Key Statistics
JPG, PNG, WebP, GIF Formats supported
Lock or custom dimensions Aspect ratio
100% client-side processing Privacy
Resize Images Online - Free Tool
Resize images to any dimension instantly with our free online tool. Upload JPG, PNG, WebP, or GIF images and adjust width and height. Lock aspect ratio for proportional resizing or set custom dimensions. Choose from preset sizes for Instagram, Twitter, YouTube, Facebook, and more. Adjust output quality and format. All processing happens in your browser using Canvas API.📐
Drop an image here or click to browse
Supports JPG, PNG, WebP, GIF
All image processing happens locally in your browser using Canvas API.
Your images never leave your device. No upload to servers.
What is Image Resize?
An image resizer changes the dimensions (width and height) of an image file. This tool uses the browser's Canvas API to resize images with high quality. You can maintain the original aspect ratio for proportional scaling, or unlock it to set custom dimensions for any use case.
Resizing images is essential for web optimization, social media posts, email attachments, and printing. Different platforms have different size requirements - Instagram prefers 1080x1080 for posts, while YouTube thumbnails are 1280x720.
How does Image Resize work?
- 01 Upload an image by dragging and dropping or clicking to browse
- 02 View the original dimensions displayed at the top
- 03 Enter target width and height, or click a preset size (Instagram, Twitter, etc.)
- 04 Toggle aspect ratio lock to maintain proportions or allow custom sizes
- 05 Select output format (JPEG, PNG, or WebP) and adjust quality if applicable
- 06 Click "Preview Resize" to see the result before downloading
- 07 Click "Download Image" to save the resized image to your device
Why use a browser-based tool?
- Maximum privacy: Images are processed locally and never uploaded to any server
- High-quality resize: Uses Canvas API with high imageSmoothingQuality setting
- Works offline: Resize images without internet after page loads
- No file size limits: Process large images limited only by browser memory
- Instant processing: No network latency, results appear immediately
Common Questions
Can I maintain the aspect ratio when resizing?
Yes, by default the aspect ratio lock is enabled. When you change width, height automatically adjusts proportionally. Click the lock icon to unlock and set custom dimensions that don't preserve the original ratio.
What image formats are supported?
Input: JPG, JPEG, PNG, WebP, GIF, and most common image formats. Output: Choose between JPEG (smaller file size), PNG (lossless, supports transparency), or WebP (modern format with excellent compression).
What are the preset sizes for?
Presets provide one-click resizing to common social media and platform dimensions: Instagram Post (1080x1080), Instagram Story (1080x1920), Twitter Post (1200x675), Facebook Cover (820x312), YouTube Thumbnail (1280x720), and LinkedIn Banner (1584x396).
Will resizing reduce image quality?
Resizing down (making images smaller) preserves quality well. Resizing up (enlarging) may reduce sharpness. For JPEG/WebP, adjust the quality slider - 90% is recommended for minimal quality loss. PNG is lossless but creates larger files.
Is there a file size limit?
No hard limit imposed by the tool. Very large images (50MB+) may be slower to process depending on your device. All processing happens in browser memory, so available RAM is the only constraint.
Can I resize multiple images at once?
Currently, this tool processes one image at a time. For batch resizing, process each image individually. Each resize is instant, so multiple images can be processed quickly.