Is it big enough?
We measure DPI and pixel size against the sticker dimensions you pick. Most marketplaces quietly downgrade or reject anything under 150 DPI at the printed size — we tell you the number in plain English, not after the order ships.
Will my sticker file print clean?
Drop your artwork. We answer in two seconds. Nothing uploads, nothing tracked, no account.
↓
Scan Mode
What we actually look at
Print-on-demand sites reject thousands of files a day for boring, fixable reasons. The free uploaders rarely tell you why. Here is what we check before you waste a paid order.
Will the edges be clean?
PNG transparency, alpha quality, fringe pixels, embedded color profile, and preferred color space. The difference between a crisp die-cut and a grey halo around your sticker comes down to two or three flags we check automatically.
Will the cut line work?
For die-cut stickers with an SVG cutline: closure, stroke policy, self-intersection. The kind of issue that wastes an afternoon of back-and-forth with support when the file fails their preflight on their end.
Want a one-page PDF of every scan?
We are shipping a one-click "save as PDF" report next. Drop your email and we will tell you when it is live — nothing else, ever.
Thanks — you will hear from us when it is live. Nothing else.
One email, when the PDF tool launches. No drip campaign, no third-party sharing, no tracking pixels.
Free print-on-demand artwork preflight
Helqora is a free, browser-based file checker for sticker, decal, and label artwork. It runs the same kind of technical checks that a reputable print shop runs at upload time — effective DPI, pixel dimensions, aspect-ratio fit, transparency, alpha quality, embedded color profile presence, color-space hints, and SVG cutline geometry — and reports whether your file is ready before you upload it to a paid order.
If you sell stickers on Sticker Mule, Printful, Redbubble, Etsy, StickerYou, or anywhere else that prints physical goods from a digital file, the technical requirements are broadly the same: 300 DPI at the printed size, clean transparency, a sensible color profile, and (for die-cut stickers) a closed, non-self- intersecting cutline. We check all of those locally.
Your file never leaves your device. There is no upload, no account, no tracking of the artwork itself. The scanner is compiled from a C++ engine to WebAssembly and runs entirely inside your browser tab.