Free Online Image Resizer
FreeResize images to exact pixels, percentage, or social media dimensions. Maintain aspect ratio. No upload, instant preview, free.
What's next
Settings guide
Social media dimensions — 2025 reference:
| Platform | Format | Size | Ratio |
|---|---|---|---|
| Square Post | 1080 × 1080 px | 1:1 | |
| Landscape Post | 1080 × 566 px | 1.91:1 | |
| Story / Reel | 1080 × 1920 px | 9:16 | |
| Profile Photo | 320 × 320 px | 1:1 | |
| YouTube | Thumbnail | 1280 × 720 px | 16:9 |
| YouTube | Channel Art | 2560 × 1440 px | 16:9 |
| Twitter / X | Post Image | 1600 × 900 px | 16:9 |
| Twitter / X | Profile Photo | 400 × 400 px | 1:1 |
| Post Image | 1200 × 628 px | 1.91:1 | |
| Profile Photo | 400 × 400 px | 1:1 | |
| Post Image | 1200 × 630 px | 1.91:1 | |
| Status | 1080 × 1920 px | 9:16 | |
| Web (general) | Hero Image | 1920 × 1080 px | 16:9 |
| Print — A4 at 300dpi | Document | 2480 × 3508 px | — |
Format comparison
Resizing vs compressing: Resizing changes the number of pixels; compressing changes how efficiently those pixels are stored. Both reduce file size, and they compound: a 4000×3000px photo resized to 1080×810px reduces pixel count by 93% before any compression is applied. Always resize first, then compress.
Resizing vs cropping: Resizing keeps all content visible but changes dimensions (may stretch if ratio isn't locked). Cropping removes parts of the image to achieve a specific aspect ratio. For social media, you usually need to crop first, then resize.
How it works
Upload
Drop your image into the resizer — JPEG, PNG, WebP accepted.
Enter dimensions
Set target width, height, or percentage. Aspect ratio locks automatically.
Preview
See the resized image and its new file size before downloading.
Download
Save the resized image to your device.
About this format
Every platform has different dimension requirements, and uploading an image at the wrong size has consequences. YouTube adds black bars to thumbnails that aren't 16:9. Instagram crops portrait photos that aren't 4:5. LinkedIn compresses and reframes images that aren't exactly 1200×628px. Getting dimensions right before you upload prevents the platform from making changes you didn't intend.
This resizer handles the precision work: resize to exact pixel dimensions, to a specific percentage of the original, or by entering the target width and letting the tool calculate the height while maintaining aspect ratio. A dimensions table for all major social platforms is below.
Upload your image, enter target dimensions, and download. Everything runs in your browser.