Check your thumbnail size, shape, and file limits.
See the facts in your file and compare them with current YouTube guidance without uploading the image.
Drop one image here, or choose a JPG, PNG, WebP, or GIF.
No account required. Select one image at a time.
Know what is in your thumbnail file.
Choose an image to check its dimensions, shape, type, and size.
HOW TO USE IT
Understand the file before you upload.
These checks describe your file and the published guidance. They cannot predict clicks or judge your creative choices.
Read the YouTube thumbnail size guide- Dimensions
- Aspect ratio
- File type
- File size
QUESTIONS
About the checker.
No. Your image stays in this browser. WThumb does not upload or save it.
One image at a time, as a JPG, PNG, WebP, or GIF file. Drop it on the tool or choose it from your device. No account required.
Studio opens separately and will ask you to select the image again.
Ready for a fresh direction?
Start with a reference you like and make a new thumbnail around your channel.
Make a new thumbnail in WThumbStudio opens separately and will ask you to select the image again.