How to turn off the matte and show art edge to edge

You upload a picture, it appears on The Frame with a thick cream border around it, and the setting to remove the border is either missing or does nothing. This is the most common complaint about custom art on The Frame, and it has two separate causes that get confused with each other.

The two things called "the matte"

The matte style is a presentation the TV draws around a picture: a mount board in a colour and a shape you choose, made to imitate a framed print. It is a per artwork setting and it includes an option called No mat.

The mat you did not ask for is what the TV does when your file does not match the panel. It is not a style choice, it is the TV solving a problem: your image is not 16:9 at panel size, so rather than stretch or crop it without permission, it frames it. In this case the No mat option is either absent or produces a picture that still does not reach the edges.

Almost everyone hitting this problem has the second one and is looking for the fix to the first.

The fix

Upload the file at exactly 3840 by 2160 pixels.

That is the whole answer. The TV offers a true edge to edge presentation when the pixel dimensions of the uploaded file match the panel exactly. One pixel out in either direction, or the right ratio at the wrong size, and you are back to a border. The details, and how to crop to that size without wrecking the composition, are in the size and format guide.

Setting No mat on an image already uploaded

Once the file is the right size, choose the presentation:

Put the TV in Art Mode and open My Photos or My Collection.
Highlight the image and open its options, usually the down arrow on the remote or a Change matte entry.
Choose No mat, or open the mat settings and select the no mat option.

This is per image on most firmware, which is the part that turns tedious. Twenty pictures means twenty trips through the menu with a remote.

The same setting exists in SmartThings under the artwork's options, which is faster than the remote but still one image at a time.

Doing it once instead of twenty times

The matte is part of the instruction that accompanies an upload, so a tool that sends art over the network can set it as it goes.

TV Art Manager always uploads with the matte explicitly disabled and the image prepared to exactly 3840 by 2160, filled and centre cropped. Nothing arrives with a border, and there is no per image menu trip afterwards. That is not a clever feature, it is just the only correct default for artwork you sized yourself.

When you actually want a matte

Turning it off is not always right.

A portrait photograph cannot fill a 16:9 panel. A matte is the honest presentation, and The Frame draws a good one.
A scanned print or a piece with its own paper edge often looks better mounted than bled to the edge.
A small or old image you cannot get to 4K is better matted at its own size than scaled up and soft across the whole panel.

In those cases pick the mat colour against the room rather than against the picture. Warm white and cream disappear on a light wall; black reads as a deliberate frame on a dark one.

If the border is still there

Check the finished file, not the export setting. Right click the file, look at the actual pixel dimensions. Exports land at 3839 or 2161 more often than anyone expects.
Re-upload rather than editing on the TV. The presentation is decided when the file arrives. Fixing the size means sending the file again and deleting the old copy.
Some 0.97 era firmware is stubborn. A few older sets keep a mat on some uploads regardless. If a correctly sized file still shows a border on an old set, that is the firmware, and no tool on any platform gets past it.
Do not confuse the mat with overscan. If the picture reaches the edges but content is cut off, that is a picture size setting on the TV, not the mat.

Once the art fills the screen properly, the next thing worth setting up is changing it automatically, so the effort you put into sizing a set actually gets seen.