Image Resizer
Resize images to specific dimensions or scale by percentage.
Resize images precisely, in your browser
Whether you need a 1024px profile photo, a 300×250 ad banner, or a 50% thumbnail, this resizer handles it locally in your browser — no upload, no account, no watermark.
Two modes
- Exact pixels — set a target width and/or height in pixels. With “Keep aspect ratio” on, you can leave one blank and the other is computed automatically.
- Percentage — scale the image to 10%–200% of its current size. Useful for quick downscaling without measuring.
Common image sizes to target
| Use | Common dimensions |
|---|---|
| Twitter header | 1500 × 500 |
| Open Graph image | 1200 × 630 |
| Instagram square | 1080 × 1080 |
| YouTube thumbnail | 1280 × 720 |
| Favicon | 32 × 32 |
| iOS app icon | 1024 × 1024 |
How the resampling works
The tool draws the source image onto an HTML5 canvas at the target size with high-quality image smoothing enabled. The browser’s native resampler is used — it produces results indistinguishable from a local image editor for typical downscales.
Privacy
All reads, resizes and downloads happen in your browser. No image data leaves your device.
Frequently asked questions
- Does resizing reduce quality?
- Downscaling (making smaller) loses detail but typically looks fine at the new size. Upscaling (making larger) has nothing to work with — it invents pixels that were not there, producing blurry or pixelated output. For better upscaling, use an AI tool instead.
- What happens if I disable "Keep aspect ratio"?
- The image is stretched to fit exactly the width and height you specify. This produces distorted output unless you are intentionally compressing a known-aspect image into a container that matches.
- Why does the file size go down more than expected?
- Smaller pixel dimensions compress better on disk. A 50% width reduction often cuts file size by 70%+ because JPEG and WebP exploit spatial similarity, which grows at larger sizes.