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Image Resizer

100% Free

Resize images to any dimension while preserving aspect ratio. Free and instant.

Real-time
Client-Side
Aspect lock

Embed This Tool

Easy to Embed

Add Image Resizer to your website or blog in seconds.

  • Responsive design
  • Lightweight & fast
  • No backend required
  • Always up-to-date 
<iframe
  src="https://tools.town/embed/image-resizer/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="Image Resizer">
</iframe>

Share This Tool

Share Instantly

Share Image Resizer with anyone — no login required.

  • Shareable link
  • No login required
  • Works on any device
  • No account needed

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How to use

  1. Upload your image (JPG, PNG, WebP, or GIF).
  2. Enter the target width or height — the other dimension updates automatically to preserve the aspect ratio.
  3. Or pick a preset (1080×1080 for Instagram, 1280×720 for YouTube thumbnail, etc.).
  4. Click Resize & Download.

Common use cases

  • Social media — resize to platform-specific dimensions (Instagram, Twitter, LinkedIn).
  • Email attachments — reduce dimensions so images load fast in email clients.
  • Web optimisation — serve images at the exact size they display, eliminating layout shift.

Frequently Asked Questions

Will resizing reduce image quality?
Downscaling (making smaller) rarely causes visible quality loss. Upscaling (making larger) can cause softness — we use bicubic interpolation to minimise this.
Can I lock the aspect ratio?
Yes. Aspect ratio is locked by default. Uncheck the lock icon to set width and height independently.
What output formats are supported?
JPG, PNG, and WebP. You can choose the output format independently of the input.
Is my image uploaded anywhere?
No. Resizing runs entirely in your browser using the Canvas API. Nothing leaves your device.
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Want to understand the math?

Browse all guides →
How to Use Image Resizer
image

How to Use Image Resizer — Complete Guide

Learn how to resize images to any dimension while maintaining aspect ratio using Tools.Town's free Image Resizer.

8 May 2026

5 min read

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