# Echo remover: remove echo and reverb from audio

Make voices from big or empty rooms sound close and clear. Noise goes too.

## Why rooms echo

Audo's echo remover works on audio (WAV, MP3, M4A, AAC, FLAC, OGG, Opus, WebM, AIFF) and video (MP4, MOV, MKV, WebM, AVI) up to 100 MB without an account, with the first minute of each file free, 3 times a day, and no sign-up. The first minute usually comes back in about 11 seconds, and a 22-minute recording in about 45 seconds. It rebuilds the voice without the room, and noise goes with the echo. If the room sounds fine and only the background is noisy, Remove noise keeps the voice exactly as recorded.

Echo, also called reverb, is sound bouncing off hard walls, floors, ceilings, and windows, so each word keeps ringing after it's said. Big, bare, or empty rooms ring the most: halls, stairwells, kitchens, bathrooms, and empty offices. The further you are from the mic, the more of the room it hears, and the further away you sound.

Next time, get closer to the mic, record in a room with soft things in it, such as curtains, carpet, a sofa, or clothes, and stay out of bare corners. The examples above are real rooms: a lecture hall, a gallery, and a stairwell.

Tool: Enhance voice (`enhance_voice`). The same tool's other pages: https://audo.ai/audio-enhancer.md, https://audo.ai/audio-cleaner.md, https://audo.ai/voice-cleaner.md. Price: 3 credits a minute — $0.03/min ($1.80/hr), with no subscription — of input for whole files, charged only when a job succeeds.

## Free API

```bash
curl -F file=@lecture.wav https://audo.ai/api/try/enhance-voice -D response.headers -o response.body
```

Read response.headers and response.body before naming media. Handle 202, 200 JSON and errors with the complete response client at https://audo.ai/docs/api#responses.

Free for the first minute of each file, 3 times a day per person, with no key or account. Uploads up to 100 MB, 2 at once from one address. The response is the result itself; a job that runs longer than about 30 seconds returns 202 with a link to check on it. With an API key (`-H "Authorization: Bearer $AUDO_API_KEY"`), omitting free runs the whole file with credits if the balance covers it, otherwise the free portion if quota remains. Set free=true to prohibit spending; for paid whole files use free=false with an approved positive max_credits. A free result cut short comes with finishUrl (and the Audo-Finish-Url header when the response is the file itself): give it to the person, who pays there (from $5, no sign-up), and the whole file runs; keep checking the status link, whose finishedBy names the whole-file job and its own status link. Details: https://audo.ai/docs/api.md

## Options

Form fields with the same names as the MCP tool's inputs:

- `noise_reduction`: How much of the regenerated voice to use, as a percentage. 100 uses all of it; lower values mix back some of the original sound. Default 100.
- `auto_volume`: Sets the whole file to -16 LUFS with one gain, and limits peaks to -1 dBTP. It doesn't balance loud and quiet speakers. Default true.
- `output_format`: The result's format: same (as the input; a video stays a video), wav, mp3, m4a, or flac. Default same.

## Languages

Any language: it works on the sound, not the words.

## From an assistant (MCP)

Add https://audo.ai/mcp and sign in (setup for each assistant: https://audo.ai/setup.md). The tool is `enhance_voice`:

> Regenerates speech: removes echo, noise, and distortion, and restores muffled, phone, or low-quality voices. Then sets the file to -16 LUFS. Made for voices: music and other sounds are removed too. Works on video. Use it for echoey, phone, low-quality, or damaged recordings. Not for plain background noise when the voice is fine (remove_noise keeps the real voice). Set free to true to do the first minute at no cost, up to 3 times a day; otherwise it costs 3 credits a minute, charged only if the job succeeds. Returns job_id; then call get_job.

Example: "Use Audo to remove the echo from lecture.mp3."

## More

- Every tool: https://audo.ai/llms.txt
- OpenAPI: https://audo.ai/api/openapi.json
- This page for people: https://audo.ai/remove-echo