Image Resizer
Resize images to exact pixel dimensions or by percentage. Lock aspect ratio, choose PNG or JPG output. Free, private, runs in your browser.
Drop an image here or click to browse
Supports JPG, PNG, GIF, WebP, BMP
About this tool
Need to resize an image for a website, social media post, or email attachment? This Image Resizer lets you set exact pixel dimensions or scale by percentage. The aspect ratio lock ensures your images stay proportional.
The Image Resizer is ideal for preparing images for specific platform requirements such as social media profiles, thumbnails, and website banners. E-commerce sellers use the Image Resizer to create uniform product images that meet marketplace dimension guidelines. Web developers resize hero images and backgrounds to match their layout breakpoints precisely. Photographers can create multiple size variants of a single image for responsive web design without leaving the browser.
This Image Resizer uses the HTML5 Canvas API with high-quality bicubic interpolation for smooth scaling results. The aspect ratio lock feature calculates the proportional dimension automatically when you change width or height. Quick resize buttons let you scale images to common percentages like 25%, 50%, 75%, or 150% with a single click. You can choose between JPEG output for photographs and PNG output for graphics that require transparency support.
For best results when resizing images, always start with the highest resolution source file available. Scaling images up beyond their original dimensions will introduce visible blurriness and pixelation artifacts. When preparing images for the web, aim for dimensions that match your CSS layout to avoid unnecessary bandwidth usage. Use JPEG format at 90% quality for photos and PNG format for screenshots, logos, and graphics with text or sharp edges.
All processing happens in your browser using the Canvas API. Your images are never uploaded to any server, keeping your files private and secure.
settingsResize Settings
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Use JPG for photos (smaller file size) and PNG for graphics with transparency. Lock the aspect ratio to prevent distortion.
Frequently Asked Questions
What image formats are supported?
You can upload JPG, PNG, GIF, BMP, and WebP images. The resized output can be downloaded as either PNG (lossless) or JPG (smaller file size).
Does resizing reduce image quality?
Enlarging an image may reduce sharpness since new pixels are interpolated. Shrinking generally preserves quality. For best results, use the aspect ratio lock to avoid distortion.
Is my image uploaded to a server?
No. All resizing happens in your browser using the Canvas API. Your image never leaves your device.