Last updated 28 August 2026
Why one image never fits everywhere
Platforms disagree about aspect ratios in ways that make a single export impossible. A YouTube thumbnail is 16:9, an Instagram post is square or 4:5, a story is 9:16, and a LinkedIn banner is close to 4:1. Uploading the wrong ratio does not usually fail — it gets cropped automatically, and the automatic crop rarely lands where you would have chosen. Doing it deliberately is the difference between a subject centred properly and a subject with their head cut off. The two modes here cover the two situations honestly: crop-to-fill when the image has room to lose at the edges, fit-inside when it does not and a padded border is the lesser evil. Sizes are checked against what each platform currently recommends, but these do shift, so treat them as sensible rather than eternal.
Common questions
Which mode should I use?
Crop-to-fill for photographs with the subject near the centre — it fills the frame with no bars. Fit-inside for logos, screenshots or anything where cropping would lose something important; the gap is filled with your chosen padding colour.
Will resizing make the image blurry?
Enlarging will, because there is no extra detail to invent. Shrinking is safe. If a preset is larger than your original, the result will be soft — start from the largest version of the image you have.
Are the platform sizes up to date?
They match what each platform currently recommends, but these change from time to time without much announcement. If something looks wrong after an upload, check the platform's own guidance.
Is my image uploaded anywhere?
No. Every version is produced on a canvas in your browser and zipped locally. The image never leaves your device.