SELLER OPERATIONS LAB
Prepare product photos with fewer unknowns.
Practical image workflows for independent online sellers: frame the product, compare real export sizes, and check platform-specific facts before publishing.
Independent · English · Files stay on your device
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Three image decisions before you publish
Fit vs Fill for Product Photos: Choose the Right Resize Mode
Choose whether to preserve the entire product photo or fill a frame by cropping, based on what the listing image must keep visible.
Checked 2026-09-23Thumbnail checksEtsy Thumbnail Crop Checklist: Keep Product Details in Frame
A practical crop-review sequence for Etsy listing photos: inspect product edges, meaning and the actual thumbnail before publishing.
Checked 2026-09-23File qualityReduce Product Photo File Size: JPG, PNG or WebP?
Choose output dimensions and JPG, PNG or WebP using a repeatable comparison instead of a promised file-size target.
Checked 2026-09-24MARKETPLACE REFERENCE
Platform facts, separated from workflow advice
Etsy Listing Photo Requirements: File Types, Sizes and Upload Fixes
Check Etsy's supported photo types, pixel recommendations, upload-size warnings and thumbnail workflow using directly linked Etsy help sources.
Official sources checked 2026-09-23Shopify referenceShopify Product Image Requirements and Theme Checks
Current Shopify image limits, format guidance and collection-image behavior, with a practical check that accounts for theme crops and this site's tool limits.
Official sources checked 2026-09-24THE LAB
Reproducible tests with visible limits
JPG, PNG or WebP for Product Photos? A Reference Encoder Benchmark
A reproducible reference-encoder comparison of image formats, with a clear record of what varies by encoder and source image.
Rechecked 2026-09-22Framing experimentCrop Geometry: How Much of a Product Image Can a Thumbnail Remove?
Use transparent calculations and controlled frames to see what centered 1:1, 4:3 and 3:4 crops remove from the same source.
Rechecked 2026-09-22Browser experimentBrowser Image Limits: Why a Small Photo File Can Use a Lot of Memory
A reproducible explanation of pixel buffers, browser limits and why local processing still needs conservative batch sizes.
Rechecked 2026-09-22TOOLS WITH A CLEAR JOB
Prepare and compare files locally.
Resize, preview crops, compare formats, rename and export without sending images to a server. The guides explain what to check and why.
TRANSPARENT BY DESIGN
Clear sources. No claimed seller results.
Seller Operations Lab is an independent editorial and software project, not an Etsy or Shopify partner. Platform facts link to their sources; tests disclose their inputs and limits. We do not claim personal sales results or firsthand seller experience.