How do physical print dimensions work?

When you specify centimeters or inches, the tool uses your selected DPI (default 300 DPI for print) to calculate the exact pixel dimensions.

Are my original image files modified?

No. The tool outputs a new resized file while leaving your original intact.

What is the difference between nearest-neighbor and bicubic resampling?

Nearest-neighbor preserves sharp hard pixels (ideal for pixel art), while bicubic/bilinear interpolation calculates smooth weighted averages between pixels (ideal for photos).

Can I resize an image by setting only the width?

Yes. Enable the 'Lock Aspect Ratio' link, and the height will automatically calculate to match your target width proportionally.

Image Resizer

Change image dimensions easily with aspect ratio locking.

100% In-Browser

All-In-One StudioBulk + Single

Want to process images in bulk, add compressions, conversions, filters & background removal all in one flow?

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Your files and data are processed locally and never leave your device.

Select Any Image files to convert

Upload one or multiple Any Image images. Converts 100% locally in your browser.

Formats: JPG, PNG, WebP, AVIF•Max size: 150MB •100% In-Browser

What is Image Resizer?

Image Resizer enables precise scaling and dimension adjustments for any raster image. Whether you need exact pixel dimensions (e.g. 1920x1080), physical print dimensions (in cm, mm, or inches at custom DPI), or proportional percentage scaling, it resamples pixels smoothly using high-quality bilinear interpolation.

Zero-Server Client-Side Guarantee

Unlike legacy online utilities that upload sensitive media and documents to remote cloud storage, Shadow Toolkit executes this entire operation directly within your browser's local runtime. Your raw data never crosses the network.

Key Capabilities

Custom pixel dimension resizing with aspect ratio lock/unlock
Physical unit conversion (Centimeters, Millimeters, Inches) with DPI calculation
High-quality bicubic/bilinear canvas resampling algorithms
Real-time dimension, aspect ratio, and estimated file weight display
100% private client-side execution with zero cloud latency

Common Use Cases

1Resizing photos to exact width and height specifications for web CMS systems

2Converting digital images to physical print dimensions (3.5x4.5 cm passport photos at 300 DPI)

3Creating responsive image variants (small, medium, large) for frontend responsive design

4Optimizing raster graphics and illustrations for high-performance responsive web design and mobile apps

How to use Image Resizer

Upload Image

Select the photo or graphic you want to resize.

Enter Dimensions

Specify target width/height in pixels or choose physical units (cm/inches).

Lock Aspect Ratio

Keep aspect ratio locked to prevent image distortion, or unlock for custom stretching.

Download Resized Image

Click 'Download' to save your resized asset.

Frequently Asked Questions

Enlarging raster images may cause softening or pixelation. For best results, resize down from high-resolution originals.

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