur and pixelate brushes you drag over sensitive regions. This looks cleaner than a Markup rectangle, but you still have to find and cover every piece of sensitive data yourself — and it's easy to miss one.
4. Automatic redaction (the fast way)
The problem with manual methods is human error — one missed email and the whole point is lost. Automatic redaction solves that. SuperSnap's Restricted mode scans the screenshot and blurs sensitive patterns — emails, API keys, phone numbers, balances — for you, before you export. You beautify and redact in the same 30-second flow, and nothing is ever uploaded: it all happens on your Mac.
Redact automatically with SuperSnap
Turn on Restricted mode and sensitive data is hidden for you — no manual selecting. $9 one-time, free plan available.
Which method should you use?
For a one-off, a Markup rectangle is fine. If you share screenshots regularly — especially of dashboards, terminals, or inboxes — automatic redaction is safer and far faster, because it doesn't rely on you spotting every sensitive value by eye.
FAQ
Can you blur part of a screenshot on Mac without an app?
Not with true blur. macOS Preview and Markup can't blur — the closest built-in option is to draw a filled solid rectangle over the sensitive area using Markup's shape tool, or use the Photos app Retouch tool to erase it. For an actual blur or pixelation effect you need a third-party app.
Is blurring or pixelating safe for hiding sensitive data?
Light blur and coarse pixelation can sometimes be reversed, especially for short predictable text like PINs. For anything truly sensitive — API keys, passwords, account numbers — use a solid, opaque redaction (a filled block) or a tool that fully removes the underlying pixels rather than just softening them.
How do I automatically hide emails and API keys in screenshots?
Use a tool with automatic redaction. SuperSnap's Restricted mode detects sensitive patterns like emails, API keys, and balances and blurs them for you before you export — no manual selecting required.