Image resizing changes the width and height of an image in pixels. Unlike cropping (which removes parts of the image), resizing scales the entire image up or down while keeping all the content visible.
When do you need to resize images?
- Uploading profile photos (LinkedIn requires 400×400px, Twitter requires 400×400px)
- Preparing images for blog posts (recommended: 1200×630px for featured images)
- Reducing file size before sending via email
- Fitting images into specific website layouts
- Creating thumbnails for video platforms
Social media image size guide 2025
| Platform | Recommended Size |
|---|---|
| Instagram square | 1080 × 1080px |
| Instagram story | 1080 × 1920px |
| Twitter/X post | 1200 × 675px |
| Facebook cover | 820 × 312px |
| LinkedIn post | 1200 × 627px |
| YouTube thumbnail | 1280 × 720px |
How to resize images for free
- Go to Privatool Image Resizer
- Upload your image (JPG, PNG, WebP, GIF — max 10MB)
- Enter target width and height, or select a social media preset
- Toggle aspect ratio lock to avoid distortion
- Choose output format (JPG, PNG, or WebP)
- Click Download
Your file is processed entirely in your browser using the HTML5 Canvas API. Nothing is uploaded to any server.
Tips for best results
- Always keep aspect ratio lock ON unless you intentionally want to stretch the image
- For web use, export as WebP — same quality, 30% smaller than JPG
- If you need to reduce file size too, run the result through Image Compressor after resizing
- For retina screens, double the target dimensions (e.g. 600×600 for a 300×300 display size)
Resizing vs compressing: what's the difference?
Resizing changes the pixel dimensions. Compressing reduces the file size by encoding pixel data more efficiently. For the smallest possible file, do both: resize to your target dimensions first, then compress.