Thumbnail Size Checker
Check if your thumbnail image is the right size, ratio and file size for YouTube. Choose an image file below — it is checked in your browser and never uploaded anywhere.
How to use
- Click Choose file and pick your thumbnail image.
- Click Check Size.
- See the width, height, ratio and file size — and whether it meets YouTube's recommendations.
About this tool
The Thumbnail Size Checker does one job well: Check if your thumbnail image is the right size, ratio and file size for YouTube.. It asks for your choose a thumbnail image. Click “Check Size” when you are ready, and the result appears straight away. No sign-up, no download, no cost: it runs in your browser whenever you need it.
A good thumbnail is often the difference between a video that gets watched and one that gets ignored. That is why the Thumbnail Size Checker is useful right at the end of your editing workflow, when the video is ready and the packaging still needs work. Beginners use it to avoid simple mistakes, and experienced creators use it to check the details quickly before every upload.
It works in a few quick steps. First, click Choose file and pick your thumbnail image. Next, click Check Size. Then, see the width, height, ratio and file size — and whether it meets YouTube's recommendations.
Read the result as a direct answer to the question you asked. It is based only on what you entered, so if the answer surprises you, double-check the input before assuming the tool is wrong. One thing worth knowing: YouTube recommends 1280x720 pixels (16:9 ratio), in JPG, PNG or GIF format, under 2 MB.
- Paste your choose a thumbnail image instead of typing it where you can. It is faster, and it avoids the typos that cause odd results.
- Keep in mind that yes, it is completely free and needs no sign-up.
- Check your thumbnail at phone size too: most viewers see it small, and small text disappears fast.
Frequently asked questions
Is the Thumbnail Size Checker free?
Yes, it is completely free and needs no sign-up. Choose an image file and it is checked right in your browser.
What is the recommended YouTube thumbnail size?
YouTube recommends 1280x720 pixels (16:9 ratio), in JPG, PNG or GIF format, under 2 MB.
Is my image uploaded anywhere?
No. The image is read with your browser's FileReader and never leaves your device.