Brand Safety: How Advertisers Can Avoid Underblocking and Overblocking Ad Placements
What if your ads aren’t reaching the people you want, but are still showing up in places you never approved? That’s the hidden problem with keyword overblocking and underblocking. When you overblock, your brand loses visibility in safe and relevant environments, allowing competitors to dominate the spaces you should have owned. When you underblock, your ads risk appearing next to unsafe or irrelevant content, hurting your brand reputation and audience trust. This creates a clear domino effect: lost reach, weaker impact, wasted budgets, and declining brand credibility. And most brands don’t even realize that these issues start with one flawed assumption; that keyword blocking alone can keep their ads safe. In this blog, we break down why keyword blocking as a brand safety strategy is fundamentally limited, what brands really need to understand about ad placement quality, and how they can make better, context-aware decisions. We’ll also explore how mFilterIt’s brand safety solution gives you accurate, real-time visibility and ensures your ads show up exactly where they should, without compromising reach or brand reputation. What is Underblocking and Overblocking of Ad Placements and What Causes Them? Underblocking happens when ads appear next to content that is unsafe, unsuitable, or misaligned with the brand’s image. This includes news about violence, misinformation, hate speech, extremist views, or overly negative content. What causes underblocking of ad placements? Relying only on basic keyword blocklists methods No understanding of page-level meaning, intent, or sentiment Filters that cannot interpret regional languages or cultural context Lack of monitoring of publishers, apps, or channels Limited detection of low-quality or fraudulent environments Overblocking occurs when ads are restricted from being placed next to content that is actually safe, relevant, and appropriate. This reduces delivery scale and prevents ads from reaching potential audiences. What causes overblocking of ad placements? Relying on broad keyword filters One-size-fits-all global safety settings Filters unable to differentiate between informational vs harmful content Blocking entire topics or domains due to a single keyword Misinterpretation of regional or cultural content Consequences of Keyword Overblocking and Underblocking: What Advertisers Miss Many advertisers feel that keyword-based filters are enough to prevent their ads from unsafe placements. This has been their go-to strategy for brand safety. However, this approach leaves huge gaps in the process of brand safety and protection. Keyword systems only catch what they are explicitly asked for, leading to overblocking or underblocking of ad placements in many scenarios. For example, a family-focused FMCG brand’s ad may appear beside a YouTube video with explicit visuals, even though the video title contains harmless keywords. Without visual and sentiment analysis, the placement slips through keyword filters, allowing the ad to run beside inappropriate content that damages brand perception. This is an example of underblocking and here are the consequences underblocking of ad placements leads to: Brand Safety Concerns When ads appear next to harmful or controversial content, consumers may directly associate the brand with negativity. A single unsafe ad placement can trigger brand reputation risks and backlash across social platforms. Exposure to Fraud or Low-Quality Traffic Underblocking often means ads might show up on low-quality MFA websites or spam pages, leading to inflated impressions and wasted spending. Poor Conversion Efficiency Ads may appear in irrelevant or unsafe environments, where users are less likely to engage or convert—driving up CPA and reducing return on ad spend. Compliance & Suitability Failures Regulated industries like BFSI, healthcare, or kids’ categories face stricter content rules. Underblocking increases the risk of ads appearing in restricted categories. Let’s take an example of overblocking. This approach cuts advertisers off from massive amounts of safe, high-quality content. An article with a headline like “Virat Kohli’s cover drive continues to kill it this season” triggers the word ‘kill’ (in the keyword blocklist) even though the tone is celebratory and the content is 100% safe. Yet sports advertisers lose access to one of the most engaged audiences in India. Here are the consequences overblocking of ad placements leads to: Loss of High-Quality Inventory High-quality audiences and impressions on safe and suitable pages are blocked due to overly broad filters, shrinking available inventory. Limited Reach & High Media Costs Campaigns struggle to meet delivery goals because a large number of potential placements are unnecessarily excluded. When inventory is restricted, competition increases. CPMs, CPCs, and CPA all rise, impacting efficiency. Missed Opportunities During festivals, sports events, elections, or national news moments, content volumes surge. Overblocking prevents advertisers from leveraging these high-engagement opportunities. How Advertisers Can Avoid Overblocking and Underblocking of Ad Placements To avoid underblocking and overblocking, advertisers need to leverage advanced brand safety solutions to evaluate each ad placement not just by keywords but by what the content means, what message it communicates, its sentiment, and how it is interpreted in a regional context. Analyse Placements Based on Content Understanding the actual subject of a page (and just matching keywords) helps ensure ads appear in relevant, safe environments. Content-level analysis prevents brands from unintentionally blocking large volumes of safe inventory simply because they contain a certain word, phrase, or product reference. This safeguards scale without compromising suitability. Analyse Placements Based on Context Context determines whether a keyword appears in an informative, neutral, or harmful environment. Contextual targeting helps advertisers distinguish between high-quality content and genuinely unsafe pages. This prevents underblocking on risky pages and overblocking on harmless ones, improving both brand safety and delivery efficiency. Analyse Sentiment to Understand Tone of the Content Sentiment analysis evaluates whether the content is positive, neutral, or negative. Even if the topic is safe, negative sentiment can misalign with brand values. Sentiment filters help advertisers avoid negative associations while still accessing neutral or positive content that offers high engagement potential. Analyse Regional Nuances of the Ad Placements In diverse countries like India, regional content often includes multilingual terms, cultural references, slang, and context-specific meanings. Generic filters miss these nuances, leading to misclassification and misalignment of content. Brand safety solutions with regional intelligence filters help advertisers stay safe across diverse markets while maintaining access to
Brand Safety: How Advertisers Can Avoid Underblocking and Overblocking Ad Placements Read More »









