There are several ways to blur, redact and cover sensitive information with Preview on Mac for free.
--CHAPTERS--
00:00 - Intro
00:19 - Use Shapes to Cover Sensitive Info
01:11 - Use Blur Pattern
02:12 - Make Shape Same as Background
03:15 - Redact in PDF with Preview
04:43 - Redact in Images by Converting to PDF
05:17 - Blur Images with Preview
07:15 - Blur Photos with Preview
09:06 - Revert Images
Sources:
https://apple.stackexchange.com/quest...
/ program_for_mac_in_which_i_can_find_blur_f...
Preview Redact:
https://support.apple.com/guide/previ...
https://discussions.apple.com/thread/...
Preview User Guide:
https://support.apple.com/guide/previ...
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