QRix
Black out names, numbers and secrets — permanently, not just visually.
Unlike simply drawing a rectangle in an editor (which can be removed to reveal the text underneath), this tool flattens each page during export, physically destroying the covered content. Draw boxes over anything sensitive — personal data, account numbers, signatures — then download a safe copy. Everything runs privately in your browser; the file never leaves your device.
It's free, private and works right in your browser — no signup, no watermark.