Novolis.Audio.Voice.EdgeTts 2026.1.10.104

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Novolis.Audio.Voice.EdgeTts

Novolis.Audio.Voice.EdgeTts uses Microsoft's consumer Edge Read Aloud service through an unofficial protocol. It is not the Azure Speech SDK and has no Microsoft compatibility or availability guarantee.

Online TTS client for Microsoft Edge Read Aloud — the same service used by edge-tts. Returns MP3 directly. No Edge browser or Windows install required.

Important

• Network access is required (HTTPS + WSS to Microsoft).
• Submitted text is sent to Microsoft for synthesis.
• Microsoft may change, rate-limit, or restrict the service at any time.
• Do not treat this package as a sole availability-critical TTS provider. Prefer offline engines (Kokoro, SherpaOnnx) or user-owned AzureSpeech when uptime matters.
• Handshake uses Sec-MS-GEC v2 (same as current edge-tts / Edge Read Aloud). Microsoft may change it again without notice.
• This package is intentionally outside the PCM IVoiceSynthesizer pipeline.

License

LGPL-3.0-only — derived from / translated from rany2/edge-tts. See THIRD-PARTY-NOTICES.md and LICENSES/LGPL-3.0.txt in the NuGet package.

Other Novolis Audio packages retain their own licenses (typically MIT).

Install

dotnet add package Novolis.Audio.Voice.EdgeTts

Prerequisites: .NET 10 SDK (net10.0).

Quick start

using Novolis.Audio.Voice.EdgeTts;

using var tts = new EdgeTtsClient(
    new EdgeTtsClientOptions
    {
        ConnectTimeout = TimeSpan.FromSeconds(10),
        ReceiveTimeout = TimeSpan.FromSeconds(60),
    });

// Stream MP3 as it arrives (preferred):
await using var file = File.Create("hello.mp3");
await tts.SynthesizeAsync(
    "Tower, ready for departure.",
    file,
    new EdgeTtsSynthesisOptions
    {
        Voice = EdgeVoice.EnUsAva,
        Rate = new ProsodyPercent(-4),
        Volume = ProsodyPercent.Zero,
        Pitch = ProsodyHertz.Zero,
    });

// Or buffer in memory:
var mp3 = await tts.SynthesizeToMp3Async("Hello.");

Curated voices and profiles

• EdgeVoice / EdgeVoiceCatalog — closed set for dropdowns (Ava, Jenny, Andrew, …)
• EdgeVoiceProfiles.Narrator — book defaults (Ava, −4% rate)
• ProsodyPercent / ProsodyHertz — typed prosody (no "+0%" strings on the public API)
• EdgeTtsClientOptions — connect/receive timeouts (transport); EdgeTtsSynthesisOptions — voice/prosody only

Notes

• Output format is audio-24khz-48kbitrate-mono-mp3.
• Cross-platform (net10.0).
• Not wired into IVoiceSynthesizer (that expects PCM). Use this when you want MP3 from Edge Read Aloud directly.

Related packages

Support

Pre-release (2026.1.* on GitHub Packages).