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 guide600 square sits between the small avatar sizes and the large ones, and turns up as the required size for marketplace listings, email headers and some print-ready thumbnails. Drop a photo in and it comes out at exactly 600 by 600, cropped to fit rather than squashed. Nothing is uploaded.
JPG, PNG or WEBP. Output is always 600 × 600.
We put the same 600 by 600 portrait through this tool at 600 by 600 and weighed all three outputs. JPG and WEBP at quality 90.
PNG is lossless, which is why it is 10 times heavier than JPG here and 15 times heavier than WEBP. Use PNG only when you need transparency or perfectly crisp text and lines. For a photograph at 600 by 600, WEBP at quality 90 came out at 29.4 KB and is almost always the right answer.
600 by 600 is square, and almost no camera shoots square. A photo from a phone is usually 4:3 or 3:4, and a DSLR is 3:2, so something has to give when it becomes a 600 pixel square. Roughly a quarter of the long edge is removed to make it fit.
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 |
|---|---|---|
| Marketplace listings | 600 square sits between the small avatar sizes and the large ones, and | PNG for icons, WEBP for photos |
| Email header images | 600 square sits between the small avatar sizes and the large ones, and | PNG for icons, WEBP for photos |
| Print thumbnails | 600 square sits between the small avatar sizes and the large ones, and | PNG for icons, WEBP for photos |
600 is a good compromise when a platform gives a range rather than a single number.
If your original is smaller than 600 by 600, this tool will still produce a 600 by 600 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 600 by 600, 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 600 by 600 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 438.5 KB as PNG, 45.4 KB as JPG at quality 90, and 29.4 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 65% 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 10 times heavier than JPG.
The tool will still output 600 by 600, 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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