Audacity exports what the project plays back, not what the project looks like. A greyed-out track, a hidden part of a clip, or a gain slider pulled to the left all leave the screen looking full and the exported file empty.
That is not a guess about the software. Audacity's manual states the rule directly, and it gives you the one-step test that settles most of these cases in about five seconds.
What Audacity actually writes into the file
The Export Audio Dialog page lists two exclusions, verbatim:
"When using Export Audacity will only export tracks that are not grayed-out by use of the Mute or Solo buttons in the tracks' Track Control Panels."
"Also note that any hidden parts of audio clips are not exported, see Audio Tracks and Clips."
Both are silent failures in the literal sense — nothing errors, nothing warns, and the file that lands on disk is simply missing audio you can still see in the editor.
The same page then gives the rule that makes all of this testable:
"What you hear by previewing with playback prior to export is what you will get in the Exported audio file."
The fastest fix: play the project before you export
Press play and listen to the whole project, not just the part you were working on. This splits your problem in two, and the two halves have completely different fixes:
- Silent (or missing a part) during playback in Audacity too — the cause is in the project. Look at the grey-out state of every Track Control Panel and at the gain sliders, below.
- Sounds correct in Audacity, silent in the exported file — the cause is in the export step: the export range, the format, or the encoder.
Because the second half is where MP3-specific problems live, it is often quicker to settle the question with a lossless export first. Audacity's MP3 page notes that "MP3 files have a short silence at the beginning due to encoder delay. This is a limitation of the MP3 format," and recommends "a format that does not have this limitation, such as WAV, FLAC or Ogg Vorbis" when you need files to line up. Export WAV, confirm it plays, then convert:
Try it right here
Runs in your browser. Your file is not uploaded anywhere.
This runs in your browser tab — the WAV is read from disk and encoded locally, so a large uncompressed export never has to be uploaded anywhere. The WAV to MP3 converter page has the same tool if you want it on its own.
Other causes, in order of likelihood
1. The Gain/Volume slider is pulled to the left
This is the one the manual singles out under quiet or silent exports:
"go back to Audacity and make sure the -....+ Gain/Volume slider on the Track Control Panel (where the mute/solo buttons are) is set centrally at "Gain/Volume: 0 db". If this slider is over to left, it will reduce or kill the volume in the exported MP3."
Note where the manual puts it: on the same panel as the Mute and Solo buttons. If you have been clicking around that area, it is easy to drag the slider without noticing. Check every track, not just the loud one.
2. Export Range treats muted tracks differently
This is the difference almost nobody writes about, and it explains exports that seem to contradict each other on the same project. The two Export Range options are documented with opposite behaviour for greyed-out tracks:
"Entire Project: Choosing this will export the entire project less any tracks that are grayed-out by use of the Mute or Solo buttons in the tracks and are inaudible on playback."
"Current Selection: When choosing this, Audacity will Export the selection from all selected tracks even if some if those tracks are grayed-out by use of the Mute or Solo buttons in the tracks and are inaudible on playback."
So muting a scratch take removes it from an Entire Project export and keeps it in a Current Selection export. If your file is missing a track, you were probably on Entire Project. If your file contains a take you thought you had killed, you were probably on Current Selection.
And you may not have chosen either one deliberately, because the dialog remembers:
"IF you last used Entire Project THEN Entire Project will be offered" "IF you last used Current Selection AND you have a selection active THEN Current Selection will be offered, ELSE Entire Project will be offered,"
Same project, same buttons, different result — because the range carried over from your previous export.
3. The file starts with a long stretch of silence
If the audio is there but the first several seconds are dead, this is the setting to look at:
"If this is unchecked (default setting) when exporting audio any leading blank space offset in the tracks or project to be exported is treated as silence and appropriate leading silence will pad the exported audio."
"If you check this box, leading blank space will be ignored on Export."
The box is Trim blank space before first clip, and it is off by default, so any gap before your first clip becomes padding in the file.
4. The file will not play at all
Different symptom, different cause. For MP3 the manual describes a specific failure: "Sometimes the exported MP3 may be invalid and only a few bytes in size; as a result, it will not play and give an error." Its recommendation is blunt — "The safest solution is to always set your Project Rate to 44100 Hz. Make a rule to check this before you export, because importing a file of some other sample rate may change the Project Rate to that rate."
That last clause is the causal chain worth remembering: importing one oddly-sampled clip can drag the whole project's rate with it, and the export is where you find out.
Two more documented ways to get an unplayable file:
- Custom FFmpeg exports. The manual warns that "not all formats and codecs are compatible, and some exports might result in zero-byte or invalid files if FFmpeg does not support the combination chosen."
- A stopped export. The Stop button "will halt the export where it is now, leaving the partially exported file in place," while Cancel "will abort the export leaving no exported audio file." A truncated file on disk is the signature of Stop.
How to tell it worked
Work down this list before you export again:
- Play the whole project and listen. What you hear is what you get.
- Confirm no Track Control Panel is greyed out unless you meant it to be.
- Confirm every Gain/Volume slider sits centrally at 0 db.
- Check the Export Range selector in the dialog rather than assuming it carried over correctly.
- After export, open the file back up and listen to it end to end — including the last few seconds.
FAQ
Why is my Audacity export silent when the project plays fine? Check the Export Range first. Entire Project drops tracks that are greyed out by Mute or Solo; Current Selection exports selected tracks even when they are greyed out. Then check that the Gain/Volume slider on each Track Control Panel is centred at 0 db, which the manual identifies as a cause of quiet or silent exports.
Why is one track missing from my exported file? Because Audacity "will only export tracks that are not grayed-out by use of the Mute or Solo buttons." Soloing a track to audition it and forgetting to undo it produces exactly this, and there is no warning at export time.
My exported file is shorter than the project. What happened? The manual states that "any hidden parts of audio clips are not exported." Audio that is hidden inside a clip stays visible in the editor but does not reach the file.
Should I export MP3 or WAV from Audacity? Export WAV when anything needs to line up. Audacity's MP3 page states that MP3 files carry "a short silence at the beginning due to encoder delay" as a format limitation, and recommends WAV, FLAC or Ogg Vorbis instead for synchronisation and loops. Convert to MP3 afterwards if you need the smaller file.
Does a silent export mean Audacity is broken? Usually not. All four causes above are documented behaviour, not bugs — which is why they produce no error message. Start from the playback test, since it tells you which half of the workflow to investigate.
Still stuck on a file that exports but will not open where you need it? Browse the rest of the audio and video fixes, or go straight to the full tool list — everything there runs locally in your browser. If you are chasing a similar export problem in a video editor, exporting MP3 from DaVinci Resolve covers that side.
Quotes taken from Audacity's Export Audio Dialog, MP3 Export Options, FAQ: MP3 export problems and Export Formats pages, checked 16 September 2026.
