Text to Speech

Generate speech audio from subtitle text using various TTS engines.

• Menu: Video → Text to speech...
• Shortcut: Configurable

<!-- Screenshot: Text to Speech window -->

How to Use

1. Open Video → Text to speech...
2. Select a TTS engine from the dropdown
3. Select a language and voice
4. Optionally enable Review audio clips to review each generated clip
5. Optionally enable Generate video file to create a video with the audio
6. Click Generate to start

Supported Engines

• Piper — Local, open-source TTS (Windows and Linux)
• EdgeTts — Microsoft Edge online voices
• AllTalk — Local TTS server
• ElevenLabs — Cloud-based, high-quality voices (requires API key)
• AzureSpeech — Microsoft cloud TTS (requires API key and region)
• MistralSpeech — Cloud-based Mistral speech generation (requires API key)
• Murf — Cloud TTS (requires API key)
• GoogleSpeech — Google cloud TTS (requires key file)
• Kokoro TTS — Local downloadable Kokoro TTS server and models
• OmniVoice TTS — Local CPU TTS with voice cloning and many languages
• Qwen3 TTS (CrispASR) — Local Qwen3 TTS running through the CrispASR runtime (VoiceDesign, CustomVoice, and Voice clone 1.7B models)
• Chatterbox TTS (CrispASR) — Chatterbox TTS via the CrispASR runtime, with voice cloning (Base or Turbo model)

Local downloadable engines are installed into the Subtitle Edit data folder when you accept the download prompt.

Engine Settings

Some engines require additional configuration:

• API Key — Enter your API key for cloud-based engines
• Region — Select the Azure region (for Azure engine)
• Model — Select the voice model
• Key file — Browse for Google Cloud service account key file

Local SE5 Engines

Qwen3 TTS (CrispASR)

Qwen3 TTS runs through the CrispASR runtime and shares the CrispASR/models directory with the speech-to-text Crisp ASR engines.

• Available model choices are 1.7B VoiceDesign (uses a free-text voice instruction), 1.7B CustomVoice (nine built-in speakers selected by name), and 1.7B Voice clone (clones an imported reference WAV).
• Subtitle Edit downloads the engine and the selected talker + codec/tokenizer GGUFs on first use.
• Imported reference WAV voices appear in the voice dropdown for the Voice clone model. Each imported voice needs a transcript of what is spoken in the WAV, and the reference audio is resampled to 24 kHz mono (required by the clone model).
• Voice cloning can be slow, especially the first time you synthesize after starting the engine — the model's compute kernels are compiled on first use, so the first clip can take a while (minutes on some machines); subsequent clips are much faster.

Chatterbox TTS (CrispASR)

Chatterbox TTS runs through the CrispASR runtime (shared with the speech-to-text feature) and supports voice cloning.

• Available model choices are Base and Turbo.
• Imported reference WAV voices are sent as the per-request voice for runtime cloning.

Kokoro TTS

Kokoro TTS runs a local server with downloadable models.

• Subtitle Edit downloads the engine and model files when needed.
• Voice names are available immediately from the bundled voice list and can be refreshed from the running server.
• It is a good choice when you want a local, multilingual TTS engine without an API key.

OmniVoice TTS

OmniVoice TTS runs the omnivoice-tts CLI on CPU. It supports a large set of languages and voice cloning from reference WAV files (with an accompanying transcript).

MistralSpeech

MistralSpeech is configured with an API key and model selection. The selected model is remembered in settings.

Review Audio Clips

When Review audio clips is enabled, a dedicated review window opens after generation. This window lets you inspect, play, and regenerate audio for every subtitle line before the result is used. A 120px waveform of the original video audio is shown above the grid as a reference. Per-session review state (clips, history, includes, edits) is persisted to SubtitleEditTts.json so you can return to the same review later.

The Review Grid

Each subtitle line is shown as a row with the following columns:

Column	Description
Include	Checkbox to include or exclude the line from the final output
#	Subtitle line number
Text	The subtitle text (editable — double-click to modify before regenerating)
Voice	The voice used for that line
Speed	The speed factor applied to fit the audio into the subtitle's duration
CPS	Characters per second for the subtitle line

Playback Controls

• Play — Plays the selected line's audio clip
• Stop — Stops playback
• Auto-continue — When enabled, playback automatically advances to the next line as soon as the current clip finishes

Regenerating a Clip

You can regenerate the audio for any individual line:

1. Select the line in the grid
2. Choose the desired engine, voice, language, model, or style from the dropdowns
3. Click Regenerate or press Ctrl+R

The new clip is trimmed for silence and automatically speed-adjusted to fit the subtitle timing. After regeneration the new clip plays back immediately for review.

For ElevenLabs, extra fine-tuning parameters are available when that engine is selected: Stability, Similarity, Speaker Boost, Speed, and Style Exaggeration. A Reset button restores all ElevenLabs parameters to their defaults.

Regeneration History

Every time a clip is regenerated, the previous version is saved. To review the history for a line, click the History button on that row. The history dialog shows all generated versions with their voice name and speed, and lets you play each one. Selecting a version and clicking OK restores it as the active clip for that line.

Including / Excluding Lines

Uncheck the Include checkbox on any row to exclude that line's audio from the final output. Excluded lines are skipped when the video file is assembled.

Exporting Clips

Click Export to save all audio clips and a SubtitleEditTts.json metadata file to a folder of your choice. The JSON file records the audio file names, subtitle timings, voice names, engine names, speed factors, and text for each line, making it easy to re-import or post-process the clips externally.

Keyboard Shortcuts

Key	Action
Ctrl+R	Regenerate selected line
Escape	Close / Cancel
F1	Open help