Image Resizer
Resize images with width and height controls while keeping aspect ratio.
Select an image to start.
Original
Resized
What is Image Resizer?
Image Resizer changes the width and height of images directly in your browser. You can lock the aspect ratio so the image is not distorted, or set custom dimensions. The resized image can be downloaded in JPEG, PNG, or WebP format.
How to use
- Click Choose Image and select an image file.
- Enter the desired width or height. Enable Lock aspect ratio to auto-calculate the other dimension.
- Click Resize and download the result.
Notes
- Upscaling (making an image larger than its original size) will reduce sharpness since new pixels are interpolated.
- All resizing is done in your browser using the Canvas API — images are never uploaded.
- For web optimization, combine resizing with the Image Compressor to reduce both dimensions and file size.
FAQ
- What does locking the aspect ratio do?
- When the aspect ratio is locked, changing one dimension automatically scales the other proportionally. This prevents distortion — useful for profile photos, icons, and product images.
- What format should I download?
- Use JPEG for photos, PNG for images with transparency, and WebP for the best balance of size and quality in modern browsers.
- Can I resize animated GIFs?
- No. The Canvas API does not support animated GIFs — only the first frame will be processed and exported as a static image.
Overview
Resize images to exact pixel dimensions in your browser, with optional aspect-ratio lock. Useful for profile photos, thumbnails, and platform-specific image requirements.
How to use
- Select or drop an image file.
- Enter the target width or height; with the aspect ratio locked the other side scales automatically.
- Download the resized image.
Examples
-
Profile photo
Input: A 3000x3000 photo
Output: A 400x400 version that meets an upload limit.
-
OG image
Input: A wide screenshot
Output: A 1200x630 image for social sharing previews.
Notes
- Resizing uses the Canvas API locally; images are never uploaded.
- Keep the aspect ratio locked to avoid distortion in portraits and product photos.
- Animated GIFs are not supported; only the first frame is processed.
FAQ
- Will enlarging a small image improve its quality?
- No. Upscaling cannot add detail and usually looks blurry. Start from the largest original you have.
- What does the aspect-ratio lock do?
- Changing one dimension automatically scales the other proportionally, preventing stretched or squashed results.
- Are my images uploaded?
- No. All resizing happens in your browser via the Canvas API.
Embed this tool
Paste this iframe into any HTML page to embed Image Resizer on your site: