Audio description narrates the visual parts of a video for blind viewers, fitting into the gaps between dialogue. This free script editor formats timestamped description lines into a clean table, counts words per line, and warns when a description is too long to fit its gap. No sign-up.
What this tool does
Video teaches visually: diagrams, gestures, demonstrations, and expressions carry meaning that dialogue alone does not. Without description, blind students receive the soundtrack of a lesson, not the lesson. Description restores the visual channel in words.
Good description is concise, objective, and timed. It names what is visible, not what it means, and it fits the silence between speech. A twenty-word description in a five-second gap will overlap dialogue, which helps nobody.
The editor supports that discipline mechanically: timestamps keep order, word counts reveal length, and warnings flag lines over twenty words. The writer still decides the words; the tool keeps them honest about time.
How to use it
- Write one description per line as MM:SS: description.
- Paste the lines into the tool.
- Click format script.
- Shorten any flagged long line, then reformat.
Describe actions and visuals, not interpretations. “She raises her hand” is description; “she is confused” is interpretation, and interpretation belongs to the viewer.
Worked example
Three lines at 00:15, 00:42, and 01:10 describe a teacher writing fractions, students raising hands, and the teacher pointing at a half circle. The table shows each line with its word count, and no warnings fire because every line stays under twenty words.
A line reading “The teacher, wearing a blue shirt and standing beside a large whiteboard covered in fraction diagrams, slowly writes the number one over two” counts over twenty words and gets flagged. The writer shortens it to “The teacher writes one half on the board”, which fits the gap.
For a science demonstration, descriptions name each step as it happens: pouring, color change, measurement. Blind students follow the experiment in real time, instead of hearing reactions to visuals they never received.
Honest limits
This editor formats and length-checks scripts; it does not record narration, mix audio, or verify that gaps in the actual video match the timestamps. Pair the formatted script with a timed listen before publishing.
Tips
Write description during video planning, not after editing. Planned gaps are longer and better placed than gaps discovered afterwards, and the description sounds natural instead of rushed.
Common mistakes
The classic mistake is describing everything, including the obvious. “A man walks into a room” matters only if the room or the walking matters. Describe what carries meaning, and leave the rest silent.
How it fits your week
Draft description scripts alongside lesson videos, one script per video. A formatted script file stored with the video makes future re-edits and translations straightforward.
Audio description is often treated as an extra, but for blind students it is the lesson itself, not an enhancement. A formatted, length-checked script is the difference between description that informs and description that interrupts. Write for the gaps, count the words, respect the dialogue, and let blind viewers receive the visual teaching their classmates receive for free. The editor handles the formatting; the writer handles the care, and together they make video genuinely open to everyone. Description scripts also help sighted students, who use them as study notes that capture exactly what the video showed.
FAQ
How long can a description be?
Roughly twenty words fits a typical short gap at natural narration speed. Longer gaps allow more, but the rule stays the same: finish before dialogue resumes.
Should I describe every visual?
No. Describe visuals that carry meaning for the lesson. Decorative visuals, repeated actions, and obvious context can stay undescribed without loss.
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