The recommended YouTube thumbnail size is 1280×720 pixels (16:9), with a minimum width of 640 px, and custom thumbnail files must be under 2 MB. Drop your image above, pick "Fill & crop" or "Fit inside", then click Create thumbnail. You get a 1280×720 JPG that stays under 2 MB, ready to upload in YouTube Studio.
How to use the YouTube Thumbnail Resizer tool
- 1
Add your image
Drop a JPG, PNG, WebP, HEIC or AVIF file onto the drop area, or click to browse. You can add up to 50 images at once if you are preparing thumbnails for several videos.
- 2
Choose how it fits the frame
"Fill & crop" fills the whole 16:9 frame and trims any overflow from the centre. "Fit inside" keeps the entire image visible and pads the empty space with a background colour you choose.
- 3
Click Create thumbnail
Your browser scales the image to exactly 1280×720 pixels and encodes it as a JPG, lowering the quality only if that is needed to stay under 2 MB.
- 4
Download and upload
Save each thumbnail on its own or download the whole batch as one ZIP, then upload it as the custom thumbnail for your video.
What YouTube thumbnail size should you use?
YouTube recommends custom thumbnails of 1280×720 pixels, which is a 16:9 aspect ratio, the same shape as the video player. The minimum width is 640 pixels, and the file itself has to be under 2 MB. Those are the YouTube thumbnail dimensions this tool targets, and they are the only YouTube rules it relies on.
Sticking to 1280×720 matters because the thumbnail is shown in many places at different sizes: search results, the home feed, suggested videos and the player before playback starts. A 16:9 thumbnail fills those slots cleanly. An image with another shape, such as a square photo or a vertical phone screenshot, either gets letterboxed or cropped somewhere you did not plan.
Exports from design apps often miss the target in small ways: 1920×1080 PNG files that weigh 4 MB, 1280×800 canvases left over from an old template, or a phone photo in portrait. The YouTube thumbnail resizer fixes all of these the same way, so every upload has the same shape and an acceptable file size.
Fill & crop or Fit inside: resize image to 1280x720 without stretching
The tool never stretches your picture. When the source is not already 16:9, it has to either trim some of it or add space around it, and you decide which. "Fill & crop" scales the image until it covers the whole 1280×720 frame and trims the overflow equally from both sides, keeping the centre. This is the right choice when your subject sits in the middle and a little lost edge does not matter.
"Fit inside" scales the image until the whole thing fits within the frame and fills the remaining bars with a solid colour. Use it for square artwork, logos, or a design where text runs close to the edges and cropping would cut a word in half. Picking a background colour that matches your design makes the bars look intentional rather than empty.
If you want to choose exactly which part of a wide or tall photo appears, crop it to 16:9 first with the Crop Image tool and its 16:9 preset, then run it through here to land on the exact 1280×720 size and a thumbnail under 2MB.
A resizer, not a thumbnail designer
To make a YouTube thumbnail that gets clicks you still need a design: a strong image, a few big words, maybe a face and some contrast. This tool does not add text, stickers, frames or graphics. It takes an image you have already designed in any editor, or a frame you exported from your video, and makes it the right size and weight for YouTube.
That focus keeps it fast and private. The image is read, scaled and encoded inside your browser tab and is never uploaded to Krawly's servers, which is useful when the thumbnail reveals a video that has not been published yet. There is no account, no watermark on your thumbnail and no limit on how many you make.
Tips for the best results
- Design at 16:9 from the start (1280×720 or 1920×1080) so neither mode has to crop or pad your layout.
- Keep important text and faces away from the edges; in "Fill & crop" mode the sides are the first part to be trimmed.
- Check the result at a small size before uploading — thumbnails are often seen far smaller than 1280×720.
- Need the same layout for a series? Add all the images in one batch and download a single ZIP.
- Keep your original design file; the JPG is a final export and is not meant to be edited and re-saved repeatedly.
Frequently asked questions
What is the correct YouTube thumbnail size?
YouTube recommends 1280×720 pixels with a 16:9 aspect ratio, a minimum width of 640 pixels, and a file under 2 MB for custom thumbnails. This tool always outputs exactly 1280×720 as a JPG under 2 MB, so the file meets those recommendations.
How does the tool keep the thumbnail under 2 MB?
It encodes the JPG at quality 92 first. If that file would be 2 MB or more, it steps the quality down only as far as needed to get under the limit, so you never lose more quality than the 2 MB cap requires.
Will my image be stretched to 16:9?
No. The image keeps its proportions. With "Fill & crop" it is scaled to cover the frame and the overflow is trimmed from the centre; with "Fit inside" it is scaled to fit and the empty space is filled with a background colour you choose.
Can I add text or graphics to my thumbnail here?
No. This is a resizer, not an editor. Create your design in any design app or photo editor first, including the title text and graphics, then drop the exported image here to get the exact 1280×720 size and a file small enough for YouTube.
Which image formats can I use?
You can add JPG, PNG, WebP, HEIC and AVIF images, up to 50 MB each and up to 50 at a time. HEIC photos from an iPhone work too. The output is always a JPG, which YouTube accepts for custom thumbnails.
Is my thumbnail uploaded anywhere?
No. Resizing and encoding run entirely in your browser with JavaScript, so the image never reaches Krawly's servers and nothing is stored. That keeps thumbnails for unreleased videos private. Closing the tab discards the images and results.
Private by design. Every Krawly converter runs inside your browser using JavaScript and WebAssembly. Your files are not uploaded, stored or seen by anyone — when you close the tab, they are gone.