NSFW Tag

NSFW stands for "Not Safe For Work," an internet label applied to content that a person might not want to be seen viewing in a public or professional setting. The tag warns viewers that a link, image, or video may contain material such as nudity, pornography, graphic violence, strong profanity, slurs, or other potentially disturbing or workplace-inappropriate subject matter. By flagging content in advance, NSFW serves as a courtesy and a filter, letting people decide whether and where to open something rather than being caught off guard.

On Reddit, the NSFW tag is a formal moderation and content-control tool, and the platform requires that all not-safe-for-work content be marked as such. Authors and moderators can apply the NSFW label to individual posts—one of several post actions alongside locking and spoiler-tagging—and entire subreddits and even user profiles can be designated NSFW. Once tagged, images and videos are blurred by default and users must be signed in, confirm they are over 18, and opt in through their settings before the content displays. This system both shields unsuspecting or underage users and lets Reddit algorithmically separate adult material from general feeds, making the NSFW tag central to the site's age-gating and advertising-safety practices.