GamutProcessed locally · nothing is uploaded

Crop one image to every size you need

A batch cropping tool for online sellers and content creators. Set up your size templates, drop an image in once, export every format.

Drop your image here
Choose a file
PNG · JPEG · AVIF
  • Entirely in your browser your images never leave this device
  • No sign-up open it and go
  • HDR preserved 10-bit AVIF exported as-is

How it works

  1. Save your sizes once

    Add a template for every size you ship — 1600×1600 for a marketplace listing, 1080×1920 for a story, whatever your channels ask for. Templates stay in your browser between visits, so you set them up once.

  2. Frame each crop

    Drop in one source image. Every template gets its own crop box, locked to that template’s aspect ratio, so nothing comes out stretched. Switch a template to Pad and it scales the whole crop onto a background colour instead of cutting anything off.

  3. Export them all at once

    One click writes every template in the format and quality you chose for it. More than one template comes back as a single zip. Give a template a maximum file size in KB and it will find the highest quality that fits.

Sizes people set up most often

Starting points for the channels sellers and creators publish to. Add them as templates once and every future image goes out at all of them together.

WherePixelsRatio
Amazon main image1600 × 16001:1
Shopify product2048 × 20481:1
Etsy listing2000 × 20001:1
eBay gallery1600 × 16001:1
Instagram feed (portrait)1080 × 13504:5
Instagram Story / Reels1080 × 19209:16
Pinterest pin1000 × 15002:3
YouTube thumbnail1280 × 72016:9

Platforms revise these from time to time — check the current spec before a large upload. Amazon, for example, needs at least 1000 px on the longest side for zoom to switch on, and 1600 px is the usual target.

Questions

Do my images get uploaded anywhere?
No. Decoding, cropping and encoding all run inside your browser tab. The web version has no backend that could store an image even if it wanted to — close the tab and nothing is left behind.
Is there a watermark, a sign-up or an export limit?
None of the three. There is no account to create, nothing is stamped onto your exports, and you can export as many images as you like.
Can I make an export come in under a file size limit?
Yes. Each template takes a maximum file size in KB. On export, Gamut searches for the highest quality that still fits under it, so the quality slider becomes a ceiling rather than a fixed value. If even the lowest usable quality is still over the limit, that template fails and reports the smallest size actually achievable at those dimensions, instead of handing you a file that technically fits but looks broken.
What happens to HDR photos?
If the source is an HDR AVIF and you export to AVIF, the 10-bit data and the colour tags are carried through unchanged. Any other combination — an HDR source exported to JPEG or PNG, or a HEIC container — is tone-mapped to SDR by the browser, and the interface says so before you export.
Which file formats can I open?
PNG, JPEG and AVIF in every browser. Safari can additionally open HEIC, TIFF and JPEG XL, because input support is whatever the browser itself can decode. Exports are always PNG, JPEG or AVIF.
Does it work on a phone?
Yes, though very large images can run a phone out of memory while decoding — a 60 megapixel photo needs several hundred megabytes. If that happens you get an error rather than a silently broken export.