#59 · Browser Audio Tool

Extract Audio Segment

Extract an exact time range from a longer recording and download it as a new WAV file.

Choose audio and a range

Set precise start and end times

Drop an audio file here or click to choose a supported audio file

No audio selected

Start timesecondsEnd timeseconds

Choose an audio file to begin.

Audio is processed locally in your browser and is not uploaded.

How to use Extract Audio Segment

Choose an audio file.
Adjust the tool-specific controls, then select the main action button.
Review the measured result, listen to the preview, and download the new file if useful.

What this audio tool does

The extractor copies only the requested sample frames into a new AudioBuffer and encodes that segment as WAV.

Start and end seconds are converted to sample offsets, clamped to the source duration, and applied without reusing the original file bytes.

Export is PCM WAV; compressed-source metadata is not carried into the extracted file.

Supported formats and limits

Input decoding depends on Web Audio support in the current browser. Output is WAV unless this converter explicitly uses a browser-verified MediaRecorder codec.

Stage	Details
Input	Browser-decodable audio, up to 600 MB
Processing	Local Web Audio sample data
Output	New Blob with a matching MIME type

Example and practical tips

Try extract audio segment on a short copy first, listen for artifacts, and then process the full recording. Cleaner input produces easier-to-read results.

Close other audio-heavy tabs while processing.
Keep the source file until you have checked the download.
Reset before testing a different recording.

Frequently asked questions

How do I extract part of an MP3 by timestamp?

Extract Audio Segment uses the option shown above and real decoded audio data, so the best setting depends on the recording rather than a fixed preset.

Are start and end times sample accurate?

Browser audio capabilities vary. The page checks the required decoder or encoder and shows a specific error when it is unavailable.

Why is the extracted segment saved as WAV?

The calculation is based on samples from the selected or recorded audio, not on the filename or a simulated result.

Can I preview the extracted audio before downloading?

Processing stays in this browser tab. Object URLs and decoded buffers are released when you reset or leave the page.

What happens if the end time exceeds the file length?

Use a clean source, preview the result, and adjust the available controls if the first pass is not a good fit.

Related audio tools

Audio Trimmer Audio Merger Fade In Audio Fade Out Audio

Processing details

Privacy	Local browser processing
Core method	Start and end seconds are converted to sample offsets, clamped to the source duration, and applied without reusing the original file bytes.
Priority	B

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