Image Resizer

Resizing images is a fundamental task for web publishing, social media, email templates, app development, and print preparation. Whether you need to scale a photograph down to fit a CMS upload limit, prepare a banner to exact platform dimensions, or create assets for a responsive design system, getting the pixel dimensions right is essential. This tool lets you resize JPG, PNG, and WebP images directly on your device, nothing is uploaded to any server, and the result downloads instantly to your device.

How to use

1. Open your image. Drag a file onto the drop zone or click to browse. The original dimensions are shown immediately so you know exactly what you're starting with before any changes are made.
2. Set your target dimensions. Enter a new width and height in pixels, or choose a percentage to scale proportionally. The aspect ratio lock is on by default, changing the width automatically updates the height to keep proportions correct. Unlock it if you need non-proportional stretching.
3. Preview the result. A preview of the resized image loads instantly on your device. Check the new dimensions shown in the output panel before downloading to confirm everything looks correct.
4. Download. Click Download to save the resized image to your device. The output preserves the same format as the input for maximum compatibility.

Tips for best results

• Always scale down, not up. Enlarging a small image adds pixel data the original doesn't have, resulting in a blurry or blocky appearance. Start with the largest version of your image available and resize down to the target dimensions.
• Use percentage mode for proportional scaling. If you need to halve or quarter an image, 50% or 25% is faster than calculating exact pixel values. The result is mathematically precise and fully proportional.
• Check platform requirements first. Social media platforms, app stores, and CMS systems have specific dimension requirements. Use the social media sizes reference to look up the correct dimensions before resizing.
• Resize before compressing. If you also need to compress the image, resize first, a smaller image has fewer pixels to compress, giving better quality at a lower file size.

Why use PixMidas

• 100% private. Resizing uses the browser's Canvas API. No file is ever uploaded, your image stays on your device throughout the entire process.
• Aspect ratio lock. The lock toggle keeps width and height in proportion automatically. Disable it only when you intentionally need to distort or stretch an image to non-proportional dimensions.
• No account needed. Free and instant, open the tool, choose your image, resize, save. No signup, no watermark, no usage limits.

Frequently asked questions

What is the difference between resizing and cropping?

Resizing changes the overall dimensions of an image while keeping all content visible, it's like scaling the entire canvas up or down. Cropping removes portions of the image to change its aspect ratio or focus on a specific area. If you want to remove edges or zoom in on a subject, use the image cropper. If you want the whole image at a different size, use this resizer.

Does resizing reduce image quality?

Scaling down generally produces clean results because multiple source pixels are averaged together to create each output pixel. Scaling up introduces softness or pixelation because the tool must invent pixel values that weren't in the original. For best results, always start from the largest available source image. Professional AI-based upscaling tools produce better results than canvas-based enlargement for cases where you genuinely need to increase dimensions.

What formats are supported?

JPG, PNG, and WebP images are supported as input. The output preserves the original format. If you need to change the format at the same time, use the image converter which supports both format conversion and custom output dimensions in a single step.

What does aspect ratio lock do?

When aspect ratio lock is enabled, changing the width automatically recalculates the height (and vice versa) to keep the image's original proportions. This prevents unintentional distortion. For example, a 1920×1080 image with lock enabled, change the width to 960 and the height updates to 540 automatically. Disable the lock only when you specifically want to change the shape of the image.

Is there a maximum image size?

There's no enforced limit on file size or pixel dimensions. Very large images above 20 megapixels may take a second or two to process due to the amount of pixel data involved, but they complete successfully. The limiting factor is your browser's available memory rather than any server-side restriction.

Can I resize to exact social media dimensions?

Yes. Check the recommended dimensions for each platform using the social media image sizes reference, then enter those exact pixel values in the width and height fields. Common targets include 1200×630 for Open Graph images, 1080×1080 for Instagram posts, 1080×1920 for Stories, and 1500×500 for Twitter headers.