Black Bars and Cropped Images: Why It Happens and How to Fix It
Black bars and cropped images have different causes that are often confused because they look superficially similar. Black bars are a correct display of content that does not match the display's aspect ratio. Cropping is a settings decision — either on the television or the source device — that removes part of the image to fill the screen. Understanding which you have determines where to look for the solution.
Black bars — when they are correct
A 16:9 television displaying content in a wider aspect ratio — 2.35:1 or 2.39:1, which is common in cinema releases — will show horizontal black bars above and below the image. This is called letterboxing and it is the correct display of the content. The bars are not a fault; they are the space occupied by the difference between the content's aspect ratio and the display's aspect ratio.
Similarly, content in 4:3 (older television programmes, some archive footage) displayed on a 16:9 screen will show vertical black bars on the sides. This is called pillarboxing and is again correct — the content does not fill the wider screen.
Attempting to eliminate these bars by stretching or zooming the image distorts the picture geometry. Faces become wider, circles become ovals, and on-screen text becomes hard to read. The black bars exist because the content was made for a different shape — they are not a problem with the television.
When black bars indicate a settings problem
Black bars become a settings problem when they appear on content that should fill the 16:9 screen — standard widescreen broadcast television, most streaming content, modern gaming. In this case, the cause is usually a mismatch between the aspect ratio settings on the source device or the television's picture size setting.
The most common scenario: a source device (a set-top box, games console, streaming device) is set to output a resolution or aspect ratio that does not match the television's native format. The television then letterboxes or pillarboxes the incoming signal. Checking the output resolution settings on the source device — usually found in the device's display or video settings — and setting them to match the television's native resolution resolves this in most cases.
A source device set to 1080i output connected to a 4K television will sometimes cause unexpected scaling artefacts, including apparent bars from the TV's upscaling process. Setting the source to 1080p or 4K output avoids the interlaced signal handling entirely.
Overscan and cropped edges
Overscan is a legacy television practice where the displayed image is slightly larger than the signal — the outer edges are cropped off. It originated in CRT television to hide the signal noise that existed at the edges of analogue broadcasts. It is irrelevant to digital signals and modern flat panels but persists as a default setting on many televisions and source devices, causing the outer few percent of the image to be cut off.
The symptom: on-screen text or UI elements near the screen edges are partially cut off; the image looks slightly zoomed in compared to what you might expect; or, in gaming, HUD elements near the corners are clipped.
The solution is to disable overscan. On the television, this is found under picture size, screen size, or display settings — look for options labelled Just Scan, Full, Dot by Dot, or 1:1 Pixel Mapping. These modes disable overscan and display the full signal without cropping. On source devices, particularly older or budget set-top boxes, there may be an overscan or picture size setting that needs to be set to 0% or Off.
The television's picture size or zoom mode
Many televisions have a picture size or zoom mode control that is separate from overscan — it controls how the television scales incoming content. Common modes include Auto, Normal, Wide, Zoom, and Cinema Zoom. In modes other than Auto or Normal, the television may be actively cropping or stretching the incoming signal.
If the image appears cropped and overscan is disabled, checking the picture size mode is the next step. Setting it to Auto or Normal typically produces the correct full-screen display without cropping for standard widescreen content. Wide and Zoom modes stretch or enlarge the image to fill the screen, which is useful in specific circumstances but will crop content that does not fill the screen naturally.
Black bars that move or change
On streaming services and broadcast television, the aspect ratio of content can change between programmes or even within a programme — a 16:9 drama may include archival footage in 4:3, or a streaming film may shift between aspect ratios for artistic reasons. This is content behaviour, not a television fault. The bars appearing and disappearing as content changes is the television correctly adjusting to the incoming signal.