Etsy image URLs include size tokens such as il_2000xN or il_4000xN. Experiments in this project’s calibration notes show a dangerous pattern: requesting il_2000xN often returns an image whose edge is 2000px even when the uploaded master was smaller, because the CDN scales to the requested bucket.
That means you cannot prove hover-zoom compliance by swapping URL tokens in the address bar. You might think you “passed 2000px” while Etsy still stores a sub-2000 master and keeps zoom disabled on the listing page.
Worse, il_4000xN can upscale beyond the true master, hiding softness until a buyer zooms. Always measure il_fullxfull when inspecting live listings, or measure the file on disk before upload.
TagPeek’s extension resolves toward full-size URLs where Etsy exposes them, and the free website tool reads local bytes directly — no CDN guessing.
Pair this rule with Rule 06 (794px embed trap) and Rule 01 (actual 2000px floor).
We document these findings so sellers stop relying on forum scripts that only rewrite URL sizes without reading bytes.
If you maintain a spreadsheet of listing URLs, store the measured il_fullxfull dimensions next to each row — not the token in the path — so your team does not regress after the next CDN change.
il_2000xN 常返回 2000 边，不代表原图够大。
il_4000xN 可能放大超过原图，掩盖模糊。
用 il_fullxfull 或本地文件测量，TagPeek 扩展尽量读 full URL。
Source:出处： Size-inference experiments in this project’s calibration notes. 本项目尺寸推导实验（校准节）