Why does my vertical product video have black bars on every side?

Find the first padded frame

Pause on a frame where the product is fully visible and inspect the actual image boundary. If the black area is already inside the exported source, the padding was baked into the clip before editing. If the source reaches all four edges but the editor preview adds bars, the problem is a sequence or display-fit setting.

A portrait player cannot recover image area that was exported as black pixels. Treat the inner picture as the usable source and record its ratio before making a change. Do not stretch the clip to fill the portrait canvas: that changes the product’s shape and can make visual evidence misleading.

1. Open the original clip without the portrait project or player.
2. Pause on a frame with a clear product edge and compare the picture boundary with the file boundary.
3. Check whether black pixels belong to the source, the editing sequence, or the player preview.
4. Replace or reframe the identified accidental padding stage; retain documented intentional matte. Then inspect the exported opening, action and ending frames without distorting the product.

Separate source, sequence and nesting

A clean 16:9 picture fitted proportionally inside a 9:16 canvas normally leaves top and bottom space, not black on all four sides by itself. MDN distinguishes contain, cover and fill behavior for web display; editor controls may use different names. Four-sided margins can arise when the file already contains side bars or a smaller active picture and another stage fits that whole canvas into a new box. Inspect those actual boundaries before concluding that one specific ratio or an extra fit operation is wrong.

If the clip sits inside a nested composition, inspect both levels. The inner composition may contain a smaller active picture, while the outer sequence fits the complete inner canvas. Determine which stage contributes top/bottom or left/right space from the actual boundaries; do not infer four-sided bars from ratio names alone. Name each level in your review notes so a later export does not hide the cause.

1. Compare the source dimensions with the inner composition dimensions.
2. Open the outer portrait sequence and identify whether the nested item is set to fit, contain, or fill.
3. Temporarily disable background or matte layers to distinguish design padding from accidental padding.
4. Export a short test and inspect the pixels outside the product frame.

Geometry example, not an executed video test: with square pixels, proportionally containing a 1920 × 1080 canvas in 1080 × 1920 gives a 1080 × 607.5 picture. If that source contains only top/bottom bars around a 1920 × 800 active image, the active image becomes 1080 × 450: it still reaches both side edges. Four-sided space needs a narrower active picture, extra scaling or another padding stage. Real exports must account for rounding, pixel aspect ratio and the actual tool settings.

Reframe without distorting evidence

For a vertical product video, scale the usable picture until the product and its required context fit the portrait frame. A crop can remove empty sides from a wide shot, but it may also remove hands, controls, packaging text, or the contact surface that explains what viewers are seeing.

Use a fixed reference frame for every ratio. Mark the product’s left and right limits, top clearance, and any action area before adjusting the crop. If the portrait framing cannot preserve the necessary evidence without an awkward crop, return to the uncropped source or request a new composition rather than forcing the wide export to fill.

1. Choose the evidence frame that must remain visible.
2. Set a crop and scale that keep the product proportional.
3. Review the opening, action, and ending frames for lost context.
4. Stop and change the composition if a crop removes a required label, action, or product boundary.

Verify the export and the publishing handoff

Review the exported portrait file outside the editor because a player may add its own display treatment. Check the first frame, a movement frame, and the final stable frame. The product should remain undistorted, and the visible image should reach the intended portrait bounds without unexplained black regions.

Keep the diagnosis separate from publishing assumptions. CartVisual can support planning and quoted media workflows, but it does not publish the finished video to stores or prove product performance. The practical handoff is a correctly framed file plus notes identifying the source ratio, target ratio, crop decision, and any remaining intentional matte.

1. View the export in a neutral player and compare it with the editor preview.
2. Check one opening, one action, and one ending frame.
3. Confirm the file contains intentional design space only where documented.
4. Stop the repair when the product is distorted, essential evidence is cropped, or the bars originate in an unknown layer.

Double-padding review

After locating the padding stage, use How to reuse one product clip in vertical and horizontal layouts to plan other aspect ratios without losing product evidence.