Images & Design
Free Image Resizer
Resize to exact pixels or a percentage, without distorting the image.
Free to useNo sign-up requiredNo watermarkRuns in your browser
This free image resizer changes an image to the exact pixel dimensions you need, or scales it by a percentage. The aspect ratio is locked by default, so setting the width updates the height automatically and the image is never stretched.
Resizing is usually the right first move when a photo is too heavy for a website or an upload form. Reducing the pixel count cuts the file size far more effectively than compression alone.
How this tool works
Choose your image
The current dimensions are read and filled in for you.
Set a width or a height
With the ratio locked, the other dimension follows. Quick buttons give you 25%, 50% and 75% of the original.
Check the preview
The result is shown beside the original with its new dimensions and file size.
Download
Choose JPG, PNG or WebP for the output, depending on what the image is for.
How it works
The image is redrawn at the new size on a canvas with high-quality smoothing enabled, which gives noticeably better results when scaling down than the browser default.
With the ratio locked, the second dimension is calculated from the original proportions and rounded to the nearest pixel. Unlock it only when you genuinely want to distort the image.
Scaling down is safe and usually improves file size dramatically. Scaling up cannot invent detail that was never captured, so enlarged images always look softer than the original.
Everything happens in your browser, so there is no upload and no limit imposed by a server.
Dimensions worth knowing
| Full-width web image | 1600-2000 px wide |
|---|---|
| Blog body image | 800-1200 px wide |
| Thumbnail | 300-400 px wide |
| Open Graph / social preview | 1200 × 630 px |
| Instagram square | 1080 × 1080 px |
| YouTube thumbnail | 1280 × 720 px |
| Email signature logo | 150-300 px wide |
| Favicon source | 512 × 512 px |
Why enlarging disappoints
Making an image bigger stretches the pixels that already exist. There is no additional detail to recover, so edges soften and textures smear. Doubling the size of a small image will always look worse than the original at its native size.
Always resize down from the largest version you have. If the only copy is small, the honest options are to re-shoot, re-export from the source file, or design around the size you have.
Worked examples
A phone photo for a website
Set the width to 1600 with the ratio locked. Most screens never need more, and the file gets far smaller.
A social preview image
Unlock the ratio and set 1200 × 630 exactly, accepting that a differently proportioned original will be squashed - or crop it first.
Halving everything
Press the 50% button to scale both dimensions at once.
Frequently asked questions
Is this image resizer free?
Yes - free, no sign-up, no watermark and no limit on how many images you resize.
Are my images uploaded to a server?
No. Your images never leave your device. They are decoded and re-encoded by your browser, so nothing is transmitted to VSThiran and no copy is kept anywhere.
Will resizing distort my image?
Not with the aspect ratio locked, which is the default - changing one dimension updates the other. Unlock it only when you deliberately want to change the proportions.
Can I make an image larger?
You can, but it will look softer. Enlarging stretches existing pixels rather than adding detail. Always resize down from the biggest version you have.
What is the difference between resizing and compressing?
Resizing changes the pixel dimensions. Compressing keeps the dimensions but stores the image less precisely. For the biggest saving, resize first and then compress.
Does it keep transparency?
PNG and WebP output keep the alpha channel. JPG has no transparency, so transparent areas are filled with white rather than turning black.
Guides for this tool
How to resize an image without installing software
Need an image at exact dimensions for a website, listing or upload form? Resize it in your browser with VSThiran - set the width or height and download the result.
Need a smaller image for email? Compress it in your browser
Image too large to email or upload? Reduce its file size directly in your browser with VSThiran, then download the smaller image - no signup or software install.
How to convert a PNG to JPG
Need a PNG as a JPG for a smaller file or wider compatibility? Convert it in your browser with VSThiran - choose the quality and download the result.