HTML Validator
Validate and check your HTML code for errors
Choose Input Method
Option 1: Copy-paste your HTML here
Option 2: Upload your HTML file
Click to select a file or drag and drop
Tips for HTML Validation
- Make sure all tags are properly closed
- Nest elements correctly - elements should be closed in the reverse order they were opened
- Element IDs must be unique throughout the document
- Always include required attributes (e.g., alt in img tags)
- Use lowercase attribute names and enclose values in quotes
About HTML Validation
HTML (HyperText Markup Language) is the standard markup language for documents designed to be displayed in a web browser. Validation ensures your HTML is well-formed and follows syntax rules, preventing display errors and improving compatibility across browsers.
Common HTML Validation Errors:
- Unclosed tags or missing end tags
- Improper nesting of elements
- Invalid attributes or attribute values
- Missing required attributes
- Duplicate IDs or invalid characters in IDs