Multi-Speaker TTS & Dialogue Generator
Assign different AI voices to characters, adjust dialogue pauses, and export merged multi-voice audio with SRT subtitles.
100% Private Dialogue Synthesis
Kokoro ONNX & Pocket TTS voice cloning run directly on this device. Zero audio uploaded to cloud servers.
Multi-Speaker TTS & Dialogue Generator Workspace
Assign character voices, tune turn pauses, and generate merged multi-speaker dialogue.
Create realistic multi-voice conversations, podcast exchanges, and audio drama scenes directly in your browser. Assign unique neural voices to different speakers, adjust turn-taking breathing pauses, and export a unified, seamless audio file accompanied by synchronized SRT and WebVTT subtitles.
Why Multi-Speaker TTS? Traditional browser text-to-speech generators only synthesize one voice at a time. If you produce a two-host podcast, an interview video, an educational dialogue, or an indie game scene, you previously had to generate each line individually, download dozens of fragmented audio clips, and manually arrange them in an external timeline editor.
The OfflineTTS Multi-Speaker Studio automates this entire pipeline on your device:
- Automatic Character Parsing: Paste scripts using standard formatting such as `[Alice]: Hello` and `[Bob]: Hi`. Characters are detected automatically.
- Cast Voice Assignment: Pair each character with any of the 54 natural Kokoro voices across female and male timbres, British and American accents, and international styles.
- Natural Dialogue Pacing: Control the silent interval between speakers (100ms to 1500ms) to produce natural conversational turn-taking instead of abrupt transitions.
- Unified Master Export: Receive a single, clean WAV or MP3 audio file with all dialogue stitched in chronological order.
- Synchronized Subtitles: Download matching .srt or .vtt subtitle files with precise cue timestamps and character attribution tags ready for video editing software.
Privacy & Operating Boundary: Dialogue synthesis runs locally in your browser through ONNX Runtime Web. English speech synthesis operates fully on-device after model assets are downloaded into local browser cache. Non-English Kokoro text uses our documented phonemization endpoint before browser-side waveform synthesis. Your audio drafts are never uploaded to a cloud dashboard.
How It Works
Enter Dialogue Script
Type or paste your script with speaker tags (e.g. [Host]: ... and [Guest]: ...), or choose a pre-built template.
Assign Cast Voices
Pick a matching AI voice for each detected character from our library of 54 Kokoro voices.
Tune Pacing & Speed
Set the turn-taking pause (default 400ms) and overall speech rate to match your production tone.
Generate & Export
Synthesize the full dialogue locally, preview playback, and download master WAV, MP3, or SRT subtitles.
Key Capabilities
Character Voice Cast
Assign distinctive male and female neural voices to each speaker in your script.
Natural Turn Pauses
Fine-tune silence duration between speaker turns for realistic conversational rhythm.
Smart Script Parser
Supports bracketed headers, line-by-line dialogues, and interactive block cards.
SRT & VTT Subtitles
Export synchronized subtitle files with speaker tags for Premiere, CapCut, and DaVinci.
Best Practices for Multi-Speaker Dialogue Production
Vocal contrast between characters makes dialogue significantly easier to follow for listeners. When setting up your cast, pair distinct acoustic profiles: for instance, a warm female narrator (Heart) with a deep male voice (Fenrir or Adam), or an expressive host (Bella) with a professional co-host (Michael). Avoid assigning very similar voices to opposing speakers in fast-paced debates.
Natural conversation rarely involves instant speech transitions. A turn-taking pause between 350ms and 500ms typically sounds most natural for general podcast and explainer formats, whereas dramatic audiobooks or tense storytelling scenes often benefit from pauses between 600ms and 900ms. Test a short 2-to-3 line snippet first to dial in the ideal conversational pacing before rendering a long script.
Punctuation, Prosody, and Subtitle Alignment
Neural TTS models derive emotional cadence and breathing pauses from punctuation. Use commas to introduce brief breathing pauses within a character's sentence, ellipses (...) for hesitant or thoughtful deliveries, and em dashes (—) for abrupt interruptions. Punctuation choices directly influence how the model inflects words.
Every generated dialogue export includes synchronized SRT and WebVTT files. Because each speech segment's start and end times are measured directly from the generated audio buffer, subtitle timestamps remain mathematically locked to the audio timeline. You can import the resulting audio and subtitle tracks directly into video editing suites without manual caption retiming.
Related Tools
Text Cleaner
Clean text for TTS, content creation, and data processing
Script Formatter
Format scripts for natural-sounding TTS output
YouTube Voice Generator
Generate browser-based voice-over for YouTube scripts and narration
Audio Joiner
Merge files in order, with optional normalization, crossfades, and gaps
Multi-Speaker TTS & Dialogue Generator — FAQ
Is the multi-speaker TTS generator free?
Yes. Unlike commercial platforms that place multi-speaker dialogue behind paid tiers or token caps, OfflineTTS provides browser-based multi-voice generation completely free with no subscription or character limit.
Do I need to sign up or create an account?
No. The entire multi-speaker studio operates in your browser without requiring account creation, login, or third-party API credentials.
How does the tool distinguish different speakers?
The parser detects lines starting with brackets (e.g., [Alice]: text) or standard colons (e.g., Alice: text). Each unique speaker name is identified as a distinct character and mapped to your chosen voice.
Can I adjust the pause between different characters?
Yes. Use the turn-taking pause slider (100ms to 1500ms) to insert comfortable conversational gaps between speaker lines.
Which audio and subtitle formats can I export?
You can download uncompressed 24kHz 16-bit WAV audio, compressed MP3 audio, SubRip (.srt) subtitles, and WebVTT (.vtt) subtitles with embedded speaker labels.
Can I use generated multi-speaker audio commercially?
Kokoro TTS is an open-weight model licensed under Apache 2.0. Generated audio may generally be used in commercial projects including podcasts, YouTube videos, and indie games, subject to upstream model terms and lawful script rights.
Generate Multi-Speaker Audio Today
Use Kokoro studio voices or clone your own voice with Pocket TTS to produce natural multi-character podcasts, video narration, and audio drama dialogues.