New
Bulk Image Resizer - Resize Multiple Images at Once
Resize dozens of images at once. Set exact dimensions or scale by percentage, choose output format, and download individually or as a ZIP. 100% browser-based, no upload.
Image Tools
Popular
Image Resizer
Resize images online - set exact dimensions or scale by percentage. Free, fast, and private.
Drop an image here
JPG, PNG, WebP, GIF, BMP - or click to browse
What Is an Image Resizer?
An image resizer is a browser-based tool that changes the dimensions of an image - either to exact pixel dimensions or by a percentage scale. Resizing images is essential for web performance, social media uploads, email attachments, and print preparation.
This tool supports JPG, PNG, WebP, GIF, and BMP input formats and can output as PNG, JPG, or WebP. The lock aspect ratio option ensures your image is never distorted. All processing happens in your browser - no upload, no server, 100% private.
Common use cases: resizing images for social media (Twitter, Instagram, LinkedIn), reducing file size for faster website loading, preparing images for email campaigns, and creating thumbnails. Need to resize many images at once? Try our Bulk Image Resizer - it processes entire batches with a progress bar and ZIP download.
Common Image Sizes
| Platform | Recommended Size |
|---|---|
| Twitter / X header | 1500 × 500 px |
| Facebook cover photo | 820 × 312 px |
| Instagram post | 1080 × 1080 px |
| LinkedIn banner | 1584 × 396 px |
| YouTube thumbnail | 1280 × 720 px |
| Open Graph / OG image | 1200 × 630 px |
| Email header | 600 × 200 px |
Frequently Asked Questions
What image formats does this resizer support?
The image resizer supports JPG/JPEG, PNG, WebP, GIF, and BMP files - any format your browser can display.
Will resizing reduce image quality?
Enlarging an image beyond its original size will reduce sharpness. Reducing size generally maintains good quality. For best results when downsizing, use the "Lanczos" or high-quality resampling option.
Can I maintain the aspect ratio when resizing?
Yes. The "Lock aspect ratio" option is enabled by default. When you change width, height updates automatically to keep the original proportions.
Is there a file size limit?
There is no strict file size limit since processing happens in your browser. Very large images (over 20MP) may be slow depending on your device.
What output format will the resized image be?
You can choose the output format: PNG (lossless), JPG (smaller file size), or WebP (best compression). The default matches your input format.
Are my images uploaded to a server?
No. Everything runs in your browser using the HTML5 Canvas API. Your images never leave your device.
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