This guide is prepared by the BestAI Editorial Team. It explains recommended workflows, not guaranteed performance. Always review automated output before publishing.
Start with the mobile screen, not the desktop preview
A subtitle that looks comfortable on a large monitor can become tiny after the video is viewed inside a mobile app. Preview the final 9:16 output at phone size and check it from normal viewing distance rather than zooming into the timeline.
Use a bold Bangla font with clear vowel marks and enough spacing between characters. Decorative typefaces may suit a title card, but dialogue subtitles should prioritise fast recognition.
Keep line length under control
Long Bangla sentences create dense blocks that are difficult to read before the speaker finishes. Break the text at a natural phrase boundary and keep most subtitles to one or two lines. Avoid splitting a name, number or short phrase across lines when possible.
Automatic transcription often produces a full sentence as one caption. Review the timing and divide it into smaller meaning groups so each caption appears with the words being spoken.
Choose a safe vertical position
The lower edge of a Short may contain app buttons, captions and navigation controls. Place subtitles above that area while keeping them below the speaker's face. A consistent lower-third position normally works, but interviews with multiple people may need a slightly higher placement.
Check every crop mode. Smart Crop can move the face or subject, so a subtitle position that works for one clip may overlap important action in another.
Use contrast without making the frame noisy
White or light text with a dark outline or soft background usually remains readable across changing footage. Use a strong outline instead of a large opaque box when you want to preserve the image. Avoid several colours in the same sentence unless the design has a clear purpose.
Word highlighting can help viewers follow fast speech, but the highlight colour must remain readable over both bright and dark scenes. Test skin tones, sky, indoor walls and night footage.
Review language, spelling and timing
Bangla names, regional words and mixed English terms are common sources of transcription mistakes. Correct spelling manually and keep one spelling style throughout the video. Do not publish subtitles that change the meaning of a quotation or factual statement.
Watch the full Short once without pausing. If captions appear late, disappear too early or change before the viewer can finish reading, adjust the segment timing rather than only reducing the font size.
Frequently asked questions
How many lines should a Bangla subtitle use?
One or two lines are normally easier to read on mobile. Break longer sentences at natural phrase boundaries.
Should every spoken word be highlighted?
No. Highlighting can add energy, but excessive movement may reduce readability.
Where should subtitles sit in a 9:16 video?
Use a lower-third position above platform controls and check that faces and key actions remain visible.