DevDockTools

Image Resizer

Resize any image to custom dimensions with optional aspect ratio lock. Supports all major image formats and exports as PNG or JPEG.

Resizing an image in the browser is instant and private — no upload required. Lock the aspect ratio to avoid distortion, or set exact pixel dimensions for social media, email headers, or specific upload requirements.

Social media image sizingEmail header imagesAvatar & profile photosReducing file size by scaling down
100% private — all processing runs in your browser. No files are uploaded to any server.

Drag & drop or click to upload

Supports JPG, PNG, WebP, GIF and more

Frequently Asked Questions

Can I resize multiple images at once?

Currently the tool processes one image at a time. Batch processing is on our roadmap.

What does 'lock aspect ratio' do?

When enabled, changing either the width or height automatically adjusts the other value proportionally, preventing the image from being stretched or squashed.

Does resizing reduce file size?

Yes. A smaller image has fewer pixels and therefore a smaller file size. For example, scaling a 4000×3000 image down to 800×600 reduces pixel count by 95% and file size significantly.

What formats can I export the resized image as?

You can export the resized image as PNG (lossless) or JPEG (smaller file size). PNG is recommended for graphics and logos; JPEG for photographs.

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