Resize Image
Change an image's width and height, with an aspect-ratio lock.
Click to select an image, or drag and drop it here
JPG, PNG, WebP, and other image formats
What Is the Resize Image?
How Is the Resize Image Calculated?
The image is drawn onto a canvas sized to your target width and height, which scales every pixel to fit. When the aspect-ratio lock is on, changing one dimension automatically recalculates the other using the original image's width-to-height ratio, so proportions are preserved.
Resize Image Example
A 1600 × 1200 image resized to a width of 800 with the aspect-ratio lock on automatically sets the height to 600, keeping the same 4:3 ratio.
How to Use the Resize Image
Step 1
Click the upload area or drag and drop an image onto it.
Step 2
Enter a target width and/or height in pixels.
Step 3
Leave "Lock aspect ratio" on to avoid stretching, or turn it off to set both independently.
Step 4
Click Resize & Download to save the result.
Benefits
- Resizes images to an exact pixel size without installing any software.
- Processes everything locally in your browser — images are never uploaded anywhere.
- Aspect-ratio lock prevents accidental stretching or squashing.
Common Resize Image Scenarios
Scenario 1
Shrinking a large photo before attaching it to an email or form.
Scenario 2
Resizing an image to fit a website's or app's required dimensions.
Scenario 3
Preparing a profile picture or thumbnail at a specific size.
Understanding Your Result
The downloaded image has exactly the width and height you entered, in the same file format as the original. Enlarging an image beyond its original size can make it look soft or blurry, since no new detail is created.
Tips
- Keep the aspect-ratio lock on unless you specifically want to stretch the image.
- Shrinking a photo is lossless in terms of proportions; enlarging it much beyond its original size will look blurry.
- Check the displayed original dimensions first so you know what ratio you're working with.
Common Mistakes
- Turning off the aspect-ratio lock and entering mismatched dimensions, which stretches the image.
- Enlarging a small image far beyond its original size and expecting sharp results.
- Entering 0 or a blank value for width or height.
Frequently Asked Questions
Are my images uploaded to a server?
No, all processing happens locally in your browser using the Canvas API — your images never leave your device.
Does resizing reduce file size too?
Usually yes, since fewer pixels generally means a smaller file, but for precise file-size control use the Compress & Convert Image tool.
Can I resize by percentage instead of exact pixels?
Not directly — calculate the target pixel dimensions from your original size and desired percentage (e.g. 50% of 1600×1200 is 800×600) and enter those.
What image formats are supported?
Any image format your browser can display, including JPG, PNG, and WebP — the downloaded file keeps the same format as the original.
What happens if I resize an image larger than its original size?
The image will be upscaled, which can result in a softer or blurrier appearance since new pixels are being generated or interpolated rather than capturing genuinely new detail.
Does resizing preserve the image's original format?
Yes — the resized output keeps the same file format as the input unless the tool also offers a separate format conversion option.
What's the difference between resizing and cropping?
Resizing scales the entire image up or down while keeping all original content, while cropping removes part of the image entirely to keep only a selected region at its original scale.
Why does locking the aspect ratio matter?
Locking the aspect ratio prevents the image from looking stretched or squashed, ensuring width and height scale together proportionally rather than independently.
What's a common pixel size for social media profile pictures?
This varies by platform, but many recommend a square image around 400x400 pixels or larger for profile pictures — check each specific platform's current guidelines for exact requirements.
Important Information
Images are read and resized locally in your browser and are never uploaded to a server.
Last updated: August 1, 2026