Is this a real redaction, or just a black box on top?

A real one. The area is replaced in the exported image, so there is no hidden layer underneath for someone to remove — the failure mode that has embarrassed a lot of organisations.

Is it safe for a document under NDA?

The image never leaves your browser, so no third party ever holds a copy of the unredacted version.

Redact a Screenshot

Permanently black out sensitive text in a screenshot or scan before you send it on. Redaction is applied in your browser and cannot be undone by the recipient.

Runs entirely in your browser — your file is never uploaded.

Questions

Is this a real redaction, or just a black box on top?: A real one. The area is replaced in the exported image, so there is no hidden layer underneath for someone to remove — the failure mode that has embarrassed a lot of organisations.
Is it safe for a document under NDA?: The image never leaves your browser, so no third party ever holds a copy of the unredacted version.

Censor a Screenshotscreenshots
Blur Part of an Imageimages
Remove EXIF Data From Photosphotos

Or open the full Retouch tool.

Questions

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