You will be asked for your Instagram password, then, once you’ve entered it, told that Instagram is putting together your download. The service claims this could take up to 14 days, but for me it was more like 15 minutes. You will get an email linking you to your download, which will be a ZIP file. Save it.

Sign up for a Pixelfed account, if you haven't already. Note that Pixelfed is hosted on multiple servers, all run by volunteers, similar to Mastodon. There’s a list of general purpose servers—read up a little before choosing a server you like. After you've set up your account, click the arrow beside the Create New Post button and click Account Settings.

Click Import in the left sidebar, then click the blue Import button under Import from Instagram. Note that some servers restrict this feature—for example, your account might need to be a couple of days old before you can use it. In those situations you'll see a note explaining that the feature isn't available to you.