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Image Resizer
Image Resizer scales pictures to exact pixel dimensions or by a percentage, with an aspect-ratio lock so nothing is stretched. Cutting a 4000-pixel camera photo down to 1200 pixels for the web takes a few seconds and happens entirely on your device.
How to use Image Resizer
- Upload the image and read its original dimensions from the panel.
- Enter the width and height you want, or use the percentage scale.
- Resize and download the result.
Where Image Resizer is useful
- Shrinking camera photos before publishing them on a website.
- Hitting an exact pixel size required by a form or profile page.
- Scaling avatars and thumbnails consistently across a set.
Formats, algorithms and limits
Scaling is done with high-quality canvas resampling, which is the same interpolation approach used by image editors. Downscaling produces a slightly softer but artefact-free result; upscaling beyond roughly 150% cannot invent detail that was never captured.
Troubleshooting and honest limits
- Keep the ratio locked unless a form demands a specific aspect ratio; free resizing stretches the picture.
- Downscale in one step rather than repeated small steps to avoid cumulative softness.
- Check the output dimensions in the panel after conversion if the exact size matters.
Frequently asked questions
Does resizing change the file format?
No. The output keeps the format of the source image unless you convert it as well.
Can I resize several images to the same size?
Yes. Add multiple files, set the target dimensions once and every image in the queue is resized to match.
Does enlarging an image add detail?
No. Upscaling interpolates new pixels between existing ones, which smooths the picture but cannot recover information that was not captured.
What happens to the original file?
Nothing. Your source image stays untouched on disk; only the resized copy is written as a download.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. Image Resizer runs entirely in your browser — no uploads, no account and no daily limits.