Image Tools
Image Resizer
Change image dimensions while keeping quality.
Enter the values and review the result.
Drop your image here or click to browse
Max 10MB
Calculation assumptions
- *Images are read and resized in your browser using canvas.
- *Target width and height must be between 1 and 10,000 pixels.
- *Resizing may change image quality, especially when enlarging small images.
- *Very large files may be slow or fail depending on device and browser limits.
Upload your image and press Resize Image.
Resized output will appear here.
What this image resizer does
This tool resizes an uploaded image to the width and height you enter. It draws the image to a browser canvas, then creates a downloadable resized file.
Example: resize a 2400 x 1600 photo to 1200 x 800 pixels before uploading it to a website or sending it in a message.
Common mistakes
- Enlarging a small image too much, which can make it look blurry or pixelated.
- Changing width and height separately without considering aspect ratio.
- Using very large images that may exceed browser memory limits.
- Forgetting to review the downloaded image before publishing or sharing it.
Transparency note
Accuracy and limitations
Calzivo tools are built for practical estimates, conversions, and checks. Some tools use standard formulas or simplified assumptions, and results can be affected by input accuracy, rounding, units, local rules, or changing official requirements.
File and image results can vary by file structure, browser support, size, fonts, compression, and format limits. Review downloaded files before using or sharing them, and avoid sensitive files unless you understand how the tool handles them.
How to Use This Tool
Use these steps to enter the right inputs and interpret the result correctly.
Enter the desired width and height for your image.
Upload your image file.
Download the resized version instantly.
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Related Guides
Background reading and explanations related to Image Resizer.
Frequently Asked Questions
Common questions about Image Resizer and how to read the result.
Will I lose quality?
Downsizing usually keeps quality high, but enlarging a small image will result in pixelation.
Does it keep the aspect ratio automatically?
No. Enter width and height carefully. If you change only one side mentally, calculate the matching side to preserve aspect ratio.
What image types can I upload?
The file picker accepts image files supported by your browser, such as JPG, PNG, WebP, or GIF.
Are files processed in the browser?
Yes. This resizer uses FileReader and canvas in your browser for the resize operation.
Can very large images fail?
Yes. Large dimensions or file sizes can be slow or fail depending on browser and device memory.
Does resizing remove image metadata?
Do not rely on this tool for metadata removal. Review the downloaded file if metadata matters.