Redact a Screenshot
Blur, pixelate, or black out anything sensitive before you share. Auto-detect can even find emails and phone numbers for you, all without the image leaving your browser.
- 100% free
- No upload, runs in your browser
- No signup
- No watermark
How to redact a screenshot
Permanently hide sensitive information in a screenshot before sharing it.
Load the screenshot
Drag it in, paste with ⌘V / Ctrl+V, or click to choose the file.
Choose a redaction style
Blackout is the safest. Strong pixelation is a good middle ground. Light blur is the prettiest but weakest, so avoid it for passwords or keys.
Mark the sensitive areas
Drag boxes over emails, names, tokens, or faces. Or press “Auto-detect” to let on-device OCR suggest regions, then review them.
Export and verify
Download the PNG, then zoom in and confirm every secret is unreadable before you share it.
What this tool does
- Three redaction styles: blackout (safest), strong pixelate, blur
- Drag rectangles over anything sensitive. Remove or re-do any region
- Experimental auto-detect finds emails, phone numbers, and long tokens via on-device OCR
- Exports at full resolution as PNG, or copy to clipboard
- Nothing is uploaded. Redaction happens locally, as it should
Redact on Mac without opening a browser
Pizazoo’s native editor redacts in one click and its AI keeps every screenshot organized. 100% on-device, so sensitive captures never leave your Mac.
Frequently asked questions
Is blurring enough to hide a password or API key?
Often not. Researchers have reconstructed text from light blurs, and even from pixelation. A solid box is safer than blur: Blackout paints an opaque box over the region, so there is nothing left to un-blur. This tool starts in Blackout mode for that reason.
How do I blur part of a screenshot?
Load the screenshot, set Redaction style to Blur, and drag a box over each area you want hidden. The style applies to every box, and you can remove a box with its ✕ chip or undo with ⌘Z / Ctrl+Z. Then download the redacted PNG. For passwords, keys, or account numbers, switch to Blackout instead.
How do I hide details in a screenshot before sharing it?
Cover them with boxes. Keep the Blackout style and drag over names, emails, phone numbers, addresses, and account numbers, or press Find emails & numbers to let on-device OCR suggest regions. Download the PNG, then zoom in and check that nothing is still readable, including small text in headers and notifications.
How do I black out text in a screenshot?
Blackout is the default style, so just drag a rectangle over the text. Each region is filled with solid near-black, and the exported PNG contains only those final pixels, with no hidden layer underneath.
Does auto-detect send my image to an AI service?
No. Auto-detect runs Tesseract OCR compiled to WebAssembly inside your browser. The OCR engine downloads once (a few MB); your image stays on your machine.
Is the redaction really permanent in the exported file?
Yes. The exported PNG contains only the final pixels. Redacted regions are destructively overwritten. There is no hidden layer that could be peeled back.
Can auto-detect miss things?
Yes, but treat it as a helper, not a guarantee. It looks for emails, phone-like numbers, and long token-like strings, but you should always review the image before sharing.
How do Mac users do this faster?
Pizazoo for macOS includes one-click redaction tools in its native editor and keeps your whole screenshot library private and offline.