Online Image Resizer

Original Size: × pixels

10% 200%

New Size: × pixels

How it Works

The online image resizer uses HTML5 Canvas API to process images locally in your browser, without uploading to any server, ensuring your privacy.

Resizing Process:

  1. 1. Read Image: Use FileReader API to read your selected image file.
  2. 2. Create Canvas: Create a new Canvas element in memory with target dimensions.
  3. 3. Redraw: Draw original image onto new canvas, browser automatically applies interpolation.
  4. 4. Export: Convert Canvas to image format (PNG/JPEG) and trigger download.

Use Cases

Social Media Posting

Resize images to meet different platform requirements (Facebook, Instagram, Twitter, LinkedIn).

Website Optimization

Reduce image dimensions to decrease page load time and improve site performance.

Print Preparation

Adjust images to specific print dimensions and resolution for quality output.

Frequently Asked Questions

Will resizing reduce image quality?
Downsizing typically has minimal quality loss as excess pixels are discarded. Upsizing will cause some blurriness because the browser must interpolate new pixels. Always keep a backup of the original image.
Is my image uploaded to a server?
No. All processing happens locally in your browser. Your image never leaves your device, ensuring complete privacy and security.
What image formats are supported?
Supports all formats modern browsers can handle, including JPG/JPEG, PNG, WebP, GIF, BMP. Output defaults to PNG (lossless) or can be JPEG (smaller file size).
What does maintaining aspect ratio mean?
Maintaining aspect ratio keeps the width-to-height proportion constant, preventing the image from being stretched or squashed. When enabled, adjusting width auto-adjusts height, and vice versa.
Can I resize multiple images at once?
The current version processes one image at a time. For batch processing, consider using dedicated batch image processing tools or desktop software.
Will EXIF data be preserved?
No. Canvas-exported images lose original EXIF metadata (like capture date, camera model, GPS location). Use professional image editing software if you need to preserve metadata.
What's the maximum image size I can process?
Depends on your device performance and browser memory limits. Generally, images up to several dozen MB can be processed. Very large images (like high-res panoramas) may slow down or crash the browser.
Why is percentage resizing more convenient?
Percentage resizing doesn't require calculating exact pixels - just know how much you want to scale. For example, 50% halves the size, 200% doubles it. Perfect for quick adjustments.

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