- Practice and study. Break a rehearsal take or a short lesson into minute-long parts you can repeat one at a time.
Audio File Splitter: Split Audio Into Parts by Length
Choose an MP3 or WAV, set how many seconds each part should last, and split it into ordered WAV parts. The last part keeps whatever time is left over. Splitting runs in your browser.
Splitting runs in your browser. MP3 or WAV, up to 30 MB and 10 minutes. Up to 60 parts, downloaded as WAV files.
YOUR WORKSPACEMP3 / WAV → WAV
Drop your audio here
Or choose a file to start making your cut.
MP3 or WAV · Up to 30 MB · 10 minutes maxYour audio stays on your device.No account. No upload.
Example: Split a 3:42 recording
60 seconds per part leaves a final 42-second clip.
- One recording
- 60-second parts
- Four WAV files
File, length and part limits
Check these before you choose a file.
- File types: MP3 or WAV, mono or stereo. Whether a file opens also depends on your browser.
- Size and length: Up to 30 MB and 10 minutes per file, one file at a time.
- Memory: Your browser decodes the file into uncompressed audio first, and that decoded audio can’t exceed 120 MiB.
- Parts: Up to 60 parts per split. Every part has the length you set, except the last, which can be shorter.
- Where it runs: In your browser. The audio you split isn’t uploaded to a server for splitting.
- What you download: Each part as a separate 16-bit PCM WAV file. There’s no MP3 export and no ZIP download.
How to split an audio file into parts
You’ll need an MP3 or WAV that you own or have permission to edit. Splitting by length takes five steps.
- Choose your file. Use the “Choose audio to split” button to open an MP3 or WAV within the limits above.
- Set the clip length. Enter how many seconds each part should last, such as 60 for one-minute parts.
- Generate the parts list. Choose Split file after setting the seconds per part.
- Check the ranges, then download. Review the number of parts and the last part’s length, then save each WAV separately.
- Check the last part and the joins. Play the last part to the end, then listen across one or two joins between neighboring parts.
Pick a clip length that fits the 60-part limit
The number of parts is the file’s length divided by the clip length, rounded up. To stay within 60 parts, choose a clip length of at least the file’s length divided by 60. For a 10-minute file, that means parts of 10 seconds or longer. For a 3:42 file, any length from 4 seconds up works.
Set a clip length and inspect the last part
The last part is where a split most often surprises people, so it’s worth working through one example.
A worked example: 3:42 split every 60 seconds
Say your MP3 runs 3:42, which is 222 seconds, and you set the clip length to 60. You get four parts:
- Part 1: 0:00 to 1:00, 60 seconds.
- Part 2: 1:00 to 2:00, 60 seconds.
- Part 3: 2:00 to 3:00, 60 seconds.
- Part 4: 3:00 to 3:42, 42 seconds.
The fourth part is shorter because 222 seconds doesn’t divide evenly by 60. It isn’t dropped or stretched: it keeps the last 42 seconds of the recording. The figure shows the same four parts in order, with each part’s number, its time range in the original and the shorter final part. The lengths add up to 222 seconds, the length of the original.
This is arithmetic, not a test result. No parts were exported for this example, so check your own files after you download them.
Check the parts and keep their order
- Count the files. You should have as many parts as the parts list showed, four in this example.
- Check the last part. Play it to the end. It should finish where your recording finishes.
- Listen across a join. Play the last few seconds of part 1, then the first few seconds of part 2. Together they should sound like the original at the 1:00 mark.
- Keep the order. Sort the files by part number, not by the time you downloaded them.
MP3 and WAV input, WAV part downloads
Input. StemNook opens MP3 and WAV files, mono or stereo, up to 30 MB and 10 minutes. Other audio formats, video files and web links aren’t accepted. Your browser has to be able to decode the file, so if one won’t open, try another browser or re-export it.
Output. Each part downloads as its own 16-bit PCM WAV file. The sample rate follows what your browser decoded, so it may differ from the original. If you split an MP3, you still get WAV parts.
Why the parts can take more space than the MP3
WAV is uncompressed. Stereo at 44.1 kHz and 16-bit takes about 10.6 MB per minute, so each 60-second part in the example is about 10.6 MB and the four parts together come to about 39 MB, even if the MP3 you started with was a few megabytes. Check your storage before splitting a long file, especially on a phone.
