# Video audio enhancer: fix audio and voice in video

Improve video audio quality and rebuild clear speech with your 4K picture untouched.

Powered by [Audio enhancer](https://audo.ai/audio-enhancer.md) — direct video pass-through with zero picture loss.

## How it works

1. Drop your MP4, MOV, MKV, WebM, or AVI file straight onto the page — no separate WAV export needed.
2. Keep Dialogue polish at Studio to rebuild distant speech, or slide toward Blend original to retain natural room air.
3. Preview the synced video player, then download your original 4K or HD footage with studio-level dialogue.

## Footage where a video audio enhancer saves the shoot

Repair scratch camera audio, screen captures, and phone clips directly on the video container without round-tripping through a desktop video editor.

### iPhone & mirrorless cameras: Enhance voice in video from on-camera scratch mics

Built-in microphones on Sony, Canon, and Nikon bodies or a handheld iPhone sit several feet from the subject, picking up hollow room slap and street rumble when a wireless lavalier fails. Used as a video sound enhancer, Audo rebuilds close-mic warmth on the dialogue track and places it straight back into your original camera file with zero visual generation loss.

### Action cams & outdoor vlogs: Fix audio in video from GoPro, DJI, and travel clips

Waterproof housings on GoPro Hero and DJI Osmo cameras muffle consonants while wind and crowd noise swallow spoken lines. This video audio fixer restores crisp speech intelligibility and levels loudness to −16 LUFS without re-rendering high-bitrate 4K60 footage. When you want to preserve ambient street sound and natural mic tone while only turning wind down, use Remove noise from video.

### OBS, Loom & Zoom MP4s: Clean up video audio in screen recordings and webinars

OBS Studio captures in MKV or MP4, Zoom cloud recordings, and product walkthroughs often pair sharp 1080p or 4K screen share visuals with laptop fan whine, mechanical keyboard clatter, and echoey home offices. Running Audo's video voice enhancer upgrades the presenter's narration in place while keeping every slide transition, cursor movement, and lip-sync frame locked.

### Skip Premiere, Resolve & CapCut: Improve video audio quality without exporting WAVs or Pro gates

Traditional cleanup forces you to bounce a separate WAV and relink tracks in Premiere Pro or DaVinci Resolve, while browser editors add subscription gates — Canva's Enhance Voice requires $15/month Canva Pro (with a 1 GB video cap and 4K uploads downscaled to 1080p) and OpusClip locks Speech enhancement behind its $29/month Pro plan. In Audo, you preview 1 minute free with no sign-up and copy 4K video streams bit-for-bit up to 10 GB — compare Premiere Pro noise reduction and CapCut background noise.

## Bit-for-bit video pass-through with rebuilt studio dialogue

Powered by Audo and its flagship Audio enhancer, this video sound enhancer accepts video containers (MP4, MOV, MKV, WebM, AVI) alongside audio formats (WAV, MP3, M4A, AAC, FLAC, OGG, Opus, AIFF) up to 10 GB as a guest and up to 10 hours signed in, with the first minute of each file free, 3 times a day, with no sign-up. Processing finishes in about 8 seconds for 1 minute, about 38 seconds for 20 minutes, and under 2 minutes (about 1 minute 42 seconds for audio) for a full 1-hour recording.

When you upload a 4K H.264, HEVC, or Apple ProRes file, Audo extracts only the soundtrack, reconstructs clear spoken frequencies while stripping room reflections and mic hiss, normalizes dialogue to −16 LUFS, and copies your original video stream bit-for-bit into the output container. Because zero video frames are decoded or re-compressed, color grading, sharp screen text, and frame rates from 24 fps to 120 fps stay identical to your camera master.

Because voice resynthesis treats non-speech audio as unwanted interference, musical scores and Foley effects are stripped out alongside noise. Choose the right tool for what else sits in your footage: use Remove noise from video to keep natural ambience and original mic character, Remove music from video to strip copyrighted songs while preserving footsteps and effects, or Replace audio in video to lay a fresh soundtrack onto your clip.

