How to Resize Images for Web — Perfect Dimensions for Every Platform
Learn the ideal image dimensions for websites, social media, and email. Resize images for Instagram, Facebook, Twitter, LinkedIn, and more.
Using incorrectly sized images on your website or social media can hurt your page speed, user experience, and even SEO rankings. Here's your complete guide to image dimensions for every platform in 2025.
Ideal Image Sizes by Platform
Website Images
**Hero/Banner:** 1920×1080px (full-width)
**Blog post images:** 1200×630px
**Thumbnails:** 400×300px
**Product images:** 1000×1000px (square)
Social Media
**Instagram Post:** 1080×1080px (square) or 1080×1350px (portrait)
**Instagram Story:** 1080×1920px
**Facebook Post:** 1200×630px
**Twitter/X Post:** 1600×900px
**LinkedIn Post:** 1200×627px
**YouTube Thumbnail:** 1280×720px
How to Resize Images with Convert999
Open the **Resize Image** tool
Upload your image (JPG, PNG, WebP, etc.)
Enter your target dimensions or choose a preset
Maintain aspect ratio or crop to exact size
Download your resized image
All processing happens in your browser — no uploads needed.
Image Optimization Tips
Always resize before uploading — don't rely on CSS to scale down
**Use 2x resolution** for Retina displays (e.g., 2400×1260 for a 1200×630 display)
**Convert to WebP** after resizing for 25-35% smaller files
**Compress after resizing** to minimize file size further
Keep originals — resize from the highest quality source
Combine resizing with Convert999's image compression and WebP conversion for the ultimate web optimization workflow.