Image Resizer (Client-Side)
Resize any image directly in your browser — no upload to server. Maintains aspect ratio. Download instantly.
About this calculator
Resize an image in your browser: set the new width or height, keep the aspect ratio, pick JPEG, PNG or WebP and quality, then download.
The image never leaves your device.
How to use it
- Choose an image.
- Enter the width or height (ratio lock keeps proportions).
- Pick the format and quality and press Resize & Download.
Resizing and quality
Shrinking reduces pixels and file size; enlarging cannot add detail, so it looks soft. JPEG is best for photos (quality 80 to 90 is usually indistinguishable), PNG for graphics with transparency, WebP for smaller files in both cases. Keep the aspect ratio locked to avoid stretching.
Worked example
Example 4000×3000 at width 1200 gives 1200×900 (ratio 4:3 kept).
Tips and common mistakes
- Resize before uploading to save bandwidth.
- Quality 80 to 90 is a good balance.
- Don't enlarge small images.
- Use WebP for web where supported.
- Keep your original.
Frequently asked questions
How do I resize without distortion?
Lock the aspect ratio.
Which format is smallest?
WebP is usually smallest.
Does it reduce file size?
Yes, fewer pixels and lower quality both help.
Is my image uploaded?
No.
Can I enlarge?
You can, but quality drops.
Is it free?
Yes.