Resize images by pixels, percentage, or physical units.
Free & unlimited "” all processing happens privately in your browser.
Or click the button below to browse files from your computer.
Resize Image is a free browser-based tool that changes the pixel dimensions of JPG, JPEG, PNG, WebP, GIF, and BMP images. It runs entirely in your browser, keeping your files completely private. You can specify exact pixel dimensions, a percentage of the original size, or physical measurements in inches or centimetres. The tool supports aspect ratio locking so proportions stay correct when you change only one dimension. This is useful for preparing images for specific platforms, printing at a defined size, or reducing file weight by lowering resolution. The result is saved in JPG, PNG, and WebP format and is ready to download immediately after processing.
Upload your image
Select a JPG, JPEG, PNG, WebP, GIF, and BMP file from your device.
Set new dimensions
Enter width and height in pixels, or choose a percentage or physical unit.
Lock aspect ratio
Toggle aspect ratio lock to keep proportions when changing one dimension.
Download
Get your resized image in JPG, PNG, and WebP format.
Input Formats
Output Formats
Social media profiles
Resize photos to exact platform requirements for profile pictures and cover images.
Print preparation
Set dimensions in inches or CM for accurate print layouts.
Thumbnail generation
Create consistent thumbnail sizes for blogs, videos, and product listings.
Email images
Reduce image dimensions to keep email file sizes manageable.
App and UI assets
Generate exact-pixel assets for iOS, Android, and web interfaces.
Batch standardisation
Resize a collection of photos to a uniform size for galleries or presentations.
Downscale for sharpness
Reducing size always preserves more sharpness than enlarging. Capture at a higher resolution when possible.
Use percentage for proportional results
Percentage resize keeps exact proportions without needing to calculate the second dimension.
Avoid repeated resizing
Each resize-and-save cycle can degrade quality. Start from the original file each time.
Check DPI for print
For print, 300 DPI is standard. Use the inch/CM mode to set a size that translates correctly.
Everything you need to know about processing files with this tool.
When scaling up, some quality loss is unavoidable. We use Lanczos3 resampling for the sharpest results. Scaling down generally maintains excellent quality.
Enable the "Lock Aspect Ratio" toggle. Changing width will automatically update the height and vice versa.
You can resize by pixels, percentage, width-only, height-only, inches, centimeters, or millimeters.
Some quality loss is unavoidable when enlarging. The tool uses high-quality resampling to minimise it.
Output can be up to 16,000 × 16,000 pixels.
Common questions from people using this type of tool.
Resize Image on PXEL is a fast, free option that runs entirely in your browser. No software installation or account is required.
Yes. Resize Image runs directly in your web browser using the Canvas API and WebAssembly. Nothing needs to be installed.
Yes. The tool runs in mobile browsers on iOS and Android without any app download.
Yes. There are no hidden fees, no daily limits, and no account required. Every tool on PXEL is free to use.
Resize Image outputs files in JPG, PNG, and WebP format. You can select the format in the tool options.
Processing is nearly instant for most files. Very large files (50 MB) may take a few seconds depending on your device.
Files never leave your browser
All processing uses the Canvas API and WebAssembly locally. Nothing is uploaded.
Instant processing
No server round-trips. Results are ready the moment processing finishes.
Works on all devices
Desktop, tablet, and mobile browsers are all supported. No app required.
Free forever, no limits
No account, no subscription, no daily caps. Every tool on PXEL is free.
No uploads
Your files are processed in memory. They are never stored, logged, or shared.
Last updated: 2025-06
Tool and content kept current to reflect best practices.