Every platform has its own image size rules, and ignoring them costs you quality. Instagram crops your post. LinkedIn stretches your banner. Your email client shows a blurry header.
The fix is always the same: resize the image to the exact pixel dimensions before uploading.
Resize any image to exact dimensions: Image Resizer — Pixels, Aspect Ratio, No Upload
Standard Dimensions by Platform
Social Media
| Platform | Use | Recommended Size |
|---|---|---|
| Square post | 1080 × 1080px | |
| Portrait post | 1080 × 1350px | |
| Story / Reel | 1080 × 1920px | |
| Profile photo | 320 × 320px | |
| Banner / cover | 1584 × 396px | |
| Post image | 1200 × 627px | |
| Profile photo | 400 × 400px | |
| Twitter / X | Header | 1500 × 500px |
| Twitter / X | Post image | 1200 × 675px |
| Cover photo | 851 × 315px | |
| Post image | 1200 × 630px | |
| YouTube | Channel art | 2560 × 1440px |
| YouTube | Thumbnail | 1280 × 720px |
| Use | Recommended Size |
|---|---|
| Email header banner | 600px wide (height varies) |
| Email inline image | 480–600px wide |
| Email signature logo | 200–300px wide |
Email clients display images at 600px wide on desktop. Anything wider gets scaled down, wasting file size and potentially causing layout issues on mobile.
Website and Blog
| Use | Recommended Size |
|---|---|
| Blog cover image | 1200 × 630px |
| Open Graph / OG image | 1200 × 630px |
| Favicon | 32 × 32px, 180 × 180px |
| Hero section background | 1920 × 1080px |
How to Resize to Exact Dimensions
- Go to the Image Resizer
- Upload your image (JPG, PNG, WEBP supported)
- Enter the width and height in pixels from the table above
- Choose whether to lock aspect ratio (prevents stretching) or set both dimensions exactly
- Click Resize and download
The tool runs entirely in your browser — your image is never uploaded to a server.
Aspect Ratio Lock vs Exact Dimensions
Lock aspect ratio keeps the image proportions intact. If you resize a 4000×3000px photo to 1200px wide with ratio locked, it becomes 1200×900px — same proportions, smaller size. Use this for most cases.
Exact dimensions forces the image to fit the specified width and height regardless of original proportions. This can cause stretching if your image's aspect ratio doesn't match the target. Use this only when the platform strictly requires both dimensions (like Instagram's 1080×1080 square, where you'd want to crop first, then resize).
For platforms with strict aspect ratios (Instagram square, LinkedIn banner), crop the image to the right ratio first using the Image Crop tool, then resize to exact pixels.
Retina / High-DPI Displays
Many modern devices have 2× or 3× pixel density screens (Retina on Apple, OLED on Android flagships). For web images displayed on these screens, export at 2× the CSS display size:
- If your image displays at 600px wide, export at 1200px wide
- The browser scales it down, and it appears sharp on retina screens
For social media, the platform handles this — stick to the recommended dimensions.
File Size After Resizing
Smaller pixel dimensions = smaller file size, but not always enough. For web and email, also compress the image after resizing. A 1200×630px PNG can still be 2MB+ without compression — which affects page load speed and email deliverability.
The common workflow: resize → compress → upload.
Related Tools
- Image Crop — crop to aspect ratio before resizing to avoid distortion
- Image Compressor — reduce file size after resizing without visible quality loss
- Image Converter — convert between JPG, PNG, and WEBP after resizing
Resize your image to exact platform dimensions: Image Resizer at Ultimate Tools — free, no upload, instant download.
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