Support » Fixing WordPress » Image File Naming

  • Hi All!

    I’ve been poking around the Codex in hopes of finding out how WP renames image files when you upload them… it’s probably there but I can’t seem to find it.

    It seems that if I upload 1 file, like xue.jpg, that I get many files, like:

    and so on. I take it that WP is making a series of different sizes for easy use in resizing or thumbnails or different displays or, haha, IDK really why WP does this, but I assume it’s something like that.

    So FIRST QUESTION – why is WP doing this and is there a predictable format to understand what the naming is?

    SECOND QUESTION – I’m not certain this is the issue, but it seems that when I try to import a site using WP importer v0.6 that I get a lot of broken links which seem to be related to this naming issue. The post will call for, eg:

    but the importer didn’t get that file. It DID get

    and if I manually go through the posts and delete the “-456×789” so it’s calling for just “xue.jpg” then the image IS there and it does load. But this isn’t practical for lots of posts.

    I’d like to understand better how images are being renamed on upload, and how this does or doesn’t get handled if the blog is later imported to another host.


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  • You can define the thumbnail, medium and large sizes at


    WordPress will try to resize your images within these limits but the exact size will vary based on size of each image.

    may help if you have some image sizes missing after an import.

    To make sure you import all images, do not download attachments while you do the import.

    Instead make a backup of your wp-contents/uploads folder and upload it to your new domain.

    Also, a plugin like can make your site migration smooth.

    Thanks Ravi, I’ll take a look at backupbuddy.

    I thought the problem with just FTPing your wp-content/uploads was that then ALL of your files will be “unattached” from the posts and, for example, “Gallery” displays won’t work.

    But yes, that should make the files work if the importer properly renames on import (as far as I can see the importer does a lot of wild guessing on import renaming, doing a good job often, but also making “mistakes”)

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