Upload the film using its actual picture ratio unless you have a specific reason to reframe it. Do not stretch people to make an unusual export fit a standard rectangle, and do not add permanent black borders merely to imitate the player. First measure the file, then decide what composition you want viewers to receive.
Read the dimensions of the export you will upload
Inspect the saved file rather than a generation setting or browser preview. Record width, height, any rotation metadata, and whether the pixels are square. If display aspect metadata differs from the coded dimensions, resolve that difference in the editor before choosing a crop.
For an illustrative square-pixel file of 1536 by 1024, the ratio is 3:2. Calling its project “landscape” does not turn it into 16:9. A portrait file viewed sideways may also need a rotation correction rather than a new crop.
Check a frame with people and familiar shapes. Faces and circles should retain their proportions. The measurement and the visible picture should agree.
Separate player background from bars inside the image
YouTube says its player adapts to different aspect ratios and advises against adding padding directly to the video. Let the player handle ordinary surrounding space.
A black area can have different origins. It may be background outside the video, bars already encoded into the frames, or an intentional part of the composition. Export a still frame or inspect the clip in your editor to identify which one you are seeing.
If borders are already part of the file, removing them is a crop decision. Check whether any useful picture or text occupies that area before trimming it.
Choose one of three framing decisions
Preserve the native picture when it communicates the scene well. An unconventional ratio is not automatically a technical failure.
Crop when the delivery brief requires another shape and the remaining composition still works. Inspect the entire shot, not just the first frame: a face, moving hand, or ring box may enter the area removed later.
Create a separate composition when a crop cannot retain the important action. A horizontal film and a vertical teaser can require different shot selection and caption placement. Duplicating the export settings does not solve that editorial problem.
Avoid stretching the image to fill the target. It changes body proportions and can make a technically accepted upload look visibly wrong.
Check the timeline and export together
Set the sequence to the intended delivery shape and inspect scaling on each clip. Mixed source ratios can accidentally inherit a fill or fit setting from an earlier shot.
Decide whether empty space is intentional. A designed background containing readable captions is different from adding generic black padding for compatibility. Document that choice so a later editor does not “fix” an approved layout.
Export a short representative passage containing the widest framing, the closest face, and any edge text. Review that actual file before exporting the whole film. Keep the original source available for a different version.
Verify the uploaded viewing experience
After processing, watch on a phone and a desktop. Check picture proportions, framing through movement, subtitle readability, and whether borders are inside the image or around it.
Do not judge solely from the upload thumbnail or editor preview. Seek through the finished playback and compare a few frames with the local export.
Accept the version when the intended action survives, bodies remain proportionate, and no accidental padding has been baked into the picture. If the upload looks different, investigate the exported geometry and playback context before regenerating an otherwise usable scene.