Hey Product Hunt 👋 I kept doing the same thing by hand: one product photo, then crop it to 1600×1600 for the listing, 1080×1350 for the feed, 1080×1920 for a story. Every image, every time. The tools I found either do one size at a time, or want an upload and an account first. Gamut is the version I wanted. You set your sizes up once as templates, drop in a single image, frame each crop, and export all of them in one click as a zip. Templates persist, so the second image takes about ten seconds. Two things I care about more than I probably should: **Nothing is uploaded.** Decoding, cropping and encoding all run in your browser. There is no backend that could store an image even if I wanted it to. Close the tab and nothing is left behind. **HDR survives.** Every browser-based cropper I tried goes through canvas, which quietly flattens a 10-bit HDR photo to 8-bit SDR. Gamut decodes HDR AVIF with wasm, resamples in 16-bit, re-encodes to 10-bit and writes the original colour tags back. Shoot HDR on a phone, crop it, and it's still HDR. Also handy if you sell somewhere with a file size cap: give a template a max in KB and it searches for the highest quality that fits, instead of making you guess at a quality slider. What it doesn't do yet: one source image at a time — the batching is across sizes, not across files — and the HDR path only covers AVIF in → AVIF out. Both are on the list. Free, no account, no watermark. I'd love to know which size templates you'd set up first. That tells me more about what to build next than anything else.

Gamut

One image in, every size out. Nothing leaves your browser.

One image in, every size out. Nothing leaves your browser.