The Complete Image Size Cheat Sheet for Every Platform (2026)
Every platform wants a slightly different size, and getting it wrong crops your face off or...
Read guide1280 by 720 is HD ready and the minimum YouTube accepts for a custom thumbnail. It is the same 16:9 shape as Full HD at half the pixel count, so it stays well under upload size caps. Drop a photo in and it comes out at exactly 1280 by 720, cropped to fit rather than squashed. Nothing is uploaded.
JPG, PNG or WEBP. Output is always 1280 × 720.
We put the same 600 by 600 portrait through this tool at 1280 by 720 and weighed all three outputs. JPG and WEBP at quality 90.
PNG is lossless, which is why it is 11 times heavier than JPG here and 22 times heavier than WEBP. Use PNG only when you need transparency or perfectly crisp text and lines. For a photograph at 1280 by 720, WEBP at quality 90 came out at 43.4 KB and is almost always the right answer.
1280 by 720 reduces to 16:9, a ratio of 1.778 to 1. Most phone photos are 4:3 or 3:4, which is 1.333 to 1, so unless your source already matches 16:9 the shape has to change on the way in.
That is what the Fit control is for. Crop to fill scales your photo until it covers the whole frame and trims the overflow, so nothing is distorted but something is lost. Fit inside scales until the whole photo is visible and pads the gap with a colour, so nothing is lost but bars appear. Stretch forces the photo into the frame and is the only option that distorts faces.
Crop to fill is the default here because a distorted face is much more obvious than a cropped edge, and because most systems asking for a fixed size expect the frame to be filled. Switch to Fit inside when the whole image genuinely has to stay visible, such as a logo or a diagram.
Common places this exact dimension is specified.
| Use | Why this size | Format worth using |
|---|---|---|
| YouTube thumbnails | 1280 by 720 is HD ready and the minimum YouTube accepts for a custom t | WEBP or JPG |
| HD video stills | 1280 by 720 is HD ready and the minimum YouTube accepts for a custom t | WEBP or JPG |
| Blog headers | 1280 by 720 is HD ready and the minimum YouTube accepts for a custom t | WEBP or JPG |
YouTube states 1280 by 720 as the minimum thumbnail width. Going larger is fine, going smaller is rejected.
If your original is smaller than 1280 by 720, this tool will still produce a 1280 by 720 file, but the extra pixels are interpolated rather than real. Enlarging interpolates, it does not add information. If you need a genuinely larger image, start from a larger original or try the image upscaler, which is honest about the same limit.
Crop to fill takes the centre of your photo. If the part that matters is off to one side, crop it deliberately first with the image crop tool, then bring the result here.
This tool fixes the dimensions, not the bytes. To land under a specific limit such as 100 KB, send the result through the image compressor, which searches for the quality that meets your target.
Drop your photo into the box above. The tool is fixed to 1280 by 720, so the output is always exactly that, and it downloads as soon as you click. Nothing is uploaded to a server, the resize happens in your browser.
Not with the default setting. Crop to fill scales your photo until it covers the 1280 by 720 frame and trims whatever hangs over the edge, so proportions are preserved. Only the Stretch option distorts, and it is there because a few systems genuinely want the whole image squeezed in regardless.
It depends entirely on format. Our 600 by 600 test portrait came out at 975.7 KB as PNG, 87.3 KB as JPG at quality 90, and 43.4 KB as WEBP at quality 90. Detailed photographs will be heavier than flat graphics at the same dimensions.
WEBP if the destination accepts it, since it was 50% the size of JPG in our test at the same quality. JPG if you need maximum compatibility. PNG only for transparency or crisp text, because at this size it was 11 times heavier than JPG.
The tool will still output 1280 by 720, but it cannot invent detail that was never captured. Upscaling interpolates between existing pixels, which softens edges. Start from the largest original you have.
No. The file is read by your browser, drawn onto a canvas and encoded there. You can confirm it by opening your network tab while you use the tool, or by disconnecting from the internet and resizing anyway.
Any dimensions you like, with aspect ratio lock.
Open toolResize a whole folder to this size and download a ZIP.
Open toolChoose exactly which part survives the crop.
Open toolHit an exact file size after resizing.
Open toolPNG, JPG, WEBP and AVIF in and out.
Open toolEnlarge a small source before resizing it.
Open toolCircular avatars with a true circle preview.
Open toolCompress many images at once.
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