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Product feed validator

Validate a CSV or RSS product feed for required fields, GTIN check digits, price formats, availability values, and variant consistency.
Product feed text

This is a field checker, not a full feed review. It reads the pasted text only: links and image URLs are never fetched, so a broken URL slips through unless it is also empty or malformed. The GTIN check is the GS1 mod-10 digit over 8, 12, 13, and 14 digit codes, which catches typos but cannot tell a real assigned GTIN from an invented one that happens to checksum. The RSS side is a tag scanner over item blocks, not a full XML parser, so deeply nested or attribute-heavy markup is read loosely. Google's live feed requirements change; treat the profile as a strong baseline and the Merchant Center diagnostics as the final word.
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Canonical HTML: https://nutter.tools/web/product-feed-validator
Markdown version: https://nutter.tools/web/product-feed-validator.md
Plain-text version: https://nutter.tools/web/product-feed-validator.txt
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