Trim an audio recording

Choose the start and end time in seconds. The browser decodes the original and exports only the selected section as 16-bit PCM WAV, without sending it to a server.

What this tool actually does

Trim audio performs a specific media transformation in the browser where supported and creates a new output. The operation works from the detected file format rather than trusting only the extension written in the filename.

How the result is verified

The output is decoded, serialized or reopened as appropriate and the tool reports checks tied to what it can actually prove. A generated download is not labelled verified merely because bytes were produced.

Limits and fidelity

Quality, colour, transparency, animation, metadata or compression can change between formats. MakeFileWork keeps processing bounded and does not claim to preserve features the destination format cannot represent.

When to use this workflow

Use this workflow when you need compatibility with another application or a specific media format. If a portal also requires exact dimensions, maximum file size or other constraints, validate the transformed result with the upload-requirement workflow.

Privacy and final verification

Keep the original file until the output has been reviewed in the destination application or portal. Supported workflows process locally in the browser and enforce bounded size and complexity limits. For Trim audio, verify that the generated format preserves the properties that matter for your use case. For important data, compare a representative sample and confirm that format, content and quality meet the actual requirement before replacing the source file. Also open the generated file in the destination application when compatibility, colour, transparency, layout or compression matters.

How the cut is calculated

The start is rounded down to a sample boundary and the end up to the next sample. If the end exceeds the source duration, the result stops at the actual end of the recording; the output summary shows the effective interval.

Size and codec limits

The input must be at most 50 MB and 30 minutes, mono or stereo at 8–96 kHz. The exported WAV is limited to 64 MiB, regardless of how small the compressed input is. Invalid ranges, inconsistent channel lengths or invalid samples are rejected instead of silently altered.

What is actually verified

The RIFF/WAVE header and PCM payload length are re-read after encoding. Playback is not independently tested. MP3, AAC/M4A, OGG, FLAC and WAV sources work only if your browser supports the codec.

Convert the full recording to WAV