YouTube Thumbnail Previewer
Upload your thumbnail and title to see exactly how they'll look across YouTube — search results, the suggested sidebar and the mobile grid.
'/%3E%3Ctext x='320' y='185' font-family='sans-serif' font-size='28' fill='white' text-anchor='middle'%3EUpload a thumbnail%3C/text%3E%3C/svg%3E)
Drop in your thumbnail and see how it reads at the actual sizes YouTube uses — home feed, sidebar suggestions, search, and mobile — before you publish. Creators reach for it when a thumbnail looks sharp at full size but the text turns to mush or the face gets lost once it shrinks to a 168px box on someone's phone.
How to use the Thumbnail Previewer
- 1. Upload your thumbnail image (1280x720, 16:9 works best)
- 2. Add the video title so you can judge the title-plus-thumbnail combo together
- 3. Scan the previews across home, sidebar, search, and mobile sizes
- 4. Check that the text and main subject still read at the smallest size
- 5. Swap in another version to compare side by side before you upload to YouTube
FAQ
1280x720 pixels at a 16:9 ratio. YouTube recommends a minimum width of 640px and the file must be under 2MB (JPG, PNG, GIF, or BMP). Designing at 1280x720 keeps it crisp everywhere it's displayed.
YouTube almost never shows it at full size. In the home feed it's a few hundred pixels wide, and on mobile or in the sidebar it can drop to roughly 168px. Small text and busy backgrounds that look clear on your editor collapse at those sizes — that's the gap this tool exposes.
Titles get truncated around 60 characters in most feeds, and mobile cuts off even sooner — often after about 40. Front-load the important words and preview the title and thumbnail together, since viewers read them as one unit.
No. It only renders your image at YouTube's display sizes so you can judge it. Nothing is sent to YouTube — you still upload the final file through YouTube Studio yourself.
More channel & utilities tools
All free, instant, no sign-up.