Subtitle Generator - Timings That Line Up
Subtitle generator for audio and video: SRT timings are measured per word during transcription, not estimated afterwards, so they align with no second pass.
最終更新: 2026-10-18
Subtitles drift because the timings were guessed
The usual subtitle generator recognises the words, then distributes the time evenly across them based on speaking rate. Real speech has pauses, held vowels and filler — so even distribution drifts. The first half of a line disappears early; the second half arrives half a second late.
This subtitle generator does not distribute anything. Timings are measured per word during transcription, to 0.01 seconds.
How precise that actually is
Real word timings from a Mandarin storytelling clip:
The hard part of subtitles is timing: two speakers alternating, pauses between lines, and every cue has to land on the exact in and out point. Listen to this exchange, then see how the transcript splits into cues:
上[0.42→0.72] 回[0.72→0.88] 书[0.88→1.06] 说[1.06→1.48]
到[1.48→1.84] ，[1.84→2.62] 那[2.62→2.96] 少[2.96→3.18]
年[3.18→3.40] 提[3.40→3.64] 剑[3.64→3.96] 立[3.96→4.22]
Look at the sixth entry — the comma. It occupies 0.78 seconds, longer than any word before it. That is the storyteller's pause.
Distribute time evenly and those 0.78 seconds get smeared across the surrounding words, and every cue after that point drifts. Measured timings record the pause as it happened, so everything downstream stays put. That is the quickest test of any subtitle generator: are the cues after a long pause still on time?
Before you use a subtitle generator, pick the right path
| Where your audio came from | Path | Why |
|---|---|---|
| Generated here | Use the caption track from synthesis | Timings are exact — synthesis knows when each word is emitted |
| Recordings, outside material | Upload and transcribe, export SRT | Timings are measured by recognition, word level |
The first row is easy to miss: if the voiceover was generated here, do not run recognition over it. That swaps exact values for estimated ones and can add transcription errors on top. The caption track already exists.
Correcting words never moves the timings
Recognition is never perfect — homophones are a hard limit. But the words and the timings are two separate pieces of data.
Fix a word in the text and its start and end times are unchanged. So the right proofreading order is bulk-correct the text, then export the SRT — not click through cues one at a time inside an editor.
That is the practical difference between this subtitle generator and editor auto-captions, where text and timing are welded together.
Why the output is SRT
SRT is the most widely supported subtitle format: a plain-text file in which every cue is a number, a start and end time, and the text. CapCut, Premiere and Final Cut import it directly, and any text editor can open it.
The exported SRT splits on sentence boundaries. If a cue is still too long, the word-level timings let you split it at any word and read off the exact seconds instead of guessing.
How to use the subtitle generator
- Open the voice studio → transcribe
- Upload audio or video (200MB total per upload)
- Read it through, concentrating on names, jargon and code-switching
- Export the SRT and drop it into CapCut, Premiere or Final Cut
One ordering trap: lock the edit before transcribing. Re-cutting afterwards leaves the timings misaligned against the new picture.
Four common subtitle mistakes
- Re-cutting after transcribing. Remove or move a shot and every later cue shifts. Lock the edit first.
- Fixing typos cue by cue in the editor. Correct the transcript in bulk, then export — one pass is enough.
- Transcribing your own generated voiceover. The synthesis track is exact; recognition can only make it worse.
- Cramming a long sentence into one cue. Split it on a word boundary so viewers can keep up and the timing stays true.
Want a transcript rather than captions? Audio files: MP3 to text. Video files: MP4 to text.
FAQ
How is this subtitle generator different from the auto-captions in my editor? An editor re-transcribes the finished cut, and the text and timings are locked together inside the software, so every correction is a separate click. Here the SRT comes from the same pass as the transcript: fix the words in bulk, then export, and the timings are untouched. Audio generated here skips recognition entirely — the timings were computed at synthesis.
How precise are the timings? Word level, to 0.01 seconds. That means line breaks land on word boundaries rather than an estimated midpoint, so splitting a long line in two never makes the first half vanish early or the second half arrive late.
Can long lines be broken automatically? The exported SRT splits on sentence boundaries. If a cue is still too long, the word-level timings let you split at any word and read off the exact start and end seconds rather than estimating them.
If I use your voice generation, do I still need to transcribe? No, and you should not. Synthesis emits a word-level caption track directly, and those timings are exact. Running recognition over the result replaces exact values with estimated ones and can introduce transcription errors. Use the track produced at synthesis.
Start here
Cost: 20 credits per file (up to 200MB per upload), refunded automatically if it fails. The $3.90 trial pack has 150 credits, enough for 7 files, and they never expire.
Put a locked cut through the subtitle generator, drop the SRT into your editor, and check whether it needs any alignment at all.
Upload material and generate subtitles →
Related: MP4 to text · MP3 to text · meeting transcription · subtitle timing guide