Image Resizer
Upload an image and resize it to exact pixel dimensions or scale by a percentage. Lock the aspect ratio to prevent distortion. Runs in your browser - nothing uploaded to a server. Free, no signup.
Upload image or drag and drop
JPG, PNG, WebP, GIF
How to use this tool
- 1Click the upload area or drag your image file onto it. Supported formats: JPG, PNG, WebP, GIF.
- 2Choose the resize mode: 'Exact pixels' to set a specific width and height, or 'Percentage' to scale by a fraction of the original size.
- 3In exact-pixel mode, enter the target width or height. Check the 'Lock aspect ratio' box to have the other dimension calculated automatically.
- 4In percentage mode, drag the slider to choose the scale. The resulting pixel size is shown below.
- 5Click 'Resize image', then click 'Download' to save the resized file in the same format as the original.
Example
Upload the photo, choose 'Exact pixels', enable aspect ratio lock, enter 800 in the width field. The height adjusts to maintain the ratio. Click 'Resize image' and download. Output is the same format as the original.
Upload the photo, choose 'Percentage', drag the slider to 50. The original 3000 x 2000 px photo becomes 1500 x 1000 px. Useful for quickly halving file size while keeping the image usable.
Common use cases
- Resizing a large product photo to 1200 x 1200 px for an e-commerce listing
- Shrinking a 4 MB camera photo to under 500 KB before emailing it
- Scaling a hero image to fit a specific website template dimension
- Reducing image dimensions for faster page load times without changing the format
- Preparing a profile photo to the exact pixel dimensions required by a platform
Common mistakes
- Resizing without locking the aspect ratio - entering a width and height that do not match the original ratio stretches or squashes the image.
- Upscaling (increasing dimensions) - making an image larger than its original size does not add detail. It only creates a blurry, pixelated result.
- Expecting large file size reduction from resizing alone - if you need a specific file size (under 500 KB), use the Image Compressor after resizing.
- Not checking the output format - the resized file uses the same format as the original. If you need a different format, use the JPG to PNG or WebP Converter tools.
Frequently asked questions
Will resizing reduce the file size?
Usually yes - fewer pixels means less data. But the reduction depends on the format and content. For more precise file size control, use the Image Compressor after resizing.
Can I resize without distorting the image?
Yes. Enable the 'Lock aspect ratio' checkbox. When locked, entering either the width or height automatically calculates the other to maintain the original proportions.
What formats are supported?
JPG, PNG, WebP, GIF, and most common browser-compatible image formats. The output file uses the same format as the uploaded original.
Is my image uploaded to a server?
No. The resizing happens entirely in your browser using the Canvas API. Your image never leaves your device and is not sent to any server.
Can I make an image larger (upscale)?
Yes, you can enter dimensions larger than the original, but this does not improve quality. Upscaling stretches existing pixels and results in a blurry or pixelated image. For true upscaling with quality preservation, dedicated AI upscaling tools are needed.
What is the maximum image size I can resize?
There is no hard limit, but very large images (above 20-30 MP) may slow down processing depending on your device's memory. Most modern computers handle files up to 10 MB without issue.
What social media image sizes should I use?
Common sizes: Instagram square 1080 x 1080, Instagram story 1080 x 1920, Facebook cover 820 x 312, Twitter/X header 1500 x 500, LinkedIn banner 1584 x 396. Enter these exact dimensions in 'Exact pixels' mode.
Related tools
Last updated