Image Resizer
Resize images to exact dimensions or social media presets. Supports batch processing.
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Free Online Image Resizer
Resizing an image adjusts its pixel dimensions — the number of horizontal and vertical pixels that make up the image. A 1920×1080 image has just under 2.1 million pixels; resizing it to 960×540 halves both dimensions and reduces the file to about one quarter the area. Most applications and platforms have specific image dimension requirements: Instagram posts must be at least 1080 pixels wide, YouTube thumbnails should be 1280×720, and passport photos have strict size requirements. This tool lets you resize to any dimensions or choose from common social media presets.
Aspect ratio refers to the proportional relationship between width and height. A 1920×1080 image has a 16:9 aspect ratio — the same as most modern screens and TVs. Locking the aspect ratio while resizing prevents distortion: if you change the width, the height adjusts automatically to maintain proportions. Unlocking allows you to stretch or squash the image to any dimensions, which can be useful for specific platform requirements that don't match the original's proportions.
Social Media Image Size Guide
Different platforms and uses have specific optimal dimensions. Instagram posts display best at 1080×1080 (square) or 1080×1350 (portrait). Instagram Stories and Reels use 1080×1920 (9:16 vertical). Facebook cover photos should be 820×312 pixels. YouTube thumbnails are 1280×720 (16:9). LinkedIn banner images work best at 1584×396. For professional uses, passport photos require 600×600 pixels. When in doubt, using the highest quality original and resizing down produces better results than scaling up (which can create blurry images).