An image in the wrong format gets cropped however the app sees fit, and often recompressed until it turns blurry. Good news: you don't need to memorize hundreds of pixel values, just a few stable ratios and a good export habit.
Every platform displays your images inside a fixed frame. If your visual isn't the right ratio, the app crops it on its own: a cut-off face, a vanishing logo, truncated text. You lose control over what your audience actually sees.
Second trap: file weight. An oversized image gets aggressively recompressed on upload. The right format at the right weight is what separates a crisp grid from a blurry one.
Remember the ratios, not the exact pixel counts (which change): square (1:1) and portrait (4:5) for a post, full-screen vertical (9:16) for a story or reel, horizontal (16:9) for a YouTube thumbnail. Always aim for the largest size at the right ratio, the app will scale down if needed.
Pixel values shift over time: check the platform's own help center when you want today's exact number. The ratio itself stays stable.
Resize your image to the right format BEFORE publishing, then compress it to lighten the file without damaging it. You upload a clean image, the app has less work to do, and the result stays sharp.
For a large image you want to spread across your profile, cut it into even tiles: the grid effect catches the eye without any design skill.
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The 1:1 or 4:5 ratio is what matters. For the precise pixel count, check the source, it changes regularly. Aim big and sharp at the right ratio.
Almost always because they're too heavy or badly sized, so they get recompressed. Resize to the right format, then compress before uploading.
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