Resize an image to exact dimensions in your browser — no upload.
Processed locally — your image is never uploaded.
How do you resize an image to exact dimensions?
The image is drawn onto a canvas at the new size and re-encoded. With the aspect ratio locked, the missing dimension scales from the original: new height = original height × new width ÷ original width. A 4000 × 3000 photo resized to 800 px wide becomes 800 × 600. Everything runs in your browser, so the photo is never uploaded.
Understanding your result
The image is drawn onto a canvas at the new size and re-encoded. Enlarging beyond the original size will look soft, since pixels are interpolated.
Formula and method
With the aspect ratio locked, the missing dimension is scaled from the original: new height = original height × new width ÷ original width.
Worked example
A 4000 × 3000 photo resized to 800 px wide becomes 800 × 600 with the ratio kept.
How to use this tool
- Choose an image (JPG, PNG or WebP).
- Enter a target width and/or height.
- Keep or stretch the aspect ratio, pick a format and download.
Common mistakes to avoid
- Stretching with the aspect ratio off, which distorts the image.
- Upscaling a small image and expecting extra detail.
About the Image Resizer
Resize any image to the exact dimensions you need and download it. Everything happens in your browser, so your photo is never uploaded.
Who should use this tool
Anyone preparing images for the web, email, avatars or printing who needs a specific size.
Frequently asked questions
Is my image uploaded?
No. Resizing runs entirely in your browser and the image never leaves your device.
Which format should I pick?
Use PNG for graphics and transparency, JPG for photos, and WebP for the smallest size with good quality.