Long-form Audiobook AI - 50,000 Chars per Job
AI audiobook production: submit up to 50,000 characters at once, auto-chunked by paragraph, generated with context for seamless continuity, merged into one audio file with a full subtitle track.
Last updated: 2026-08-23
The hard part of long text isn't "long"
Anyone can split 10,000 words into pieces and generate each one. The hard part is making the seams inaudible: intonation must not reset, and the tone at the end of one chunk has to carry into the next. Long-form mode sends each chunk to the model together with its neighbors as context, so transitions stay continuous.
Real sample: three paragraphs, one file
A 197-character fiction excerpt, split into 3 paragraphs by blank lines, narrated by a Mandarin broadcast voice and merged into one 49.7-second file:
深夜十一点,林夏终于合上了最后一页实验记录。……
(11 p.m. Lin Xia finally closed the last page of the lab notes…)
电话在这时响起。……
(That's when the phone rang…)
林夏放下电话,从抽屉深处取出那枚芯片。……
(She hung up and took the chip from the back of the drawer…)
Listen for the transition from paragraph one to two — that's a chunk boundary, and the delivery doesn't reset.
What long-form mode does
- Auto-chunking: splits on blank lines, then on sentence ends for oversized paragraphs, keeping every chunk under 2,500 characters
- Context continuity: each chunk is generated with the previous and next text, so intonation carries over
- Merged output: all chunks concatenated into one MP3; character timestamps shifted by cumulative duration into one subtitle track spanning the whole text
- One charge: credits computed per chunk and shown before you generate; if any chunk fails, the whole job refunds
What it's for
- Audiobooks & web novels: submit whole chapters, narrated by a library anchor voice or your cloned narrator
- Lecture scripts: one file per lesson with full subtitles; edit one paragraph, regenerate just that part
- Podcast scripts: write, generate, publish — no booth
- Multilingual long content: generate each translated version with a native voice for that language
How to use it
Voice Studio → Long-form: paste up to 50,000 characters; the page shows how many chunks and how many credits in real time. Pick a voice and model (expand advanced settings for stability and speed), then generate. Roughly 1–2 minutes per 10,000 characters. Download the audio and the full SRT from the history panel when done.