The same arithmetic limits WAV input: a WAV in that format reaches the 30 MB limit at just under three minutes, so long recordings fit better as MP3.
What WAV output does and doesn’t mean
The browser decodes your file before splitting, and each part may be resampled or converted to 16-bit, which can change the audio slightly. The parts aren’t bit-for-bit copies of the original. Keep your original file.
When splitting by length helps
Splitting by length suits recordings you want in regular, predictable pieces.
- Voice notes and interviews. Cut a recording into sections that are easier to review, share or work through in order.
- Length-limited uploads. Make parts that stay under a length another app or service accepts.
- Samples from your own audio. Slice a recording you own into regular pieces to sort through later.
Splitting by length cuts at fixed times, not at the ends of words or songs. To keep one specific section instead, use a cutter, which takes a start and end time.
Cut points and audio quality
Fixed-length splitting is predictable, but a cut can land anywhere, including in the middle of a word or a note.
- Cuts mid-sound. A part can start or end partway through a word. If that matters, try a different clip length so the cuts fall in quieter places.
- Clicks at the joins. Ending a part in the middle of a sound can cause a click or pop. StemNook doesn’t add fades or smooth cut points automatically.
- Small changes to the audio. Converting to 16-bit WAV, and resampling when the browser does it, can alter the sound slightly.
Privacy: what stays in your browser
Splitting runs in your browser, so the audio you split isn’t uploaded to a server for splitting. That applies to this tool only. StemNook’s AI tools process audio in the cloud.
Limits for long recordings and mobile memory
This splitter is built for files up to 10 minutes, not hours-long recordings. A multi-hour MP3 can’t be opened here, even when you only want 10-minute parts, so you’ll need other audio software for those.
Memory can stop a file before the length limit does. Decoded stereo audio at 44.1 kHz takes about 21 MB per minute, so by that arithmetic a stereo file reaches the 120 MiB memory limit at roughly six minutes. That’s an estimate from the format, not a measurement. On a phone, shorter files and fewer parts are safer, and you’ll be saving each part separately.
Audio file splitter troubleshooting
Start with what you see.
- The file won’t open. Check the type, size and length, then try another browser or re-export the file.
- The split would make too many parts. Choose a longer clip length, at least the file’s length divided by 60.
- The last part is short. That’s expected when the length doesn’t divide evenly. Check that it plays to the end of the recording.
- The parts are out of order. Sort by part number rather than by download time.
- A join clicks or cuts a word. Try a slightly different clip length.
- A part doesn’t download. Check that your browser allows downloads from this site, then try that part again.
Audio file splitting questions
Why is my last part shorter than the others?
Because the recording’s length isn’t an exact multiple of your clip length. A 222-second file in 60-second parts leaves 42 seconds at the end, and that becomes the last part.
How many parts can I make?
Up to 60 per split. To stay within that, use a clip length of at least the file’s length divided by 60.
Can I split audio into equal parts?
There is no mode where you enter a number of parts. Enter seconds per part instead; decimal values are accepted. If the duration divides evenly by that length, the parts can be equal. For an exactly 222-second file, 55.50 seconds per part gives four equal ranges. At 60 seconds per part, it gives three 60-second ranges and a final 42-second range. Exported boundaries follow audio samples, so verify the files.
Can it split at silences or at times I choose?
No. It doesn’t detect silence, and it doesn’t take a list of cut points. It cuts at regular intervals. To keep one section between two times you pick, use a cutter instead.
Can I split a recording that’s several hours long?
No. Files can be up to 10 minutes and 30 MB, and long stereo files can reach the memory limit sooner. For hours-long recordings, you’ll need other audio software.
How do I check that the cuts landed in the right places?
Use the time ranges from the parts list. Play the end of one part and the start of the next, and compare that moment with the same time in your original.
Why do I get WAV parts from an MP3?
The browser decodes your MP3 first, and the parts are saved from that decoded audio as 16-bit PCM WAV files. There’s no MP3 export.
Is my audio uploaded when I split it?
No. Splitting runs in your browser, so the audio you split isn’t uploaded to a server for splitting. StemNook’s AI tools are different: they process audio in the cloud.