YouTube's help page gives the YouTube thumbnail size as 16:9, at least 640 pixels wide, with 3840 × 2160 pixels recommended, in a file of up to 2 MB from a phone or 50 MB from a computer. This preset makes 1280 × 720: the same 16:9 shape, well above the minimum, in a much smaller file. A thumbnail is the picture people see before they press play, while the photo or design you start from may be any shape at all.
This page opens Resize image on the YouTube thumbnail tile. You choose whether the picture fills the frame, with its edges cropped, or sits whole on a background colour. For YouTube's full 3840 × 2160, pick Pixels under Resize by, switch off Keep the proportions and type both sides. Below you will find how to resize an image for a YouTube thumbnail, what happens to photos of other shapes, and where to get a still from your own video.
How to resize an image for a YouTube thumbnail
- Press Select images, or drop your picture onto the page.
- Under Size, YouTube thumbnail is already picked. It makes 1280 × 720.
- If your picture is not 16:9, choose Fill, Fit or Stretch under When the shape is different.
- With Fit, pick a Background colour for the bands.
- Keep Save as on Original, or pick JPG, PNG or WebP, then press Resize.
- Save the picture. Its name ends in _1280x720.
A picture that is already 16:9, such as a 1920 by 1080 screenshot of a video or a slide, simply becomes smaller: no shape choice appears, because nothing needs to be cut or added. The From and To lines in the panel show the change.
YouTube thumbnail dimensions are a shape and a minimum rather than one exact number: 16:9, and at least 640 pixels wide. The 1280 × 720 this preset makes meets both. YouTube reviews its requirements from time to time; the help page we checked, and the day, are listed under this article.
Fitting photos of other shapes into 16:9
Fill keeps the middle of the picture and cuts what does not fit. How much that is depends on the shape you start with.
| Your picture | With Fill | With Fit |
|---|---|---|
| Already 16:9 | Nothing is cut | No bands |
| Landscape photo, 4:3 | About the middle 75 % of the height is kept | Narrow bands at the left and right |
| Square, 1:1 | About the middle 56 % of the height is kept | Wide bands at the sides |
| Upright phone photo, 3:4 | About the middle 42 % of the height is kept | The picture as a tall strip in the middle |
For landscape photos, Fill usually looks best and loses only a little at the top and bottom. For a square logo or an upright photo, Fit keeps everything, and the side bands become part of the design. Stretch pulls the picture into shape, which distorts faces, so it is rarely the right choice for a thumbnail.
Choosing a background for Fit
With Fit, the bands take the Background colour: White, Ink, Black or Grey, or any colour you like from the + swatch. A colour from your channel's look ties a set of thumbnails together, and a dark band behind a bright logo makes it stand out.
Transparent is offered too, but it is saved as PNG or WebP, and a thumbnail is normally shown on its own, so a solid colour is the safer choice here.
Make the thumbnail from your own video
Often the best custom video thumbnail is a frame of the video itself. The video tools can save one for you: Video to images saves the frame at the playhead as a PNG or JPG, also in your browser, so you move to the moment you want and press Save frames. A frame from a 16:9 video is already the right shape, so resizing it here only makes it 1280 by 720.
- Pick a frame where faces are sharp and eyes are open; motion blur looks worse when the picture is small.
- Leave room for words if you plan to add a title, and keep them away from the corners.
- Write on it afterwards with Add text to image, using large letters with strong contrast.
- Look at the result at a small size before you use it. A thumbnail is often seen no bigger than a stamp.
Sharing the same artwork on Instagram too? The Instagram grid maker cuts one picture into a 3 × 3 grid of nine tiles, numbered 01 to 09 in reading order.
Format and file size
Save as Original keeps the picture's format: a JPG stays a JPG, a PNG stays a PNG, and an iPhone HEIC photo becomes a JPG. JPG suits photos and keeps the file small. PNG keeps every pixel exactly, which suits sharp text and flat colours but makes a bigger file.
The YouTube thumbnail size has a file part too: up to 2 MB when you upload from a phone. Resizing a large photo down to 1280 by 720 already makes the file much smaller, so this is rarely a problem. If a site sets a tighter limit, resize here first and then use Compress image to reach the number.
A small picture made bigger looks softer, because no new detail can be added. If your picture is smaller than 1280 × 720, the panel warns: Making a picture bigger than it is makes it softer. Start from the largest copy you have.
Thumbnails for a whole channel, privately
Select up to 100 pictures to make thumbnails in one run. Every picture comes out at 1280 × 720 with the same Fill, Fit or Stretch choice and background, the button counts them (Resize 12 pictures), and Save all as ZIP saves them together.
Each file keeps its original name with _1280x720 on the end, so it is easy to match a thumbnail with its video. If one picture in the set needs a different choice, press New picture on the done screen, open that one on its own and run it again with the setting it needs.
- Your pictures are resized in your browser. They are never uploaded, and our server does no picture work.
- It is free, with no account and no watermark. Image tools are not counted in the daily limit, which applies to document conversions only.
- Each saved picture is drawn fresh, with no location, camera or date details.
- It works in current Chrome, Edge and Firefox.
Make your thumbnail now
To resize an image for a YouTube thumbnail, keep the YouTube thumbnail tile for 1280 × 720, choose Fill for a full frame or Fit to keep the whole picture, and press Resize. Crop to 16:9 first when you want to pick the band.
It is free and private. Select your picture above to start.
Source: YouTube Help: Add custom thumbnails on YouTube, checked 22 October 2026.
