# OfflineTTS > Private, offline AI audio tools in your browser. Free text-to-speech (54 voices, 9 languages, plus Pocket TTS voice cloning), speech-to-text (Whisper, 99 languages), subtitle generation, ebook-to-audio conversion, and creator voice-over workflows. No API keys, no signup, no data leaves your device. ## Core Tools - Free Text to Speech Online: https://offlinetts.com/app/ - Kokoro TTS (54 voices, 9 languages): https://offlinetts.com/app/ - Kitten TTS (8 voices, lightweight): https://offlinetts.com/app/kitten/ - Piper TTS (26 voices, CPU-friendly): https://offlinetts.com/app/piper/ - Supertonic TTS (31 languages): https://offlinetts.com/app/supertonic/ - Pocket TTS (8 voices, voice cloning): https://offlinetts.com/app/pocket/ - Whisper Speech to Text (99 languages): https://offlinetts.com/app/stt/ ## Creator Workflows - Creator Voice Generator (YouTube, Shorts, TikTok, Reels, and faceless narration): https://offlinetts.com/tools/youtube-voice-generator/ - Creator Media Transcription and Subtitles: https://offlinetts.com/tools/audio-to-text/ ## Document & Ebook Tools - Ebook and Document to Audio (EPUB/PDF/TXT): https://offlinetts.com/tools/ebook-to-audio/ ## Transcript & Subtitle Tools - Audio to Text: https://offlinetts.com/tools/audio-to-text/ - Transcript and Subtitle Export (TXT/SRT/VTT): https://offlinetts.com/tools/audio-to-text/ - Subtitle Cleaner: https://offlinetts.com/tools/subtitle-cleaner/ ## Text Preparation Tools - Text Cleaner: https://offlinetts.com/tools/text-cleaner/ - Punctuation Fixer: https://offlinetts.com/tools/punctuation-enhancer/ - Script Formatter: https://offlinetts.com/tools/script-formatter/ ## Audio Editing & Voiceover Tools - Voiceover & Audio Studio: https://offlinetts.com/tools/ - Audio Equalizer (10-Band EQ & Spectrum View): https://offlinetts.com/tools/audio-equalizer/ - Audio Trimmer & Cutter: https://offlinetts.com/tools/audio-trimmer/ - Volume Booster & Normalizer: https://offlinetts.com/tools/volume-booster/ - Voice Noise Remover (Spectral Denoise): https://offlinetts.com/tools/noise-remover/ - Voice Changer (16 Character Presets): https://offlinetts.com/tools/voice-changer/ - Tempo Changer (Speed Up/Slow Down without Pitch Shift): https://offlinetts.com/tools/tempo-changer/ - Pitch Shifter (Transpose Audio +/- 12 Semitones): https://offlinetts.com/tools/pitch-shifter/ - Add Reverb to Audio (Studio, Hall, Plate Reverb): https://offlinetts.com/tools/add-reverb-to-audio/ - Bass Booster: https://offlinetts.com/tools/bass-boost/ - Audio Joiner: https://offlinetts.com/tools/audio-joiner/ - Audio Converter (WAV/MP3 Sample Rate & Channels): https://offlinetts.com/tools/audio-converter/ - BPM & Key Finder (Tempo, Musical Key, Camelot Code, Tuning): https://offlinetts.com/tools/audio-analyzer/ - Online Tone Generator (Calibration Sine & Sweeps): https://offlinetts.com/tools/tone-generator/ - Silence Trimmer: https://offlinetts.com/tools/audio-trimmer-lab/ - Slowed + Reverb Maker: https://offlinetts.com/tools/slowed-reverb/ - Nightcore Maker: https://offlinetts.com/tools/nightcore/ - Sped Up Song Maker: https://offlinetts.com/tools/sped-up/ - Vaporwave Maker: https://offlinetts.com/tools/vaporwave/ - 8D Audio Maker: https://offlinetts.com/tools/8d-audio/ - Reverse Audio: https://offlinetts.com/tools/reverse-audio/ ## Voice Database - All 54 Voices: https://offlinetts.com/voice/ - Female Voices: https://offlinetts.com/tts/female-voice/ - Male Voices: https://offlinetts.com/tts/male-voice/ - Deep Male Voices: https://offlinetts.com/tts/deep-male-voice/ - AI Voice Maker (design or clone your own voice): https://offlinetts.com/voice-maker/ - Voice Cloner (record or upload, on-device cloning): https://offlinetts.com/voice-maker/clone/ - Voice Packs (13 curated blend recipes): https://offlinetts.com/voice-maker/packs/ ## TTS by Language - English TTS: https://offlinetts.com/tts/english/ - Chinese TTS: https://offlinetts.com/tts/chinese/ - Japanese TTS: https://offlinetts.com/tts/japanese/ - Spanish TTS: https://offlinetts.com/tts/spanish/ - French TTS: https://offlinetts.com/tts/french/ - Hindi TTS: https://offlinetts.com/tts/hindi/ ## TTS by Use Case - YouTube Narration: https://offlinetts.com/tts/youtube/ - TikTok Shorts & Reels: https://offlinetts.com/tts/tiktok-shorts-reels/ - Audiobook Narration: https://offlinetts.com/tts/audiobook/ - Podcast Production: https://offlinetts.com/tts/podcast/ - E-Learning Voice: https://offlinetts.com/tts/elearning/ - Accessibility Tools: https://offlinetts.com/tts/accessibility/ - Storytelling & Narration: https://offlinetts.com/tts/storytelling-narration/ ## Key Features - Audio inference runs locally; non-English Kokoro text uses api.offlinetts.com for phonemization. Model downloads, hosting, and opted-in services have separate network paths. - Free: no usage limits, no signup, no API keys - Offline capable: English TTS works offline after model download - 5 TTS engines: Kokoro (best quality), Kitten (lightest), Piper (fastest CPU), Supertonic (most languages), Pocket TTS (voice cloning) - Multiple audio formats: WAV and MP3 download - Model sizes: Small (~90MB), Medium (~300MB), Large (~600MB) - STT: Whisper-based, 99 languages, word timestamps, SRT/VTT export ## Technical Details - Built with Astro, Tailwind CSS v4 - Browser inference via ONNX Runtime Web (WebGPU/WASM) - Deployed on Cloudflare Pages - Models cached in IndexedDB for offline use - Application ownership: Proprietary. Upstream models and runtimes retain their own licenses. ## Product Comparisons & Buying Guides - ElevenLabs Features & Pricing Guide (Starter, Creator, Voice Cloning, Studio, Music, Dubbing, and ElevenAgents): https://offlinetts.com/blog/elevenlabs-features-pricing-guide-2026/ - OfflineTTS vs ElevenLabs: https://offlinetts.com/blog/offlinetts-vs-elevenlabs/