Media info: check any audio or video file
See a file's real format, length, bitrate, and more. Always free.
10M+ files processed since 2021
More options
Free for whole files, 20 a day. No sign-up.
How to check an audio file
- 1
Add an audio or video file.
- 2
Audo checks it for you.
- 3
Read the report, or download it.
What's really in a file
Audo's Media info tool reads 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 whole files always free, 20 a day, and no sign-up. A 2-minute file is usually checked in about 3 seconds.
A file's name doesn't always say what's inside. An .mp4 might hold only sound, a WAV might be 24-bit, and a file you thought was stereo might be mono. The report reads the file itself: its real format, the kind of sound inside, its kHz, channels, bitrate, and length.
Then it measures how the file sounds, in the terms podcast hosts, streaming services, and audiobook publishers use. Run it before you publish, and again after another tool to see what changed: the report never changes your file. It lists the first 50 silent stretches, or every one if you pick All of them under More options.
Questions
How do I know if my MP3 is 320 kbps?
Add it at the top of this page: the report's Audio line shows the bitrate of any audio file, such as 320 kbps. That's the bitrate it was saved at, so it can't tell whether the MP3 was made from a lower-quality copy.
What does the report show?
The length, format, and size, and the sound inside, such as AAC, 48 kHz, stereo, 128 kbps, with a video's picture size and frame rate. Then how it sounds: loudness, the loudest peak, how far apart the loud and soft parts are, average level, noise floor, clipped samples, and pauses of 0.7 seconds or more.
Can it tell if a video has sound?
Yes. A video with no sound at all shows none on the report's Audio line. One with sound shows what kind it is, next to the picture's details.
What do the numbers mean?
Loudness is how loud the file sounds overall: podcasts aim for about −16. The noise floor is the level of hiss or hum when nobody's talking, and lower is quieter. Audiobook publishers such as ACX want it at −60 dB or below.
What is clipping?
Sound that hit the very top of what the file can hold, so its peaks were cut flat. It sounds like crackle or harsh distortion. The report counts clipped samples, so you know whether to listen for it.
Is there a free way to check a file online?
Yes. Audo checks whole files for free, up to 20 a day, with no sign-up, on a computer or in a phone's browser.
Can ChatGPT analyze audio?
Yes, with Audo added to it. Attach a recording and ask what's in it, and ChatGPT gets this same report, so it can tell you the format, length, loudness, peaks, and long silences. Claude works the same way. Add Audo to your assistant once, and it's there in every chat.
What happens to my files?
They stay private. Files are deleted after 24 hours, and free results after 1 hour.
More tools
- Convert audioAudio to MP3, WAV and more.
- MP4 to MP3Get the sound from any video.
- Audio enhancerMake any recording sound studio‑quality.
- Remove noiseClears the background, keeps your voice.
- Remove echoMake voices sound close.
- Transcribe audioSpeech to text, who said what.
- Text to SRTSync a script to audio.
- Remove filler wordsCut the ums and uhs.
- Voice recorderRecord, then trim and clean up.
- Screen recorderRecord screen, camera, and sound.
For AI assistants and developers
Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code. When an agent's free result is cut short, it gives you a link to finish the whole file, no sign-up.
Show the free API call
curl -F file=@interview.wav https://audo.ai/api/try/media-info -D response.headers -o response.body