Perfect proportions, every platform.
Lock an aspect ratio and resize without distortion, or grab the exact pixel size for any social platform. Instant ratio math and a live preview — all in your browser.
Set your ratio
Pick a preset like 16:9, or type a width and height and let it work out the ratio.
Resize safely
Lock the ratio, then change one dimension — the other follows so nothing stretches.
Match the platform
Tap a social preset for Instagram, YouTube, TikTok and more, then copy the size.
What is an aspect ratio?
An aspect ratio is the proportional relationship between a width and a height, written as width:height — for example 16:9. It stays the same no matter the pixel size, so 1920×1080 and 1280×720 are both 16:9.
How do I resize an image without distorting it?
Turn on 'Lock ratio', then change either the width or the height — the other value updates automatically to keep the same proportions, so nothing stretches or squishes.
What size should my Instagram / YouTube / TikTok post be?
Use the presets: Instagram square 1080×1080, portrait 1080×1350, story/reel 1080×1920; YouTube thumbnail 1280×720 and video 1920×1080; TikTok 1080×1920. Click one to load its exact dimensions and ratio.
Is this tool free?
Yes — completely free, no sign-up, no limits.
Does anything get uploaded?
No. All the math runs locally in your browser — nothing you enter leaves your device.