Image Resizer & Scaler
Resize images by exact pixel dimensions or percentage scaling. Lock aspect ratio controls, canvas bicubic interpolation, and format conversion.
Choose an Image File or Drag & Drop Here
Supports JPG, PNG, WebP, GIF, and BMP images up to 50MB
How to Resize Images Online
Follow these 3 simple steps to change image dimensions or scale percentage without uploading anything.
Upload Image
Drag and drop your image into the dropzone.
Set Dimensions
Type target pixel width and height or pick a percentage scaling preset.
Download Resized File
Save your resized image instantly in original format, JPG, PNG, or WebP.
Frequently Asked Questions (FAQ)
Is my image resizing private?
Yes. All scaling runs locally inside your web browser using HTML5 Canvas. Your images are never uploaded to any remote server.
How does aspect ratio locking work?
When aspect ratio is locked, entering width automatically calculates matching height (and vice-versa) so your photo never gets distorted.
Can I change the image format while resizing?
Yes. You can choose to keep the original format or export as JPG, PNG, or WebP.
What is the maximum file size limit?
You can resize images up to 50MB per file with unlimited usage.
Choosing Dimensions and Avoiding Blurry Results
Resizing changes the number of pixels in an image, which is different from changing how large it looks on screen. Picking the right pixel size for the job is what keeps the result sharp and the file small.
Matching size to purpose
- Web pages: make the image about as wide as the space it fills. If a layout is sharp on high-density screens, aim for roughly twice the displayed width.
- Email and messaging: a long edge around 1200 to 1600 pixels is usually plenty and keeps attachments light.
- Printing: work backward from the print size. A 4 by 6 inch print at 300 pixels per inch needs about 1200 by 1800 pixels.
Shrinking versus enlarging
Reducing an image throws away detail you did not need, and the result generally looks clean. The 200% preset goes the other way. The browser has to invent pixels between the existing ones, so enlarged photos look soft and no setting restores real detail. Treat enlarging as a last resort and stay near 200% or below.
Aspect ratio and the format menu
Leave Lock Aspect Ratio on unless you deliberately want to stretch the picture. If you need a specific shape, such as a square avatar, resize first and then trim with the image cropper rather than distorting the photo.
The output format affects file size as much as the dimensions do. This page has no quality slider, so JPG and WebP exports use the browser default quality. For a photo, JPG or WebP will be much smaller than PNG. For a logo, a screenshot or anything with transparency, choose PNG or WebP, because JPG fills transparent areas with white.
Tips
- Resize from the original file each time. Scaling down and then back up never recovers the lost detail.
- The downloaded file name includes the new dimensions, which helps you tell versions apart.
- If you also need a smaller file, run the result through the image compressor afterward.