What does YouTube Thumbnail Preview do?
See how your own thumbnail and text may appear at several common video-card sizes before publishing. Add a local image and manually enter a title, channel, duration and optional view label. Switch between illustrative desktop search, feed, sidebar and mobile mock layouts. These are Tubelexity approximations, not live YouTube pages or official previews.
How to use YouTube Thumbnail Preview
- 1Choose a JPG, PNG or WebP thumbnail.
- 2Enter your proposed video title and channel name.
- 3Switch through desktop and mobile mock layouts.
- 4Check crop, text wrapping, image resolution and aspect warnings.
Supported inputs and outputs
Inputs
JPG, PNG, WebP, Manually entered text
Outputs
On-page illustrative previews
Practical uses
- Checking text readability at small sizes
- Comparing desktop and mobile crops
- Testing title wrapping before upload
Browser and media limitations
- YouTube can change its layouts and truncation by device or context.
- This is not an official or live YouTube preview.
- Text density and safe placement require human visual judgment.
How local processing works
Work stays in this browser tab. Your files are not uploaded to Tubelexity or a processing server. No YouTube API or scraping is used.
Frequently asked questions
Is this an official YouTube preview?
No. It is a Tubelexity mock layout inspired by common video-card proportions.
Does the tool fetch my YouTube video?
No. You provide the image and text manually.
Why can my title wrap differently on YouTube?
Fonts, viewport width, language and YouTube layout changes affect wrapping.
Will a square thumbnail be cropped?
The preview uses a 16:9 card and warns when the source ratio differs substantially.