How it works
Three steps, and no account at any point.
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Add your photos
Drag in files or a whole folder. JPEG, PNG, WebP, AVIF, HEIC and TIFF all work. HEIC in particular, since that is what an iPhone actually writes and a lot of tools handle it badly.
Nothing uploads. The files are read from disk by your browser and stay there.
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Pick what you are making
Choose "Amazon listing" or "All of the above" and the sizes, background handling and file naming are set together. You can open any of them and change every value if you want to.
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Press Process
Your computer does the work, using as many processor cores as it can spare. Files are written straight into a folder you choose, or downloaded as a zip.
Anything the software is unsure about: a cutout that may have clipped fine detail, a background that did not reach pure white, is flagged for you to look at rather than quietly shipped.
What it will not do
It is not a photo editor. There is no colour grading, no retouching, no AI invention of backgrounds that were never photographed. It takes photographs you took and makes them meet a specification.
Requirements
A recent version of Chrome, Edge, Firefox or Safari. Writing directly into a folder needs Chrome or Edge; everywhere else you get a zip. More processor cores means faster batches: the work is parallelised across them.