You screenshot the bug, the payment confirmation, the funny conversation — and in the corner sits your email, an account number, a colleague's name. Sharing safely takes two habits: redact what's visible, and strip what's invisible. Both take seconds, and both should happen on your device — an image that needs redacting is exactly the image that shouldn't be uploaded to a "free blur site".
Redact the visible
- Open Blur / Redact Image and drop the screenshot.
- Drag a box across each private bit — it pixelates instantly; add as many boxes as needed, undo if you overshoot.
- Switch to Blackout for anything that must not survive even as colour blobs (card numbers, API keys), then download.
This is true redaction: the pixels inside each box are destroyed before the file is written — averaged into mosaic cells or flattened to black — so the shared file simply does not contain the original data. That is the difference between redacting and covering, and it is why "remove the black box" attacks that work on PDFs do nothing here.
Pixels are destroyed on your device — the original never leaves it.
Strip the invisible
Photos (less so screenshots) carry EXIF metadata — and the dangerous field is GPS. Drop photos into the EXIF Viewer & Remover: it shows everything the file reveals, flags location data loudly, and produces a clean copy with the pixels untouched, byte for byte. Make it a reflex for marketplace listings, social posts from home, and anything with children in it.
The complete pre-share checklist
Redact visible identifiers → strip EXIF → and if the shot is going somewhere public-facing, make it look deliberate with the Screenshot Beautifier. Thirty seconds, all in the browser, and nothing about the screenshot — before or after — ever touched a server.