In this guide
Choose boundaries at the start of each part. For many files, Audacity can export labeled sections together; for a few short excerpts, prepare each cut separately. Splitting by time keeps all sounds in each section together.
To split an audio file into parts, decide where each part starts and ends, then export each range as its own file. For many sections, Audacity can use point labels and export multiple files in one operation. For a few short excerpts, a browser trimmer can prepare one range at a time. Keep your original and listen across each boundary.
Choose the right kind of split
| Goal | Starting method | Check |
|---|---|---|
| Several consecutive chapters | Place a point label at each start and export by labels in Audacity. | The first and last sections, names and transitions. |
| Two or three excerpts from a short recording | Prepare each range separately with the browser trimmer. | Each saved file and its source start time. |
| Left and right microphones | Export the existing stereo channels separately. | Both channels are present and each microphone contains the intended sound. |
| Voice and music mixed together | Test source separation rather than cutting by time. | Wanted words, instrument bleed and artifacts in each output. |
Split a long recording into files in Audacity
Audacity's file-splitting instructions use labels to mark the start of each part; its multiple-export manual explains how labels and tracks affect the result. Menu labels can vary with the installed version.
- Import the original. Open the recording and save a separate project or working copy. Listen to locate natural section boundaries, leaving complete words, attacks and tails.
- Add a point label at the first start. Click at the start of the first part, choose Edit → Labels → Add Label at Selection, and enter a useful name. A point label marks a position; a region label spans a range and exports differently.
- Mark each later start. Repeat at the start of every part. With point labels, each exported section runs from one label to the next; the last runs to the end of the audio. Check that the first label covers the beginning you want.
- Export multiple files. Choose File → Export Audio, select Multiple Files and split based on Labels. Choose the destination, file format and naming option, then export. If your first point label is later than the audio start, decide whether to include audio before it.
- Open the actual files. Check the number and names of exports, listen to every beginning and end, and compare the joins with the source. If a word is cut, move the corresponding label and export again.
Multiple export by labels uses the uppermost label track. Other audible tracks above it can be mixed into the files; muted tracks are excluded. The waveform selection does not determine the ranges in this export mode. Review the official export details before using a multitrack project.
Split a short file into parts in your browser
The free audio trimmer accepts a supported mono or stereo MP3 or WAV up to 50 MiB and five minutes. It prepares one continuous excerpt at a time; it does not batch-export a list of cuts. For two sections, set the first start and end, prepare and download it, then set the second range on the original and download that separately.
For example, to divide a 30-second recording at 12 seconds, save 0–12 seconds and then 12–30 seconds. Listen at the boundary: a time chosen in the middle of a syllable or sustained sound may need adjustment. The optional 5 ms edge fades soften abrupt boundaries but alter the edges; turn them off or move the cuts when a transient must remain intact. Keep a note of each source start time if the excerpts will return to video.
WAV or MP3 for the parts?
WAV is useful for a working edit where alignment matters. The browser tool decodes at 48 kHz and writes 16-bit PCM; it does not preserve the original compressed frames or metadata. MP3 is a new lossy encode and can add delay or padding, so compare the actual downloads and check timing if the parts must rejoin seamlessly. A larger WAV does not recover information already lost from an MP3 source. See the MP3 and WAV guide for format tradeoffs.
Common questions
Does splitting a file separate a voice from music?
No. A time split keeps every sound in each selected interval. If they overlap, try the voice isolator and review the requested source against the original. AI downloads use the separate account and credit flow.
How do I split left and right channels?
Use the channel splitter for a supported short stereo file. It makes separate mono channels; each can contain multiple voices or instruments.
Can I reassemble the parts?
Keep their order, original boundaries and source times. WAV is generally more predictable than newly encoded MP3 for timing; listen at each join. The free joiner can arrange supported short files, but check its own limits and do not assume MP3 parts are sample-accurate.