What Is Content Moderation?
Content moderation is the process of reviewing user-generated content against a set of rules and removing, hiding, or flagging anything that violates them, to keep a platform safe, on-topic, and compliant.
Definition
Content moderation is how online platforms decide what user-generated content is allowed. That content includes chat messages, comments, forum posts, usernames, profiles, and uploaded images. Moderation compares each item against a platform's policy and then allows, removes, hides, or escalates it. The aim is to protect users from harm (harassment, hate, scams, sexual content, self-harm) and to keep the platform compliant with regulations such as COPPA and the GDPR, without frustrating legitimate users through over-blocking.
The main types
- Pre-moderation: content is checked before it goes live. Safest, but adds latency.
- Post-moderation: content publishes immediately, then gets reviewed. Faster UX, but harmful content is briefly visible.
- Reactive moderation: content is reviewed only when a user reports it. Cheap, but slow and inconsistent.
- Automated moderation: software checks content in real time, usually with AI. Scales to millions of messages and is the backbone of most modern platforms.
In practice, most platforms combine automated moderation for scale with human review for the ambiguous cases.
How automated moderation works
An automated system sends each piece of content to a classifier or language model that scores it across categories such as hate, harassment, sexual content, violence, self-harm, PII, and spam. If a score crosses a configured threshold, the content is flagged or blocked. Strong systems first normalize text to defeat evasion tactics, so sh1t and unicode look-alikes are caught the same as the plain spelling. See our guide to AI profanity filtering for a deeper look, or try the free moderation tester.
Where content moderation is used
Anywhere users can post content: multiplayer games, forums and communities, dating and social apps, marketplaces, AI chat products, and social media comments. Each has different risks, which is why a good moderation system lets you set your own policy rather than forcing one taxonomy.
How to add it to your app
The fastest route is a content moderation API: you send user content to an endpoint and get a decision back in real time, with no models to train or host. That is what Paxmod provides, for text and images, across 13 categories, with custom policies you write in plain English, from $0.25 per 1,000 messages.
Frequently Asked Questions
What are the main types of content moderation?
Pre-moderation, post-moderation, reactive moderation, and automated moderation. Most platforms combine automated moderation for scale with human review for edge cases.
How does automated content moderation work?
Each item is scored by a classifier or LLM across harm categories; anything above your threshold is flagged or blocked, ideally after normalizing text to catch evasion.
How do I add content moderation to my app?
Use a moderation API. Send content to an endpoint, get a real-time decision back, no models to train or host.
Add moderation to your app in minutes
Real-time text and image moderation with custom policies. Free to start, no credit card.