ToolImage Resizer — Resize Images by Pixels or Percentage
Set a photo’s width and height in pixels or scale it by a percentage. Resize images locally in your browser, with an aspect-ratio lock to help preserve their proportions.
Choose pixel dimensions or a percentage
Use pixel mode when a website gives a specific width and height, such as 800 × 600 pixels. Use percentage mode when you want an image smaller in both directions: 50% makes the width and height half their original values.
Keep the aspect ratio locked to preserve the image’s proportions. A width and height with a different ratio can stretch the picture. If the destination also has a KB limit, use the image compressor and check the final dimensions and file size together.
Resizing is different from converting a file
Resizing changes dimensions. It does not guarantee a particular file size or recover detail that was absent from the original photo. For a different file format, use the image converter. For a document photo preset, start with the application photo resizer and compare its output with your form’s current requirements.
How to resize an image online
- Upload one or more images — drag & drop or click to browse.
- Choose By Pixels for an exact width/height, or By Percent for quick scaling (settings apply to all).
- Lock aspect ratio to avoid stretching, if needed.
- Click Resize Images and download individually or as a ZIP.
Related tools
Frequently asked questions
How do I resize an image to exact pixel dimensions?
Upload your image, switch to By Pixels mode, enter a width or height (aspect ratio locks automatically), and click Resize Image.
Can I resize by percentage instead of pixels?
Yes. Switch to By Percent mode and drag the slider — for example 50% halves both width and height.
Will resizing change my image's format?
No, the output keeps your original file format (JPG stays JPG, PNG stays PNG) unless you use the separate Image Converter tool.
Does resizing reduce quality?
Scaling down generally preserves visual quality well. Scaling up beyond the original resolution can look softer, since no new detail is added.