Choosing the right Audo tool for your video soundtrack

| Video audio problem | What happens to sound & picture | Best Audo page |
|---|---|---|
| Echoey room, scratch camera mic, or muffled speech | Rebuilds studio voice at −16 LUFS, removes music/SFX, copies 4K/HD video bit-for-bit | Video audio enhancer (this page) |
| Wind, AC hum, or street traffic on an otherwise good mic | Filters noise while keeping natural voice tone and light ambience; copies video untouched | Remove noise from video |
| Copyrighted background music playing behind spoken dialogue | Subtracts music only while keeping voices, footsteps, and scene effects; copies video untouched | Remove music from video |
| Two speakers on camera recorded at mismatched volumes | Matches quiet and loud voices to a steady target without altering mic timbre; copies video untouched | Balance audio (/audio-leveler) |

Tool: Enhance voice (`enhance_voice`). The same tool's other pages: https://audo.ai/audio-enhancer.md, https://audo.ai/remove-echo.md, https://audo.ai/audio-cleaner.md, https://audo.ai/voice-cleaner.md, https://audo.ai/audio-fixer.md, https://audo.ai/fix-muffled-audio.md, https://audo.ai/fix-distorted-audio.md, https://audo.ai/podcast-audio-enhancer.md, https://audo.ai/mic-enhancer.md. Price: 5 credits a minute — $0.05/min ($3.00/hr), pay-as-you-go with no monthly subscription — of input for whole files, charged only when a job succeeds.

## Free API

```bash
curl -F file=@vlog-shoot.mp4 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?utm_source=markdown&utm_medium=agent#responses.

Free for the first minute of each file, 3 times a day per person, with no key or account. Uploads up to 10 GB, 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 full job with credits if the balance covers it, otherwise the free allowance if quota remains. Set free=true to prohibit spending; for paid runs 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). It costs 5 credits a minute, charged only if the job succeeds. Returns the result with download links, or job_id for get_job if it takes longer.

Example: "Use Audo to enhance the spoken dialogue in vlog-shoot.mp4 while keeping the original 4K video untouched."

## Questions

**Is there a free video audio enhancer online without a watermark?** Yes. Audo enhances the first minute of any video for free, 3 times a day, with no sign-up and never adds a visual or audio watermark. Processing whole videos costs $0.05 a minute ($3.00 an hour), paid as you go with no subscription — see pricing.

**How do I fix audio in video without losing 4K or HD video quality?** Upload your MP4, MOV, MKV, WebM, or AVI straight to Audo above, choose your Dialogue polish blend, and download the finished clip. Audo processes only the audio stream and copies your original H.264, HEVC, or ProRes video packets bit-for-bit, so resolution, bitrate, color profile, and frame sync never degrade.

**What happens to background music and sound effects in my video?** They are removed. Because Audo's video audio enhancer reconstructs human speech from the ground up, singing, musical beds, applause, and Foley effects are stripped out. Add background music after enhancing your dialogue in Audo, or use Audo's Remove music from video if you want to strip a song while keeping scene effects and original mic tone.

**When should I pick Video audio enhancer vs. Remove noise from video?** Choose Audo's Video audio enhancer when the voice itself sounds distant, hollow, thin, or echoey — such as an on-camera scratch mic across a room or a booming conference hall. Pick Audo's Remove noise from video when your lavalier or shotgun mic already sounds rich and close, and you only want wind, fan hum, or traffic turned down without resynthesizing the speaker.

**How does Audo compare with Canva Enhance Voice, OpusClip, or desktop video editors?** Canva's Enhance Voice requires a $15/month Canva Pro subscription (with a 1 GB video upload cap and 4K footage downscaled to 1080p), and OpusClip gates Speech enhancement behind its $29/month Pro plan, while desktop NLEs often need separate WAV round-trips. Audo previews 1 minute free with no sign-up, copies original 4K video streams bit-for-bit on uploads up to 10 GB, and also exports WAV, MP3, M4A, or FLAC stems under More options if you want a clean audio track for Premiere Pro or DaVinci Resolve.

**Can I enhance voice in video recorded on an iPhone, GoPro, or OBS?** Yes. iPhone QuickTime MOV clips, GoPro and DJI MP4 chapters, Zoom recordings, and multi-gigabyte OBS MKV captures up to 10 GB upload straight to Audo from Safari, Chrome, or Edge on desktop and mobile. Once the sound is clean, burn styled subtitles onto the clip with Auto captions or crop horizontal footage into 9:16 Shorts using Reframe video.

**Can ChatGPT, Claude, or an AI coding agent fix video sound automatically?** Yes, once Audo is connected over MCP. Drop a video clip into ChatGPT, Claude, Cursor, or Claude Code and ask it to enhance the spoken dialogue while keeping the video stream intact. Add Audo to your assistant one time and every chat can clean video soundtracks on demand.

## More

- Every tool: https://audo.ai/llms.txt
- OpenAPI: https://audo.ai/api/openapi.json
- This page for people: https://audo.ai/video-audio-enhancer?utm_source=markdown&utm_medium=agent