IMAGE CHECK
Check image formats, the 8 MB per-image limit, 1 GB batch size and duplicate filenames before bulk upload.
🔒 Checks run entirely in your browser.
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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 formats, the 8 MB per-image limit, 1 GB batch size and duplicate filenames before bulk upload.
It does not judge image content or product eligibility. Confirm current upload requirements with the service.
Mercari Shops bulk image upload supports jpg/jpeg/png, up to 8 MB per image, up to 1 GB in one upload, and a retained-image limit of 10,000 items.
This tool checks those browser-verifiable limits together before the files ever reach the service.
When you upload local image files first, the product CSV refers to them by filename in the product-image-name fields. Two selected files with the same name make that mapping hard to reason about.
The checker therefore treats case-insensitive duplicate filenames as errors before upload.
A successful image upload does not by itself attach those images to products. The CSV must later reference the uploaded filename, or it can use a linked image URL instead.
Keeping the file-upload step separate from the product-CSV step makes failures easier to locate.
After the files pass this check, run the Mercari Shops image name / URL checker on the CSV. Mercari Shops supports product image fields through image 20, so checking file limits and CSV references separately is useful.