Text to Speech Tools
Text-to-speech tooling: the TTS pipeline and the four factors driving naturalness — text normalisation, pronunciation lexicons, prosody control and post-processing — plus a comparison of concatenative versus neural TTS on stability, cloning and controllability.
TTS turns text into spoken audio, and neural models have improved its quality substantially.
Approach Comparison
| Aspect | Traditional concatenative TTS | Neural TTS |
|---|---|---|
| Synthesis method | Pre-recorded phonemes concatenated | End-to-end acoustic model |
| Naturalness | Audible concatenation artifacts | Close to human speech |
| Prosody | Rule-driven and stiff | Learned jointly from text and audio |
| Voice cloning | Impossible | Possible, given samples |
| Long-text stability | Good, since it concatenates | Can suffer prosody breaks |
| Synthesis speed | Very fast | Slower, depending on model size |
| Controllability | Directly adjustable via rules | Requires prompt engineering |
| Typical use | Clock reading, short numbers | Audiobooks, voice assistants |
Edge Cases
- If text normalisation is not handled, even an excellent model mispronounces numbers, abbreviations and symbols.
- Temperature zero gives reproducible output; above zero it varies per call, so batch generation needs a fixed seed.
- Neural TTS can break prosody across very long passages, requiring sentence-level splitting and concatenation.
- A pronunciation lexicon is what makes proper nouns accurate; without one the model merely guesses.
Common Pitfalls
- Feeding text containing HTML tags or Markdown markers straight to TTS, which then reads the markup aloud.
- Not fixing the random seed during batch generation, so per-batch differences break manual verification.
- Synthesising very long text in one pass, producing prosody breaks and volume drops at the end.
- Ignoring the pronunciation lexicon and mispronouncing proper nouns such as people and brand names.
Related Tools
- Text to SpeechConvert text to speech using the Web Speech Synthesis API. Choose from available voices, adjust speed and pitch. Adjust rate pitch and voice and English text;.
- Image to GIFTurn multiple images into an animated GIF with an adjustable delay, loop count and playback order, from PNG, JPEG or WebP. Preview before you export in one.
- Image Format ConverterConvert images between PNG, JPEG and WebP formats with quality control and white background fill for JPEG transparency and browser compatibility handling.
- Text StatisticsCount characters, words, lines, bytes and estimate reading time with sentence analysis to gauge content length and overall readability at a single glance.