How do I filter the sitemap CSV by URL pattern?

Filter the CSV in your spreadsheet tool. In Excel/Sheets: select the URL column, Data → Filter, then text-filter on contains '/blog/' or starts-with 'https://example.com/products/'. For larger sets, command-line is faster: grep '/blog/' sitemap.csv writes only matching rows. In Python: df[df['URL'].str.contains('/blog/')]. If you want filtering before conversion (e.g. only blog URLs from a huge sitemap), there's no built-in filter in xmlsitemapmaker.com — convert everything, then filter the CSV. For sitemap-index files where each child is a different content type (which is the common WordPress/Shopify pattern), just point the converter at one child sitemap instead of the index to get pre-filtered output.