Fix Windows Media Player Error 0XC00D100F: Image Size Mismatch

What triggers this error?

You're trying to add an image to a Windows Media Player (WMP) playlist or slideshow, and boom—error 0XC00D100F. The message says the image's size isn't evenly divisible by the 'positionImage's size.' I've seen this mostly with screenshots, phone photos, or images you've cropped oddly. WMP expects images to have dimensions that are multiples of something (usually 16 or 8), so a 1920x1080 image works fine, but a 1921x1080? Nope.

This isn't a corrupt file or a codec problem—it's a math problem. WMP's slideshow engine is old and rigid. Here's how to beat it.

Quick fix (30 seconds): Resize the image

The simplest fix: open the offending image in Paint (yes, the built-in Windows app) and resize it to dimensions that divide evenly by 16. For most screens, just change the width or height by a pixel or two.

1. Right-click the image and select Open with > Paint.
2. Click Resize (the button looks like two squares).
3. Check Pixels and make sure Maintain aspect ratio is unchecked.
4. Enter a width that's divisible by 16, like 1920 (if original was 1921). Or try 1280, 1600, or 1024.
5. Click OK, then File > Save As (save as PNG or JPEG).
6. Try adding the new file to your WMP playlist.

I've fixed this for dozens of users with just this step. If it works, you're done. If not, move to the next fix.

Moderate fix (5 minutes): Batch resize all images

If you have a folder of images giving the same error, fix them all at once. You don't need fancy software—PowerToys Image Resizer works great and is free.

1. Download and install Microsoft PowerToys from the official site (or use the built-in PowerToys if you already have it).
2. Select all the problem images in File Explorer (hold Ctrl and click each one).
3. Right-click and choose Resize pictures.
4. Pick a preset like 1920x1080 or 1280x720. These are both divisible by 16.
5. Uncheck Make pictures smaller but not larger to force the resize.
6. Click Resize. A new folder with resized copies will appear.
7. Point WMP to the new copies.

If you don't want to install PowerToys, you can use the free tool IrfanView with its batch conversion feature—just set the output dimensions to multiples of 16.

Advanced fix (15+ minutes): Change the image format or fix the playlist

Still stuck? The error might not be about pixel dimensions—it could be the image format or a corrupt playlist. Let's check both.

Convert to a different format

WMP prefers JPEG or PNG. If your image is a BMP, TIFF, or GIF, convert it.

1. Open the image in Paint.
2. Click File > Save As.
3. Choose JPEG picture or PNG picture.
4. Name it something new and save.
5. Try adding it to WMP.

Recreate the playlist

Sometimes the playlist file itself gets corrupted, especially if you've dragged and dropped images from different sources.

1. In Windows Media Player, right-click the playlist and select Delete (choose Remove from library only).
2. Create a new playlist: click Create playlist at the top.
3. Drag in your images one at a time—don't use a bulk import. This helps isolate the bad file.
4. If you find one that triggers the error, resize it as described above.

Check your image for hidden transparency or odd color depths

This is rare, but I've seen PNG images with alpha channels cause this error. WMP's slideshow engine chokes on transparency. Quick fix:

1. Open the PNG in Paint.
2. Click File > Save As > JPEG picture. JPEG doesn't support transparency, so it flattens the image.
3. Use that JPEG in WMP instead.

Why this happens (and why it's silly)

Windows Media Player's slideshow feature was designed years ago when digital cameras and screens had strict dimension standards—like 640x480 or 1024x768. Modern images from phones and custom crops rarely follow those old rules. The error code NS_E_WMP_CS_NOTEVENLYDIVISIBLE is Microsoft's way of saying 'your image doesn't fit our grid.' Annoying, but easy to work around.

If none of these fixes work, you can always use a different media player. I recommend VLC Media Player—it handles slideshows without any dimension restrictions. But if you're stuck with WMP for work or habit, the Paint resize trick is your friend.

One last thing: if you see this error with video files (unlikely but possible), the same logic applies—check the video resolution. Most video containers like MP4 or AVI have dimensions that already divide evenly, so it's almost always images.