Image Resizer
Resize images to exact dimensions or percentages.
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How to Use Image Resizer
- 1Upload your image by clicking the drop zone or dragging a file onto it.
- 2Choose your resize mode: Custom (exact pixels), Percentage (scale up or down), or Preset (common resolutions like HD, FHD, 4K).
- 3Enter your target dimensions, scale percentage, or select a preset.
- 4Choose a Fit mode: Contain (preserve aspect ratio), Cover (fill and crop), or Stretch (ignore aspect ratio).
- 5Select the output format (JPEG, PNG, WEBP) and quality, then click 'Resize Image' and download.
Frequently Asked Questions
What is the difference between Contain, Cover, and Stretch modes?
Contain scales your image to fit within the specified dimensions while preserving the aspect ratio — there may be empty space around the image. Cover scales and crops the image to exactly fill the specified dimensions. Stretch ignores the aspect ratio and forces the image to exactly match both width and height.
Can I resize an image larger than its original size?
Yes, but enlarging (upscaling) a raster image will reduce its sharpness since no new pixel data is added. Upscaling by more than 2× typically results in a noticeably blurry image.
How does the aspect ratio lock work?
When the lock icon is active, changing the width automatically recalculates the height to maintain the original proportions, and vice versa. This prevents your image from being distorted when resizing to custom dimensions.
What presets are available?
We include presets for HD (1280×720), Full HD (1920×1080), 2K (2560×1440), 4K (3840×2160), common square sizes (512×512, 1024×1024), social media (1200×628), and thumbnails (300×300).
Are there limits on the number of images or file size?
The Image Resizer processes one image at a time, with no file size limit. For batch resizing of multiple images, simply process them one at a time. All processing is done locally in your browser.
About Image Resizer
The Image Resizer is a versatile browser-based tool for changing image dimensions to exact pixel measurements, preset resolutions, or a percentage of the original size. It's useful for a wide range of tasks: preparing photos for social media uploads, creating thumbnails for websites, resizing product images for e-commerce listings, scaling down high-resolution photos for email, and much more.
All image processing runs directly in your browser using the HTML5 Canvas API — a powerful, built-in browser technology that handles graphics operations without any server involvement. Your original image is never uploaded, transmitted, or stored anywhere. The resized result is generated on-demand and downloaded directly to your device.
The three fit modes give you complete control over how your image adapts to the target dimensions. 'Contain' is best for profile photos and thumbnails where the full image must be visible. 'Cover' works well for hero images and backgrounds where filling the entire frame matters more than showing every pixel of the original. 'Stretch' is useful for icons and UI elements where exact dimensions are required regardless of distortion.
The output format and quality options add an extra layer of control. By choosing WEBP output, you can simultaneously resize and convert to a more efficient format, saving storage space and bandwidth. This makes the Image Resizer particularly valuable for web developers optimizing assets, bloggers preparing featured images, and social media managers maintaining consistent dimensions across platforms.