Resize AVIF Images
You have an AVIF picture whose pixels do not suit where it is going: a page layout wants it narrower, an upload form has a size limit, or a design needs an exact box. This resizer changes only the width and height and writes the result as another AVIF, so the file type does not change. It runs on your device, and nothing is uploaded.
How to resize AVIF images
- Add your AVIF files by dropping them, clicking the drop zone or pasting.
- Choose the new size: a percentage, a maximum width and height, or an exact size. The quick sizes fill in common values.
- Press Resize and compare the old and new size of each file. The file type stays the same.
- Download each file or all of them as a ZIP.
When to resize, and when not to
- An AVIF is far larger in pixels than the space it fills on a page, and you want a lighter copy that is still an AVIF.
- A form, template or layout asks for a fixed width and height and your AVIF has another size.
- You need several AVIF files brought to one size before you use them together.
- Do not enlarge a small AVIF hoping to gain detail. Making it bigger only spreads the same pixels over a larger area. If you need a different file type, use the Image Converter instead.
What changes
- The file stays an AVIF. Nothing is quietly turned into a PNG or a JPG.
- Your browser must be able to both read and write AVIF. If it cannot write AVIF, the tool says so and does not resize the file.
- AVIF is lossy, so the picture is encoded again after resizing. The quality slider sets how much detail the new file keeps.
- Transparent areas stay transparent.
- Metadata such as camera details and location is not written to the new file, and a photo's rotation is applied so it comes out the right way up.
Why an AVIF resizer needs a browser that can write AVIF
Reading an AVIF and writing one are different abilities. Some browsers open AVIF pictures but cannot create them. The resizer checks this when the page loads. If your browser cannot write AVIF, the tool tells you and does not resize the file, and it will not quietly hand you a JPG or PNG in its place.
What a second encoding does to the picture
An AVIF stores its picture with lossy compression. To resize it, the tool decodes the picture, scales the pixels and encodes a new AVIF. That second encoding can lower quality a little more, which matters most when the same picture is resized again and again. Resize from the best original you have rather than from a copy that was already resized and saved.
The quality slider controls the new file. A higher value keeps more detail and gives a bigger file, and a lower value gives a smaller file with softer detail. Encoding AVIF can be slow for large pictures, so allow time for big batches. Files are processed one after another, and you can download them together as a ZIP.
Choosing a size and a file size target
Use Percent to scale everything by the same amount, Max size to keep a picture inside a box without ever enlarging it, or Exact size when you need a fixed width and height. With Exact size, Fit inside keeps the whole picture and leaves the spare space transparent, Fill and crop covers the whole box and trims the edges, and Stretch changes the proportions.
If you need a file below a certain number of kilobytes, switch on Aim for a file size. For AVIF the tool looks for the highest quality that fits and shrinks the pixels only when quality alone cannot reach the target. Each result is named with the original name and the new size, so it never replaces your original.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
Frequently asked questions
Will my AVIF stay an AVIF?
Yes. The resizer never changes the file type. If you want another format, use the Image Converter.
Why does the tool say my browser cannot write AVIF?
Your browser can open AVIF but cannot create it. Try another current browser, or use a tool for a format your browser can write.
Does resizing an AVIF reduce its quality?
The picture is encoded again, so a little more detail can be lost on top of what the first encoding removed.
Can I make an AVIF bigger?
Yes, with a Percent above 100 or with Exact size. It adds pixels but not detail, so the enlarged picture looks soft.
How do I get an AVIF under a certain size?
Switch on Aim for a file size and enter the kilobytes. The tool picks the quality and shrinks the pixels only if it has to.
Is my picture uploaded?
No. It is resized inside this browser tab and never sent to a server.