Zoom Recording File Formats Explained: MP4, M4A, M3U, VTT

Zoom saves meeting recordings in six file formats. Its support article on the subject says so in one sentence: "Zoom computer recordings and cloud recordings save in MP4, M4A, M3U, TXT, CC.VTT, and VTT formats."

The sentence right after that one is the part most write-ups drop, and it changes how you should read the list. Zoom writes: "After you have found your computer recordings or viewed your cloud recordings on the web portal, you will see some of the following file formats." Some. Not all six, every time.

The six formats, in Zoom's own words

These definitions are quoted directly from Zoom's recording file formats article.

Zoom's own examples of the default names:

video98796876.mp4
audio98796876.m4a
playback98796876.m3u

Two things worth noticing before you go hunting through a folder.

The MP4 is not named after your meeting. It is named after a random number. A separate Zoom article words the same rule slightly differently — "The audio/video file (MP4) will be named video[number].mp4. The audio-only file (M4A) is named audio[number].m4a" — so the two official pages do not phrase the placeholder identically. Either way, the meeting topic is not in the filename, which is the real reason people conclude a recording "disappeared."

The M3U is not a video. It is a playlist that points at the MP4 files, and Zoom marks it "(Windows only)." Sending someone a .m3u and expecting them to watch your meeting will not work — send the MP4.

What you actually get depends on how you recorded

The two recording destinations do not produce the same set of files.

• Transcripts are cloud-only. Zoom lists "Audio transcription" among the features that "Computer recordings don't support," and states elsewhere that "Audio transcription only applies to cloud recordings, not computer recordings that are saved to your device." So if you recorded to your own machine, no VTT transcript is coming, no matter how long you wait.
• The chat TXT only appears if chat was saved. Zoom's definition is conditional: it "contains in-meeting chat messages that were saved."
• Per-speaker audio is its own set of M4A files. "If recording separate audio tracks for each participant (computer recording only), each participant's audio track will be named audio[Name][random number].m4a by default. For example, audioJohnSmith98796876.m4a." Those land in a subfolder: "Once in the Audio Record folder, each participant's audio track will be listed as its own file."
• The baseline set is smaller than six. Zoom's getting-started page describes both recording types together as providing "standard MP4 video, M4A audio, and chat text files."

One more timing detail that looks like a missing file but isn't: "Once the cloud recording becomes available, the audio transcript may take additional time to process." The VTT shows up after the video does.

Why one meeting can give you three MP4s

This confuses people far more than the format list does, and Zoom documents it identically for both recording types.

"If a participant stops the recording and starts it again, a new video file will be created for the next recording segment. If a participant pauses the recording and starts it again, Zoom will record to the same video file for the recording segment."

The cloud page says the same thing in one line: "Pausing a cloud recording does not create a separate file, but stopping a recording and starting a new cloud recording does create a new file." Pause keeps one file; Stop then Start splits. That is also what the M3U playlist exists to solve.

There is a ceiling on this, too. For cloud recordings, Zoom states: "There is a limit of 150 files that can be generated from a live session's cloud recordings. This includes different recording layouts, audio-only files, chat transcript, and language interpreter views."

The M4A is the file people get stuck on

Zoom is consistent that audio-only output is M4A and never claims anything else — the cloud recording setting reads "Audio files are in the M4A file format." There is no MP3 option anywhere in Zoom's recording documentation. M4A plays fine in most modern players, but plenty of transcription services, podcast hosts and older editors still want MP3, so this is usually the one conversion step people need.

That runs in your browser tab — the file is read from disk, converted locally, and handed back. Nothing is uploaded, which matters for a meeting recording. If you also need the transcript in a different subtitle format, VTT to SRT handles the VTT that Zoom generates for cloud recordings, since Zoom notes "Audio transcripts are saved in VTT format" and that you can open the downloaded file in a text editor.

One caution while files are still being written: renaming a recording mid-conversion is explicitly called out by Zoom as risky, so do your renaming after everything has finished. If you need to convert first, see our walkthrough on turning a Zoom recording into MP4.

Zoom's developer docs list a different set — and contradict themselves

Here is the part nobody covers. Zoom's Meetings API documentation describes the same recording files with a file_type field, and its list of allowed values is not the help centre's list of six:

"MP4", "M4A", "CHAT", "TRANSCRIPT", "CSV", "TB", "CC", "CHAT_MESSAGE", "SUMMARY"

Immediately below that enum, the same page defines the types in prose — and defines one that is not in the enum at all: "TIMELINE - Timestamp file of the recording in JSON file format. To get a timeline file, the Add a timestamp to the recording setting must be enabled in the recording settings." TIMELINE turns up a second time further down, in a rule about missing properties: "A recording file object with file type of either CC or TIMELINE does not have these properties."

Meanwhile TB, which is in the enum, is never explained anywhere in that section. Zoom's documentation does not say what it stands for, and we are not going to guess — check the official documentation if you need it.

The mismatch continues in the file_extension field, whose values are:

"MP4", "M4A", "TXT", "VTT", "CSV", "JSON", "JPG"

JSON and JPG appear here but in none of the six formats the help centre names, and thumbnail shows up in the API's recording_type list. What that means in practice is not documented on the support side, so treat the enum as an enum, not as a promise about what lands in your folder.

The practical lesson: if you are building against the API, the enum is what you can receive; if you are just downloading files from the web portal, the six-format list is what you will see. Neither list is a superset of the other.

FAQ

What file format does Zoom record in? MP4 for audio/video and M4A for audio-only. Zoom's full list is "MP4, M4A, M3U, TXT, CC.VTT, and VTT," but it says you will see "some of the following" — not all six on every recording.

Why is my Zoom recording an M4A instead of an MP4? Because it is the audio-only file. Zoom produces it alongside the video when audio-only recording is switched on, and it defines M4A as the "Audio-only file." The MP4 with the video is a separate file in the same folder.

What is the M3U file in my Zoom folder? A playlist. Zoom calls it a "Playlist file to play all individual MP4 files (Windows only)." It contains no video itself, so it is not the file to share.

Why are there two VTT files? They are different things. CC.VTT is "closed captioning for the cloud recording"; the plain VTT "contains the audio transcription for the cloud recording." They come from two separate cloud recording settings — "Create audio transcript" and "Save closed caption as a VTT file."

Does Zoom export MP3? Not according to its documentation. Zoom only ever names M4A for audio-only recordings. Convert the M4A yourself if you need MP3.

How much disk space will a recording take? Zoom gives a rough figure: "Recording screen sharing uses about 20MB of storage per hour, while recording video uses about 200MB of storage an hour." It immediately adds that "This is an approximation, since the resolution and types of video or screen sharing content can affect the amount of storage used."

Format definitions quoted from Zoom's support documentation and Meetings API reference, checked 16 September 2026. Zoom revises these pages often — verify against the official documentation before relying on them. More walkthroughs in our guides hub, and the full set of browser-based converters is at Clapr tools.