TTSForFree

Name: TTSForFree
Author: CalmNguyen

Server Details

Generate AI voices, text-to-speech, subtitles, transcription, and video localization.

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Status: Healthy
Last Tested: 2026-10-22 19:26
Transport: Streamable HTTP · MCP 2025-11-25
URL
Repository: CalmNguyen/ttsforfree-mcp
GitHub Stars: 0

TDQS

Score is being calculated.

Available Tools

21 tools

add_favorite_voiceAdd favorite voice

Idempotent

Inspect

Save a voice to the user's favorites (only when the user asks).

ParametersJSON Schema

Name	Required	Description	Default
`voice`	Yes	Voice token (v1:...) from list_voices.

create_upload_urlUpload a video/audio fileInspect

Get a one-time URL to upload a local video or audio file (mp4, mov, webm, mkv, mp3, wav, m4a...) up to 2 GB. Upload with HTTP PUT of the raw bytes, e.g. curl -T video.mp4 "<upload_url>" (valid 15 minutes), then pass public_url to transcribe_media or localize_video. Only files uploaded here (or on ttsforfree.com) are accepted; YouTube and other external links are never downloaded. If you cannot run commands, ask the user to upload the file on https://ttsforfree.com/en/video-localization/ and paste the file link.

ParametersJSON Schema

Name	Required	Description	Default
`file_name`	Yes	Original file name with extension, e.g. lesson-01.mp4
`file_size_bytes`	No

design_custom_voiceDesign a custom voiceInspect

Create a new personal AI voice from a natural-language description (Gemini Voice Design). Uses one slot of the user's custom-voice quota - confirm with the user first. Good for a unique narrator or a character voice in a video/podcast. Returns the new voice token.

ParametersJSON Schema

Name	Required	Description
`gender`	Yes
`prompt`	Yes	Describe age, accent, timbre, personality, energy and pace. Example: 'Calm male documentary narrator in his 40s, deep warm timbre, slow confident pace, neutral American accent.'
`display_name`	Yes
`language_code`	Yes	BCP-47 locale, e.g. en-US, vi-VN.

estimate_video_localizationEstimate video dubbing cost

Read-onlyIdempotent

Inspect

Estimate the credits to dub one video into one or more languages (speech-to-text + translation + voice + video merge) before running localize_video. Pass video_url (duration is measured) or duration_seconds.

ParametersJSON Schema

Name	Required	Description
`targets`	Yes	One entry per target language (the server allows 10 per job by default).
`video_url`	No
`source_language`	Yes
`duration_seconds`	No

get_account_statusAccount status

Read-only

Inspect

Show the user's plan tier, remaining characters/credits, max characters per request, max blocks per multi-voice/SRT job and API rate limits. Call before large jobs.

ParametersJSON Schema

Name	Required	Description	Default
No parameters

get_job_detailJob segments (for Remotion / editors)

Read-onlyIdempotent

Inspect

Get a multi_voice_to_speech or srt_to_speech job with every segment: text, voice and its own audio_url, plus the merged audio. Use it to build captions or a Remotion/NLE timeline (one per segment; measure each file's duration in the renderer).

ParametersJSON Schema

Name	Required	Description	Default
`job_id`	Yes

get_job_statusJob status

Read-onlyIdempotent

Inspect

Check a speech job created earlier. Returns status (PENDING | SUCCESS | ERROR) and audio_url once SUCCESS. Never guess or fetch an audio URL before SUCCESS.

ParametersJSON Schema

Name	Required	Description
`job_id`	Yes
`job_type`	Yes	single = text_to_speech, multi = multi_voice_to_speech, srt = srt_to_speech.
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.

get_localization_statusVideo dubbing status

Read-onlyIdempotent

Inspect

Status of localize_video jobs: current step, and when Completed the dubbed audio_url, final_video_url and translated SRT for each language.

ParametersJSON Schema

Name	Required	Description	Default
`job_guids`	Yes
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.

get_transcriptionTranscription status

Read-onlyIdempotent

Inspect

Check a transcribe_media job and get its SRT once finished.

ParametersJSON Schema

Name	Required	Description	Default
`job_id`	Yes
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.

get_voice_detailsVoice details

Read-onlyIdempotent

Inspect

Get full metadata for one voice token: persona, use case, accent, pitch, styles, preview audio and credit cost.

ParametersJSON Schema

Name	Required	Description	Default
`voice`	Yes	Voice token (v1:...) from list_voices, favorites or custom voices.

list_favorite_voicesMy favorite voices

Read-onlyIdempotent

Inspect

List the voices the user marked as favorites, in their saved order. Check this first when the user did not name a voice.

ParametersJSON Schema

Name	Required	Description	Default
No parameters

list_languagesList languages

Read-onlyIdempotent

Inspect

List every language supported by TTSForFree text-to-speech. Returns language codes to pass to list_voices.

ParametersJSON Schema

Name	Required	Description	Default
No parameters

list_my_custom_voicesMy custom voices

Read-onlyIdempotent

Inspect

List the user's personal voices created with Voice Design (from a text prompt) or Voice Clone (from an audio sample), plus the remaining custom-voice quota. Use voice from the result in any speech tool.

ParametersJSON Schema

Name	Required	Description	Default
No parameters

list_recent_jobsRecent jobs

Read-onlyIdempotent

Inspect

List the user's most recent speech jobs with status and audio URLs, to reuse earlier audio instead of paying again.

