# Audo
> Audo: pro sound without the studio. Audio and video tools for you and your AI assistant: remove noise, enhance voices, transcribe, cut, and more.

## Free, no sign-up
Inspect HTTP status and Content-Type in response.headers before interpreting response.body: 202 is unfinished work, 200 JSON may be a manifest or transcript, and 4xx/5xx is an error. Complete polling and output validation client: https://audo.ai/docs/api#responses

Each tool is free for the first part of a file: one request, no sign-up, a few times a day per tool. For example, noise removal does the first minute free, and convert the first hour. Uploads up to 100 MB, 2 at once from one address.
- Remove noise (the first minute free, then $0.03/min ($1.80/hr), with no subscription with a key): curl -F file=@in.wav https://audo.ai/api/try/remove-noise -D response.headers -o response.body
- Enhance voice (the first minute free, then $0.03/min ($1.80/hr), with no subscription with a key): curl -F file=@in.m4a https://audo.ai/api/try/enhance-voice -D response.headers -o response.body
- Transcribe (the first 2 minutes free, then $0.02/min ($1.20/hr), with no subscription with a key): curl -F file=@in.mp3 https://audo.ai/api/try/transcribe -D response.headers -o response.body
- Align a script (the first 2 minutes free, then $0.02/min ($1.20/hr), with no subscription with a key): curl -F file=@in.mp3 -F script=@script.txt https://audo.ai/api/try/align-script -D response.headers -o response.body
- Cut (the first hour free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in.mp3 -F mode=remove -F 'ranges=[[0,12.5]]' https://audo.ai/api/try/cut -D response.headers -o response.body
- Remove silence (the first hour free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in.wav https://audo.ai/api/try/remove-silence -D response.headers -o response.body
- Set loudness (the first hour free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in.wav https://audo.ai/api/try/loudness -D response.headers -o response.body
- Convert (the first hour free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in.wav https://audo.ai/api/try/convert -D response.headers -o response.body
- Join files (the first hour free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in1.mp3 -F file=@in2.mp3 https://audo.ai/api/try/join -D response.headers -o response.body
- Swap a video's audio (the first hour free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F video=@in.mp4 -F audio=@in.wav https://audo.ai/api/try/swap-audio -D response.headers -o response.body
- Media info (always free): curl -F file=@in.wav https://audo.ai/api/try/media-info -D response.headers -o response.body
- Remove filler words (the first 2 minutes free, then $0.02/min ($1.20/hr), with no subscription with a key): curl -F file=@in.mp3 https://audo.ai/api/try/remove-fillers -D response.headers -o response.body
- Level speakers (the first 3 minutes free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in.wav https://audo.ai/api/try/level-speakers -D response.headers -o response.body
- Mix tracks (the first 3 minutes free, then $0.01/min ($0.60/hr), with no subscription with a key): curl -F file=@in1.wav -F file=@in2.wav https://audo.ai/api/try/mix -D response.headers -o response.body
- Every tool, with its options: https://audo.ai/api/openapi.json
- A free result cut short includes finishUrl: the person pays there (from $5, no sign-up), the whole file runs, and the status link then gives the whole result.
- Out of free uses: the request still takes the file, and its 429 has details.finishUrl: the person pays there (from $5, no sign-up), the whole file runs, and details.statusUrl then gives the whole result.

## Languages
- Transcribe (`transcribe_audio`) and Align a script (`align_script`) and Remove filler words (`remove_fillers`) support 60 languages, detected automatically: af, ar, as, az, bg, bn, bs, ca, cs, da, de, el, en, es, et, fa, fi, fil, fr, gl, gu, he, hi, hu, hy, id, is, it, ja, kk, kn, ko, lt, lv, mk, ml, mr, ms, nb, ne, nl, or, pa, pl, pt, ro, ru, sk, sl, sv, sw, ta, te, th, tr, uk, ur, vi, yue, zh.
- Every other tool works on the sound, so it works in any language.

