Image Resizer
Resize images to specific dimensions
This free online image resizer runs in your browser and is part of our Image Tools collection.
Image Resizer
Resize images to specific dimensions or scale by percentage.
Common Sizes:
- Instagram Post: 1080 x 1080 px
- Facebook Cover: 820 x 312 px
- Twitter Header: 1500 x 500 px
- YouTube Thumbnail: 1280 x 720 px
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Instant In-Browser Execution
Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security
Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive
Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever
No subscription fees, no signups, and no software installations.
How to Use the Online Image Resizer
1
Select Image
Upload the image you want to resize from your computer or phone.
2
Specify New Dimensions or Percentage
Enter exact Width and Height in pixels, or use the percentage scaling slider (e.g. 50% scale).
3
Toggle Lock Aspect Ratio
Keep "Maintain Aspect Ratio" checked to prevent image stretching or distortion when entering one dimension.
4
Resize & Download Image
Click "Resize Image" to resample the pixels using high-quality bicubic interpolation and download your resized file.
Frequently Asked Questions
Common questions about using this free online image resizer.
What does "Maintain Aspect Ratio" do? ▾
It locks the proportional relationship between image width and height. When you change the width, the height automatically recalculates so people, logos, and landscapes do not appear stretched or squashed.
Does enlarging an image make it pixelated? ▾
Upscaling a small raster photo (e.g. from 200px to 2000px) will naturally reveal pixelation because raster images contain a fixed number of original sensor pixels. For best results, resize downward or use high-resolution originals.
What resampling algorithm is used? ▾
The tool uses the browser engine's high-quality `imageSmoothingQuality = "high"` bilinear and bicubic interpolation filters for smooth edge transitions.
Can I resize images for specific social media requirements? ▾
Yes. You can enter exact dimensions like 1080x1080 (Instagram square), 1200x630 (Facebook/Twitter preview), or 1920x1080 (YouTube HD thumbnail).
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