Possible bug

Is this a possible bug in a feature of sharp, unrelated to installation?

• Running npm install sharp completes without error.
• Running node -e "require('sharp')" completes without error.

If you cannot confirm both of these, please open an installation issue instead.

Are you using the latest version of sharp?

• I am using the latest version of sharp as reported by npm view sharp dist-tags.latest.

0.34.3

If you cannot confirm this, please upgrade to the latest version and try again before opening an issue.

If you are using another package which depends on a version of sharp that is not the latest, please open an issue against that package instead.

What is the output of running npx envinfo --binaries --system --npmPackages=sharp --npmGlobalPackages=sharp?

  System:
    OS: Linux 6.14 Ubuntu 25.04 25.04 (Plucky Puffin)
    CPU: (20) x64 13th Gen Intel(R) Core(TM) i7-13700H
    Memory: 13.00 GB / 30.43 GB
    Container: Yes
    Shell: 5.9 - /usr/bin/zsh
  Binaries:
    Node: 22.14.0 - ~/.nvm/versions/node/v22.14.0/bin/node
    Yarn: 3.6.1 - ~/.nvm/versions/node/v22.14.0/bin/yarn
    npm: 10.9.2 - ~/.nvm/versions/node/v22.14.0/bin/npm

Does this problem relate to file caching?

The default behaviour of libvips is to cache input files, which can lead to EBUSY or EPERM errors on Windows.
Use sharp.cache(false) to switch this feature off.

• Adding sharp.cache(false) does not fix this problem.

Does this problem relate to images appearing to have been rotated by 90 degrees?

Images that contain EXIF Orientation metadata are not auto-oriented. By default, EXIF metadata is removed.

• To auto-orient pixel values use the parameter-less rotate() operation.

• To retain EXIF Orientation use keepExif().

• Using rotate() or keepExif() does not fix this problem.

What are the steps to reproduce?

Try to convert a portrait image to avif while resizing it

1. load a portrait image with readFile for example
2. transform into avif and auto rotate Sharp(input).resize({width: 600}).rotate().toFormat('avif').toBuffer()
3. write it down width writeFile for example

Produced image is 90° rotated

What is the expected behaviour?

Image should not be rotated

Please provide a minimal, standalone code sample, without other dependencies, that demonstrates this problem

• try the above steps
• note that rotate before resize do not produce the issue (or solve it depending how you see it)
• note that this is specific to avif the issue is not present with webp or other format I tested

Please provide sample image(s) that help explain this problem

I hope you're not allergic to cheese :)