## Speakers
- Transcribe labels who speaks when (Speaker 1, Speaker 2, and so on) in its JSON, TXT, and VTT, unless `speaker_labels` is false. SRT has no names. Details: https://audo.ai/transcribe.md

## Whole files
- With an API key, omitted free pays for whole files if the balance covers them, otherwise tries the free portion if quota remains. Use free=true to prohibit spending; paid whole-file requests need free=false and an approved positive max_credits. Add -H "Authorization: Bearer $AUDO_API_KEY". Keys, and auto-refill so credits never run out (only the person turns it on): https://audo.ai/keys
- MCP server (sign in; the same free tier, then credits): https://audo.ai/mcp
- Connect an assistant (ChatGPT, Claude, Cowork, Claude Code, Codex, Cursor, Gemini CLI, VS Code, Copilot CLI, Antigravity, Zed, OpenCode, Raycast): https://audo.ai/setup

## Pages
Every tool page on the website, for people, by family as https://audo.ai/all-tools lists them: each tool's page, then the pages for one job under it. Add .md to any of them for its Markdown version.
- Audio enhancer (`enhance_voice`, Clean up): https://audo.ai/audio-enhancer
  - Audio cleaner: clean up any audio recording: https://audo.ai/audio-cleaner
  - Voice cleaner: clean up voice recordings: https://audo.ai/voice-cleaner
- AI noise remover: remove background noise (`remove_noise`, Clean up): https://audo.ai/noise-removal
  - Isolate voice from background noise: https://audo.ai/voice-isolator
  - Remove background music from video: https://audo.ai/remove-music-from-video
  - Remove background noise from video: https://audo.ai/remove-noise-from-video
  - Remove static, hiss, and hum from audio: https://audo.ai/remove-static
- Echo remover: remove echo and reverb from audio (`enhance_voice`, Clean up): https://audo.ai/remove-echo
- Transcribe audio and video to text (`transcribe_audio`, Text): https://audo.ai/transcribe
  - Podcast transcription: transcribe podcasts to text: https://audo.ai/podcast-transcription
  - Create an SRT file from video or audio: https://audo.ai/srt-file-generator
- Text to SRT: sync your script to audio or video (`align_script`, Text): https://audo.ai/text-to-srt
- Remove filler words from audio (`remove_fillers`, Text): https://audo.ai/remove-filler-words
- Online voice recorder (in the browser, Record): https://audo.ai/voice-recorder
- Online audio editor (in the browser, Edit): https://audo.ai/audio-editor
- Audio trimmer: trim and cut audio (`cut_audio`, Edit): https://audo.ai/audio-cutter
- Audio joiner: merge audio files into one (`join_audio`, Edit): https://audo.ai/audio-joiner
- Remove silence from audio (`remove_silence`, Edit): https://audo.ai/silence-remover
- Audio mixer: mix voice and music tracks (`mix_tracks`, Edit): https://audo.ai/mix-audio
  - Replace audio in video: add new sound to a video: https://audo.ai/replace-audio-in-video
- Volume booster: make audio louder (`adjust_loudness`, Volume): https://audo.ai/volume-booster
- Audio leveler: even out loud and quiet voices (`level_speakers`, Volume): https://audo.ai/audio-leveler
- Audio converter: change any file's format (`convert_audio`, Files): https://audo.ai/audio-converter
  - Convert M4A to MP3: https://audo.ai/m4a-to-mp3
  - Convert WAV to MP3: https://audo.ai/wav-to-mp3
  - Convert MP3 to WAV: https://audo.ai/mp3-to-wav
  - Convert MOV to MP3: https://audo.ai/mov-to-mp3
  - Extract audio from video: https://audo.ai/extract-audio-from-video
  - Convert MP4 to WAV: https://audo.ai/mp4-to-wav
  - Convert M4A to WAV: https://audo.ai/m4a-to-wav
  - Convert MP3 to OGG: https://audo.ai/mp3-to-ogg
  - Convert OGG to MP3: https://audo.ai/ogg-to-mp3
  - Compress audio and MP3 files: https://audo.ai/compress-audio
  - Convert FLAC to MP3: https://audo.ai/flac-to-mp3
  - Convert MKV to MP3: https://audo.ai/mkv-to-mp3
  - Convert WebM to MP3: https://audo.ai/webm-to-mp3
  - Convert AAC to MP3: https://audo.ai/aac-to-mp3
- Convert MP4 to MP3 (`convert_audio`, Files): https://audo.ai/mp4-to-mp3
- Media info: check any audio or video file (`analyze_audio`, Files): https://audo.ai/media-info
  - LUFS meter: check how loud your audio is: https://audo.ai/lufs-meter

## More
- All tools, by family: https://audo.ai/all-tools
- Guides and comparisons: https://audo.ai/guides
- About Audo (who it's for and isn't, limits, who makes it): https://audo.ai/about
- Prices and limits: https://audo.ai/pricing
- API docs: https://audo.ai/docs/api
- Markdown version of any page: add .md to its address, such as https://audo.ai/noise-removal.md