Image
Resizer
Resize images to any dimension. Lock aspect ratio, use presets, and download instantly. 100% client-side.
Drop an image here or click to upload
PNG, JPG, WebP, GIF, AVIF
How It Works
Upload
Drop or select any image file from your device.
Resize
Set custom dimensions, scale by percentage, or pick a preset.
Download
Preview the result and download your resized image instantly.
Resize images online to exact pixel dimensions or by percentage, with optional aspect ratio lock to prevent distortion. ConverterUp's image resizer is useful for preparing photos for blog posts, e-commerce listings, profile pictures, or printable assets that require a specific size. Drop a PNG, JPG, WebP, or AVIF file, type your target width and height, and download the result in seconds. The resizing runs entirely in your browser, so original photos and any sensitive content never leave your device or get queued on a remote server.
Frequently asked questions
How does aspect ratio lock work?
When the lock icon is active, changing width updates height proportionally and vice versa, preserving the original aspect ratio. Disable it when you intentionally want to stretch or squash the image to non-proportional dimensions.
What is the maximum image size I can resize?
Up to 50 MB per file. Very high-resolution images (above 8000 pixels on either side) may be slow on low-end mobile devices because resampling runs on the CPU.
Will my image lose quality when resized?
Downscaling is lossy by nature, but ConverterUp uses high-quality bicubic resampling to keep the result sharp. Upscaling cannot add detail that isn't there, so increase dimensions only when strictly needed.
Which formats are supported?
Input and output formats include PNG, JPG/JPEG, WebP, and AVIF. The output format defaults to the input format but can be changed to convert and resize in a single step.