Convert, shrink, rename: one pass

The tool converts every image to JPG, PNG, or WebP. You can set the quality, cap the file size in MB, or limit the longest side, which never upscales. For fixed dimensions it scales the image to fit an exact canvas with a white border. With “Original” as the format, you only rename images without setting a format or size.

For file names, set your own base name, a prefix or suffix, and numbering. A hundred camera files become a series like STRIPES_001 to STRIPES_100. The tool uses no credits.

Which files Amazon accepts

• Amazon accepts JPEG, TIFF, PNG, and non-animated GIF, and recommends JPEG. WebP is not on the list.
• The longest side is between 500 and 10,000 pixels. From 1,000 pixels, zoom becomes available.
• For bulk uploads matched by file name: product identifier, variant code, and extension, separated by periods, for example B000123456.MAIN.jpg or B000123456.PT01.jpg. Spaces and hyphens prevent the upload.
• Alternatively, name files freely and assign them to products after uploading.

Sources: Amazon Seller Central: Unsupported file suffix, accessed September 28, 2026 · Amazon Seller Central: Product image guide (G1881), accessed September 28, 2026 · Amazon Seller Central: Upload images, accessed September 28, 2026

Why WebP files cause trouble

Many stores now serve product images as WebP. If you pull images from your own store or from suppliers, you often end up with a folder of files Amazon rejects on upload. One pass with JPG as the target format fixes all of them at once. If a file carries an AI origin notice, it survives the conversion.

Frequently asked questions