Resize Image Online

Resize images to exact pixel dimensions using the Canvas API. Maintain aspect ratio or set custom width and height. Runs entirely in your browser — your files never leave your device.

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Accepted formats: JPG, JPEG, PNG, WEBP, BMP, JPEG, PNG, WEBP, BMPMax file size: 20 MB

Your files are processed entirely in your browser. Nothing is uploaded to any server.

About This Tool

The Resize Image tool lets you change the dimensions of any JPG, PNG, WebP, or BMP image to exactly the size you need. Whether you are preparing images for a website, social media post, email signature, or print project, this tool gives you precise control over width and height in pixels. Enable "Maintain Aspect Ratio" to scale proportionally and avoid distortion, or set custom dimensions for a specific crop. Everything runs directly in your browser using the Canvas API, so your images are never uploaded to a server and your privacy is fully protected. Simply drop your file, enter your target dimensions, and download the resized result in seconds.

How to Use

1Click the upload area or drag and drop a single image file (JPG, PNG, WebP, or BMP, up to 20 MB).
2Enter the desired width in pixels. If "Maintain Aspect Ratio" is enabled, the height is calculated automatically.
3To set both width and height independently, uncheck the "Maintain Aspect Ratio" option and enter both values.
4Click "Process" to resize the image using the Canvas API.
5Preview the resized image directly in your browser to verify the result.
6Click "Download" to save the resized image to your device in the same format as the original.

When to Use

•When you need to resize product images or photos to specific dimensions for an e-commerce store or website.
•When preparing images that meet social media platform size requirements (profile pictures, banners, post images).
•When reducing large camera photos to smaller dimensions for faster loading on web pages or email attachments.
•When creating consistently sized thumbnails or gallery images for a portfolio or blog.
•When adjusting an image to fit specific print dimensions such as passport photos or ID card images.
•When resizing screenshots or UI mockups to a standard resolution for documentation or presentations.

Tips & Tricks

✨Keep "Maintain Aspect Ratio" enabled to avoid stretching or squishing your image. The tool will calculate the correct height based on the width you enter.
✨For the best visual quality when downscaling, start with the highest resolution source image available. Scaling down preserves detail better than scaling up.
✨If you need to scale up an image, be aware that enlarging beyond the original dimensions can introduce blurriness. Try to keep the scale factor under 2x for acceptable results.
✨The output format matches the input format automatically. If you upload a JPEG, you get a JPEG back. Upload a PNG for lossless output.
✨For web use, aim for the smallest dimensions that still look sharp on screen. Common web image widths are 800px, 1200px, or 1920px.
✨When resizing for social media, check the platform recommended dimensions first (e.g., 1080x1080 for Instagram posts, 1200x630 for Facebook shares).

Frequently Asked Questions

No. All processing happens entirely in your browser using the HTML5 Canvas API and JavaScript. Your image files never leave your device, ensuring complete privacy and security.

The tool supports JPEG (.jpg, .jpeg), PNG (.png), WebP (.webp), and BMP (.bmp). The output format automatically matches the input format. BMP inputs are exported as PNG since browsers cannot export to BMP natively.

When enabled, the tool scales the image proportionally so that the width-to-height ratio stays the same as the original. You only need to specify the target width; the height is calculated automatically. This prevents the image from appearing stretched or distorted.

Upscaling (making the image larger than the original) will work, but it may introduce blurriness or pixelation because the tool must interpolate new pixel data. For best results, avoid enlarging an image more than 2x its original dimensions.

The maximum file size is 20 MB. Since resizing is handled by your browser, very large images may take a moment to process depending on your device performance and available memory.

Reducing the dimensions of an image will generally decrease its file size, since there are fewer pixels to store. However, the exact file size depends on the output format and the image content. A smaller PNG with complex detail may still be relatively large compared to a larger JPEG with simple colors.

This tool currently supports resizing one image at a time. For batch resizing, process each image individually. Batch support may be added in a future update.

No. Because the image is re-rendered through the Canvas API, EXIF metadata (camera info, GPS coordinates, orientation, etc.) is stripped from the output. This can actually be a privacy benefit if you want to remove location data before sharing an image online.

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