About this tool
Create a deterministic, uncompressed audio excerpt while keeping file claims, decoded properties, selection boundaries, and output verification explicit.
- Checks maintained binary signature evidence and uses the current browser decoder as the authoritative compatibility test for a bounded local source.
- Converts strict decimal start and end times to outward-rounded sample frames, supports local selection preview, and preflights decoded memory and PCM output size.
- Encodes interleaved 16-bit little-endian PCM in an isolated Worker, then verifies RIFF size, format, byte rate, alignment, data length, and requested frame count before download.
How to use Audio Trim
Choose one bounded audio file, decode it in the current browser, enter strict decimal start and end seconds, preview the frame-aligned selection, then create and download the WAV only after structural verification passes.
When this tool is useful
- Removing silence or extracting a short review excerpt without uploading audio.
- Preparing a deterministic uncompressed clip for an editor, test fixture, or transcription handoff.
Practical tips
- Keep the source because tags, cover art, cue data, compression, and container metadata are not copied.
- Check the displayed decoded sample rate because the browser can resample during decode; the WAV uses that rate.
- Use the JSON evidence to record decoded properties and exact frame boundaries.
- Use a dedicated audio editor when fades, loudness processing, controlled resampling, compressed output, or multitrack work is required.
Examples you can test
Load an example, compare the result with the expected output, then replace it with your own input.
Trim an interview excerpt
Example input
60-second browser-decodable recording; start 12.5 s; end 27.0 s
Expected output
Frame-aligned 16-bit PCM WAV plus versioned JSON evidence
The uncompressed output may be much larger than the source, and browser codec support varies.
Validation checklist
- Preview the selected speech and both boundaries.
- Confirm decoded channel count and sample rate match the intended source.
- Open the downloaded WAV in its destination player and compare duration and channels.
- Retain the source and evidence until the output has been accepted.