Free tool · the file stays on your device
Cut audio into parts
Drop a recording on the page and the tool tells you how many parts it takes for every part to fit the 64 MB limit of one file. Mark the cuts yourself, listen to the parts, download them one by one or all at once. Everything happens in your browser — the file is never uploaded.
Your marks
Write the time where the cut goes and press Enter.
The parts
The file does not fit into 64 MB — cut it here, and get the text from us.
One file of the service is 64 MB and 120 minutes. A recording that is bigger has to be sent in parts: cut it here, upload the parts one after another, and every part comes back as text with its timecodes. The parts are not smaller than the limit — the tool says so for every one of them.
How to use it
From a recording that does not fit to the parts that do.
- 1 · Give the tool the file
- Drop an audio file on the block, pick it with the button, or try the sample recording. The file is read in the page: no request carries it and nothing is stored. The tool reads the header of the file, so it knows the length, the sample rate and the bitrate before it decodes anything.
- 2 · Count the parts
- The mode “under the limit” counts them: the tool divides the file into the smallest number of parts so that every part fits the 64 MB limit of one file. The card above the line shows what the file was and what it becomes.
- 3 · Or put the cuts yourself
- The mode “by marks” cuts where you want. Click on the line of the recording, or write the time (1:30 or 90) and press Enter. Every part shows its length, its size and whether it fits the limit.
- 4 · Download and send
- Download one part or all of them in one archive, then upload the parts to the service. Every part has a link to the main page, where the file goes to the engine and comes back as text.
The limit
Where the number comes from.
One file of the service is 64 MB and 120 minutes. The size is counted as 64 × 1024 × 1024 bytes, so the limit the tool works with is 67 108 864 bytes.
| What | Value | Where it comes from |
|---|---|---|
| Size of one file | 64 MB (67 108 864 bytes) | the service contract |
| Length of one file | 120 minutes (two hours) | the service contract |
| The same limit on every plan | Free, Pro, Team and API | the service contract |
- A part is measured by the file that comes out of the tool, not by a guess: the WAV copy has a header and sixteen bits a sample, and the tool counts the frames of every part.
- A WAV file is not compressed, so the WAV copy of a recording is much bigger than the recording itself. The card above the line shows both numbers, so nothing is a surprise later.
- An MP3 file can be cut without decoding it: the frames of the recording are copied as they are, and the part keeps the compression. The mode “the same format” does that, and the size of such a part is known exactly.
- A cut of an MP3 goes along the border of a frame. One frame of an MP3 lasts 26 milliseconds at 44 100 Hz, so the cut lands within a frame of the mark you set.
FAQ
Questions about the cut.
- How do I cut a file?
- Two ways. The mode “under the limit” counts the parts for you: the tool divides the recording into the smallest number of parts so that every part fits the 64 MB limit of one file. The mode “by marks” cuts where you say: click on the line of the recording or write the time of the cut. Every part can be listened to before it is downloaded.
- What happens to the quality of the recording?
- The WAV copy holds the same samples as the recording: the tool decodes the file and writes the samples back, so nothing is resampled and nothing is re-encoded. The MP3 part holds the frames of the recording as they are, so it sounds exactly like the part of the original. The cut itself is at the nearest frame, which is 26 milliseconds at 44 100 Hz.
- Do the parts fit the 64 MB limit?
- That is the whole point of the tool. In the mode “under the limit” the count of the parts comes from the limit itself: every part that comes out is smaller than 67 108 864 bytes, and the page says so for each of them. When you cut by marks yourself, a part that is too big is marked as such instead of being hidden.
- Is my recording sent to a server?
- No. The file is read with the file reader of the browser, decoded by the browser and written back as a download. There is no form to submit, no upload and no request that carries your recording, and nothing about it is stored. The only file the tool fetches is the sample recording of the site, so that a reader can see how it works without a file of their own.