Does trimming a WAV or FLAC lose quality?

No — those formats are lossless, so the trimmed file contains exactly the original samples for the kept range.

Can I fade in or out?

Not yet; the cut is straight. Choose a start point in a quiet moment for a clean edge.

What does “same as source” do for an M4A?

It re-encodes to AAC in an M4A container at the chosen bitrate; the same applies to MP3 and OGG. Lossless sources stay lossless.

Is my audio uploaded?

No. Trimming runs entirely in your browser.

Audio Converters

Audio Trimmer

Cut the dead air off a recording, pull a segment from an interview, or shorten a WAV for a sound effect — in whatever format the file already is, or converted to MP3 on the way.

Runs in your browser — files never leave your device.

Drop supported files here

or click to browse · paste from clipboard · up to 1000 MB each

Select files

Options

Start (seconds)

End (seconds)

Everything outside start–end is removed

Output format

Bitrate

About Audio Trimmer

Trimming decodes the audio, keeps the samples between the start and end you set, and re-encodes to the chosen format: WAV and FLAC stay lossless, MP3 uses LAME, M4A uses the browser’s AAC encoder and OGG uses Opus. Multiple files can be trimmed at once with the same range.

Nothing leaves your device: the media APIs built into modern browsers do the decoding, and WebAssembly handles the encoders the browser lacks. Long recordings work — a two-hour WAV trims in well under a minute.

How to audio trimmer

Drop one or more audio files onto the page.
Set the start and end time in seconds, and the output format (same as source by default).
Click Trim and download the results.

About the formats

MP3 · MPEG-1 Audio Layer III · .mp3

The audio format everything can play: cars, phones, old players, websites. Lossy, but at 192–320 kbps close to indistinguishable from CD.

All MP3 patents expired in 2017; the format is now free to use.
128 kbps is the classic “good enough” rate; 320 kbps is the maximum.
MP3 cannot store multichannel surround or lossless audio.

WAV · Waveform Audio · .wav

Uncompressed PCM audio, the studio and archival standard: perfect quality, about 10 MB per minute at CD quality.

WAV is a container; almost all WAVs hold uncompressed 16- or 24-bit PCM.
A 4 GB file-size limit applies to standard WAV; long recordings use RF64 or BWF.
Because nothing is compressed, converting WAV to MP3 is the fastest way to shrink audio 10×.

M4A · MPEG-4 audio (AAC) · .m4a

Apple’s audio format from iTunes, Voice Memos and the Music app: AAC audio in an MP4 container, better than MP3 at the same bitrate.

M4A usually holds AAC; the .m4a from Apple Music purchases may be ALAC (lossless) instead.
Voice Memos on iPhone save M4A; many transcription and Android apps prefer MP3.
M4A supports chapters and cover art metadata.

FLAC · Free Lossless Audio Codec · .flac

Lossless compressed audio, about half the size of WAV with bit-identical playback; the format of choice for music archives and hi-fi downloads.

FLAC is open and royalty-free and supports up to 32-bit, 8 channels and 655 kHz.
Decoding FLAC is light, so most phones and players handle it; some car stereos and iTunes do not.
Converting FLAC to MP3 is lossy; keep the FLAC as the master.

Related conversions

More in Audio Converters · All converters