Resize Images Online for Free
Whether you need to resize a photo for your website, shrink an image for email, or scale up a graphic for print, our free image resizer handles it instantly. Set exact pixel dimensions, scale by percentage, or target a specific file size — all without leaving your browser.
How to Resize Image
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Upload your image
Upload PNG, JPG, or WebP images by dragging onto the tool or clicking to browse.
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Set new dimensions
Enter the target width and height in pixels, or set a percentage scale. Enable "Lock aspect ratio" to prevent distortion.
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Download resized image
Preview the resized result and download it. Batch operations download as a ZIP.
Features
- Resize by exact pixels (width × height)
- Scale by percentage (50%, 75%, 200%, etc.)
- Lock aspect ratio to prevent stretching
- Choose resampling algorithm (Lanczos, Bilinear, Nearest)
- Supports PNG, JPG, and WebP input
- Batch resize up to 20 images
Common Image Resize Use Cases
Resizing images is one of the most common image editing tasks. Developers resize images for responsive web design and API requirements. Designers resize for social media specifications. Photographers resize to reduce file sizes for sharing. E-commerce merchants resize product images to consistent dimensions.
Understanding Resampling Algorithms
When resizing an image, the software must calculate new pixel values — this is called resampling. Different algorithms give different results. Lanczos (Sinc) resampling produces the sharpest results and is best for most use cases. Bilinear gives smooth, slightly softer results and is faster. Nearest neighbor is the fastest but produces blocky results, useful only for pixel art.
Supported Formats
This tool accepts PNG, JPG/JPEG, WEBP files up to 20 MB per file. Process up to 20 images per batch.
Frequently Asked Questions
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Yes — enable the "Lock aspect ratio" toggle. When you change the width, the height updates automatically to maintain the original proportions, and vice versa.
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Enlarging (upscaling) an image beyond its original resolution will reduce sharpness, as the software must "invent" new pixels. AI-based upscaling can improve results for enlargement, but our standard tool uses bicubic resampling which gives smooth results for moderate upscaling.
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Common social media image sizes: Facebook posts 1200×630px; Instagram square 1080×1080px; Twitter/X posts 1200×675px; LinkedIn posts 1200×627px; Pinterest 1000×1500px. These change periodically — check the platform's current guidelines.
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Reducing the pixel dimensions of an image always reduces its file size proportionally. Halving the width and height of an image reduces the number of pixels by 75%, resulting in a significantly smaller file.