ParametersJSON Schema

Name	Required	Description	Default
`limit`	No
`job_type`	No		single

list_voicesFind voices

Read-onlyIdempotent

Inspect

Search the AI voice catalog for one language. Each result has a voice token (v1:...) - pass it unchanged as voice to text_to_speech, multi_voice_to_speech or srt_to_speech. Results are sorted by popularity; can_use=false means the user's plan cannot use that voice. Prefer the user's favorite or custom voices when they exist.

ParametersJSON Schema

Name	Required	Description
`limit`	No
`query`	No	Optional keywords matched against name, style, persona and use case, e.g. 'warm narrator', 'news', 'young'.
`gender`	No
`language`	Yes	Language code from list_languages, e.g. en, vi, es, ja.
`provider`	No	Optional voice engine filter. Gemini/OpenAI voices are the most expressive.
`only_usable`	No	Hide voices the current plan cannot use.

localize_videoDub a video into other languagesInspect

Full automatic dubbing of an uploaded video: transcribe once, translate, voice every target language with its own voice and render a dubbed video per language. Each language returns an audio_url (voice track aligned to the original timeline - upload it to YouTube Studio as a multi-language audio track) and a final_video_url. Takes several minutes: returns job_guids immediately; poll get_localization_status. Confirm the cost with estimate_video_localization for long videos.

ParametersJSON Schema

Name	Required	Description
`targets`	Yes	One entry per target language (the server allows 10 per job by default).
`video_url`	Yes	public_url from create_upload_url.
`source_language`	Yes	Spoken language of the video, e.g. vi.
`original_audio_volume_percent`	No	Keep the original sound (music/effects) under the new voice at this volume in the dubbed video. 0 = remove.

multi_voice_to_speechMulti-voice audio (podcast / dialogue)Inspect

Render ordered segments, each with its own voice, into ONE merged MP3. Use for podcasts, dialogues, interviews, audio dramas or explainer videos with several speakers when there are no fixed timestamps. Consumes credits.

ParametersJSON Schema

Name	Required	Description	Default
`segments`	Yes
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.

remove_favorite_voiceRemove favorite voice

DestructiveIdempotent

Inspect

Remove a voice from the user's favorites (only when the user asks).

ParametersJSON Schema

Name	Required	Description	Default
`voice`	Yes	Voice token (v1:...) from list_favorite_voices.

srt_to_speechSubtitles to speech (video voiceover / dubbing)Inspect

Create ONE MP3 that follows a subtitle timeline: every cue starts at its timestamp and speech speed auto-fits the cue duration. Use for video voiceover, dubbing translated subtitles, YouTube localization, tutorials and any edit where audio must line up with existing video. Pass either raw srt (SRT or WebVTT text) or segments with start_ms/end_ms. For several speakers set speaker_voices and prefix cue text with '[Name]' or 'Name:'. The resulting MP3 starts at 00:00 of the video, so it can be muxed directly with ffmpeg (commands are returned). Consumes credits.

ParametersJSON Schema

Name	Required	Description
`srt`	No	Full SRT or WebVTT content.
`voice`	No	Default voice token for cues without a speaker/voice.
`segments`	No	Alternative to srt: timed segments.
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.
`speaker_voices`	No	Map speaker name -> voice token, e.g. {"Host": "v1:...", "Guest": "v1:..."}.
`max_speech_rate`	No	Highest auto-fit speed when a cue is too short for its text.
`min_speech_rate`	No	Lowest auto-fit speed. Set min = max for a fixed speed.

text_to_speechText to speechInspect

Convert one text into one MP3 with one voice. Use for narration, voiceover scripts, articles, lessons, announcements or any audio whose length can follow the speech. Consumes credits (characters x voice rate). Returns job_id, status and audio_url when ready.

ParametersJSON Schema

Name	Required	Description
`text`	Yes	Text to read. Plain text; long text is split and merged automatically.
`pitch`	No	Only some providers support pitch.
`voice`	Yes	Voice token (v1:...).
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.

transcribe_mediaTranscribe video/audio to SRTInspect

Speech-to-text for an uploaded video or audio file: returns timestamped SRT (the timeline to rewrite, translate or re-voice with srt_to_speech). Credits are charged per second of media, measured by the server. Use language = the spoken language code from list_languages.

ParametersJSON Schema

Name	Required	Description
`language`	Yes	Spoken language code, e.g. vi, en, ja.
`media_url`	Yes	public_url from create_upload_url (or a ttsforfree CDN link).
`wait_seconds`	No	Seconds the server waits for the audio before returning. If the job is still PENDING, call get_job_status later with the returned job_id.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

21 tool updatesOct 22, 2026
- First observedadd_favorite_voice
- First observedcreate_upload_url
- First observeddesign_custom_voice
- First observedestimate_video_localization
- First observedget_account_status
- First observedget_job_detail
- First observedget_job_status
- First observedget_localization_status
- First observedget_transcription
- First observedget_voice_details
- First observedlist_favorite_voices
- First observedlist_languages
- First observedlist_my_custom_voices
- First observedlist_recent_jobs
- First observedlist_voices
- First observedlocalize_video
- First observedmulti_voice_to_speech
- First observedremove_favorite_voice
- First observedsrt_to_speech
- First observedtext_to_speech
- First observedtranscribe_media

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