Need to resize a photo for a website, social media, or email? This guide shows how to change image dimensions online in seconds — no Photoshop, no signup.
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Resize Image Free →Resize by Pixels vs. Percentage
Pixel mode: Set exact width and/or height in pixels. Best when you need a specific output size (e.g., 1200×630 for Open Graph images).
Percentage mode: Scale the image relative to its original size (e.g., 50% reduces both dimensions by half). Best when you want to proportionally reduce file size.
Aspect Ratio Lock
Locking the aspect ratio ensures the image doesn't get distorted. When you change width, height adjusts automatically to maintain proportions. Always keep this on unless you intentionally want to stretch or squish the image.
Common Target Sizes
| Use Case | Recommended Size |
|---|---|
| Open Graph / social share | 1200 × 630 px |
| Twitter/X header | 1500 × 500 px |
| YouTube thumbnail | 1280 × 720 px |
| Instagram post | 1080 × 1080 px |
| Web article image | 800–1200 px wide |
Resize vs. Compress
Resizing changes the pixel dimensions. Compressing reduces file size at the same dimensions. For the smallest output, do both: resize to the display size first, then compress. Use the Image Compressor after resizing.