Build marketplace packs without your catalog leaving the browser.

Choose a folder, apply one typed recipe, enforce the supplied channel presets, and download a real ZIP. Images are decoded, transformed, and encoded sequentially on this device.

Step 02 · Batch queue

Ready for a local batch.

local only

Drop a folder or image files

The browser decodes and transforms files sequentially. Nothing is sent to Bloomcomp or another server.

JPG · PNG · WebP · decodable AVIFup to 500 sourcesno upload

Step 03

Select output packs

Universal recipeRecipeRecipe size · JPG · PNG · WebP · detected AVIF
Recipe ratio · Browser-memory limitedUses the recipe geometry and naming pattern without marketplace claims.ShopifyRecommended start2048 × 2048 px recommended · JPG · PNG · WebP
1:1 square · < 20 MBShopify says 2048 × 2048 usually displays best for square product images.AmazonRecommended start1600² starting point · JPG · PNG
1:1 square · Category rules varyAmazon allows 500–10,000 px on the longest side and prefers images over 1000 px; 1600² is the selected general starting point.EtsyRecommended start2000 px minimum short edge · JPG · PNG
Source ratio · No general cap assertedEtsy recommends listing images at least 2000 px in both width and height.eBayRecommended start1600 × 1600 px · JPG
1:1 square · ≤ 12 MBeBay recommends roughly 1600 × 1600 px with a 500 × 500 px minimum.

These selectable starting points combine the supplied visual export with current general channel guidance. Category and listing rules can differ, so verify policy before publishing.

Official channel guidance reviewed 2026-07-28 · selectable starting points

Export

Sources—

Outputs—

ZIPBuilt after processing

On-device by construction

There is no upload route in this pipeline. Browser APIs read your selected files, Canvas encodes each output sequentially, and zip.js writes entries incrementally into the bounded archive.

Enforced browser guardrails

500 sources32 MB / source512 MB source total2,000 outputs128 MB encoded16.8 MP / output

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On-device workspace