PREFLIGHT CHECK
Check image name and URL columns for spaces, URL syntax, extensions and duplicates before import.
🔒 Analysis runs in your browser. The CSV file itself is not uploaded to BlueprintLab.
| Severity | Row | Column | Issue | Value |
|---|
The tool does not claim to verify live service-side master data, account-specific state, or network reachability that cannot be established reliably in-browser. The service’s own validation remains authoritative.
Check image name and URL columns for spaces, URL syntax, extensions and duplicates before import.
商品名,商品画像名 サンプルA,https://example.com/a.jpg
If images were uploaded to Mercari Shops first, the CSV can refer to a filename such as `sample.jpg`. If a directly linked image URL is available, that URL can also be entered in the product image field.
The checker therefore validates URL-like values as URLs and other values as expected jpg/jpeg/png filenames.
Mercari Shops documents product image fields through `商品画像名_20`. Adding more numbered columns does not create an unlimited image list.
The checker now flags more than 20 image columns and explicit headers such as `商品画像名_21`.
A local browser check cannot establish whether the remote URL is public, actually returns an image, or will remain available. Whitespace and malformed URL syntax are errors, while reachability remains a service-side check.
Repeated filenames or URLs can be intentional reuse, so duplicates are warnings rather than automatic failures.
If your CSV references previously uploaded filenames, use the Mercari Shops image upload preflight checker first for format, 8 MB-per-file, 1 GB batch size and duplicate filenames.