Blackout Text on Screenshot Online
Permanently black out personal identifying information (PII), phone numbers, bank balances, and private messages on screenshots. Works 100% in client browser memory with zero server uploads.
Why the iPhone Markup Pen Leaks Your Text
Many users try to redact bank statements or chat screenshots on iOS by scribbling over words with the default black pen in Apple Photos. Here is why this practice routinely leads to identity and credential theft:
The Apple Markup brush is designed for annotating, not security. It has a default opacity level around 85-90%. Even after 5 overlapping strokes, luminance data remains embedded in the file.
Anyone can open the image in basic photo apps, slide "Exposure" and "Brilliance" to +100, and lower "Shadows" to make the blacked-out text legible in seconds.
Bluro overwrites the canvas pixel buffer with opaque RGB(0,0,0) before export. The original pixel data is physically erased and replaced with flat black.
Frequently Asked Questions
Is Bluro safe for legal and medical PII?
Yes. Because image processing is performed entirely client-side using JavaScript in your browser memory, screenshots are never sent over the Internet, complying with strict zero-storage policies.
Can I match dark theme or light document backgrounds?
Yes. Use the Dark Theme (#181b22) or Document Whiteout (#ffffff) buttons on the workbench to create seamless redactions that match your application background.