Best for XSS prevention
Best HTML Entity Encoder for XSS Prevention (2026)
Cross-site scripting (XSS) is one of the most common web vulnerabilities. Encoding user-supplied content as HTML entities before rendering prevents malicious script injection. The right encoder handles all dangerous characters.
Tool Comparison
HTML Entity Encoder
RecommendedEncodes all HTML-sensitive characters (<, >, &, ", ') to their entity equivalents.
Best for: Testing and verifying HTML encoding logic for user-generated content
Pros
- Encodes all five critical XSS characters
- Decode mode for inspecting encoded content
- Shows both named and numeric entity forms
Cons
- Manual encoding — integrate encoding in your app's output layer for production
Recommended Workflow
-
1
Paste potentially dangerous input (e.g., <script>alert('xss')</script>)
-
2
The encoder converts < > & " ' to safe HTML entities
-
3
Verify the encoded output is safe to embed in HTML
-
4
Use Decode mode to inspect encoded strings from your application
Frequently Asked Questions
Which characters must be HTML-encoded to prevent XSS?
At minimum: < (<), > (>), & (&), " ("), and ' ('). These five characters can be used to break out of HTML contexts and inject scripts.
Is HTML encoding enough to prevent all XSS?
HTML entity encoding prevents XSS in HTML body context. For JavaScript strings, CSS values, and URL attributes, you need context-specific encoding. Always use your framework's built-in escaping.
What's the difference between HTML encoding and URL encoding?
HTML encoding converts characters to HTML entities (e.g., <) for safe display in web pages. URL encoding converts characters to percent-encoded form (e.g., %3C) for safe use in URLs. They serve different purposes.
Related Recommendations
Ready to Try It?
All our tools run entirely in your browser — free, fast, and private.