What audio formats can I trim?

To cut a WAV file, drop it into the tool, drag across the waveform to select the part you want to keep (or type the start and end times in steps of 0.1 second), preview the selection, then click "Cut & Download WAV". The file is decoded and cut in your browser.

The exported clip is an uncompressed WAV: 16-bit PCM, with the same number of channels as your file, at the sample rate your browser's audio engine runs at (typically 44,100 or 48,000 Hz; a source recorded at another rate is resampled). Its size follows a simple formula: bytes = sample rate × 2 bytes × channels × seconds + 44, the 44 bytes being the WAV header.

Clip length	44,100 Hz stereo	48,000 Hz stereo	44,100 Hz mono
10 seconds	1.76 MB	1.92 MB	0.88 MB
30 seconds	5.29 MB	5.76 MB	2.65 MB
1 minute	10.58 MB	11.52 MB	5.29 MB
3 minutes	31.75 MB	34.56 MB	15.88 MB

Example: 30 seconds of stereo at 44,100 Hz gives 44,100 × 2 × 2 × 30 + 44 = 5,292,044 bytes, about 5.3 MB (1 MB = 1,000,000 bytes).

This matters when you start from an MP3. A 3-minute MP3 at 128 kbps weighs about 2.9 MB (128,000 bits × 180 seconds ÷ 8), but the same 3 minutes exported as stereo WAV at 44,100 Hz weigh about 31.8 MB. If you need a small file, cut here, then convert the clip to MP3. If your original WAV is 24-bit, keep in mind that the export is 16-bit.

Trim audio online — free & private

SpeakAndRecord's audio cutter lets you trim any audio file directly in your browser using the Web Audio API. Upload your file (MP3, WAV, OGG, WebM, M4A, or any format your browser supports), and the tool decodes the audio, draws the full waveform, and lets you drag to select the exact region you want to keep.

You can fine-tune the start and end points using the number inputs for precise frame-level control, and preview just your selected section before committing to the export. Once you're satisfied, clicking "Cut & Download" renders the selected audio buffer as a high-quality WAV file using OfflineAudioContext — no re-encoding artifacts, no quality loss.

Common uses include removing silence from the beginning of a voice recording, extracting a clip from a podcast, cutting a ringtone from a song, or trimming a sample for a music project. Unlike desktop tools, SpeakAndRecord runs entirely in the browser with no installation.

What audio formats are supported?

Any format your browser's AudioContext can decode — typically MP3, WAV, OGG Vorbis, WebM Opus, and M4A/AAC. FLAC is supported in Chrome and Firefox. WMA is not supported.

Is my audio uploaded to a server?

No. Your file is read locally using the FileReader API and decoded in memory by the Web Audio API. Nothing is transmitted to any server.

What format is the exported file?

WAV (PCM 32-bit float). It's lossless and universally compatible. You can convert to MP3 using Audacity, HandBrake, or ffmpeg if a smaller file size is needed.

How big is a WAV file after cutting?

Multiply the sample rate by 2 bytes (16-bit), by the number of channels and by the clip length in seconds, then add 44 bytes of header. A 30-second stereo clip at 44,100 Hz is 44,100 × 2 × 2 × 30 + 44 = 5,292,044 bytes, about 5.3 MB.