Onliner · free
I will check a creative for Onliner
I check the file against Onliner — sizes 300 × 600, 320 × 500, 300 × 250, 240 × 400 and 8 more, weight and file type — then the contrast, on-screen legibility and the offer.
1. Platform
Marketplaces
Ad networks
Social and messengers
Classifieds
Portals and services
2. Image
Drop a card or a bannerFor the technical check the file stays on your device
Show me a file — I will check it against Onliner in a second, then check contrast, legibility and the offer.
Onliner requirements
- Sizes: 300 × 600, 320 × 500, 300 × 250, 240 × 400, 2000 × 90, 1000 × 90, 320 × 100, 1200 × 600 and 4 more
- Up to 300 KB, files JPG, PNG, GIF
- ads in Belarus: Belarusian or Russian, no comparison with competitors
- keep text and logo out of: side margins — the platform's interface sits there
What the content check covers
One image — 13 checks at once. On a check’s own page it comes first in the report and is explained in detail.
How I check
- Sizes: 300 × 600, 320 × 500, 300 × 250, 240 × 400, 2000 × 90, 1000 × 90, 320 × 100, 1200 × 600, 1400 × 600, 1000 × 600, 640 × 600, 1280 × 100.
- Weight — up to 300 KB, files JPG, PNG, GIF.
- The platform takes only its own sizes — I check the size pixel for pixel.
- Requirements checked against the official page on 2026-10-21.
Common mistakes
- ads in Belarus: Belarusian or Russian, no comparison with competitors
- keep text and logo out of: side margins — the platform's interface sits there
FAQ
What sizes does Onliner take?
300 × 600, 320 × 500, 300 × 250, 240 × 400, 2000 × 90, 1000 × 90, 320 × 100, 1200 × 600, 1400 × 600, 1000 × 600, 640 × 600, 1280 × 100.
Where does Onliner work?
Belarus.
How do I fix what you find?
Neuro builds every Onliner size from one file and checks each by the same rules. Credits only for an accepted result.