MultiKit

Audio Cutter: Trim MP3 and Other Sound Files Online

  • Free
  • No sign-up
  • Runs in your browser
  • Version 1.0.2
  • Last updated 2026-11-02
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Cut the part you want out of a sound file, for a ringtone, a clip or to remove a silence at the start. Play the file, mark where the piece begins and ends, and download it.

What this browser can make

    This depends on your browser, not on MultiKit. Chrome and Edge support the most.

    Everything you enter is processed in your browser and is never sent to a server.

    Browsers:Chrome94+Edge94+Firefox130+Safari26+Opera80+Samsung Internet17.0+BrowsersWhich formats it can read and write also depends on your browser and device; the tool shows what yours can do.

    How to use

    1. Drop the audio file onto the box, or choose it. A player appears.
    2. Play the file and press Start here where the piece should begin, and End here where it should end. Or type the times, as seconds or like 1:23.5.
    3. Choose the format of the piece. MP3 plays everywhere, and WAV keeps every detail.
    4. Press Convert, listen to the result, and press Download.

    Examples

    Start 0:30, End 1:15
    → A piece 45 seconds long
    The end minus the start.
    Start left empty, End 0:20
    → The first 20 seconds
    An empty Start means the beginning of the file.
    Start 2:00, End left empty
    → From 2:00 to the end
    An empty End means the end of the file.
    Start 1:00, End 0:30
    → Error: The end must be after the start.
    The page refuses a piece that would run backwards.
    Start 5:00 in a 2-minute file
    → Error: The start is after the end of the file.
    Nothing is cut and nothing is guessed.
    Start 0:10, End 10:00 in a 2-minute file
    → From 0:10 to the end
    An end beyond the file just means the end of the file.
    Start 1h2m3s
    → 3,723 seconds into the file
    Times can also be written as seconds (83), 1:23, 1:23.5 or 01:02:03.

    How it works

    This page is the audio converter with the cutting boxes in front. The file is decoded by the WebCodecs of your browser, through the open-source Mediabunny toolkit; the part between your start and end is kept and encoded in the format you choose, with LAME for MP3 (credited at lame.sourceforge.io). The start and the end you type are checked, and a start after the end of the file, or an end before the start, is reported, not guessed at. This page uses the audio and video codecs built into your browser, so what it can read and write depends on the browser. The list under the tool shows what yours can make. Chrome and Edge support the most.

    How the two boxes are read

    Each box takes a time as plain seconds (83), minutes and seconds (1:23 or 1:23.5), hours (01:02:03), or letters (1h2m3s). Minutes and seconds above 59 inside a clock-style time are not accepted. An empty Start means the very beginning, and an empty End means the very end, so leaving both empty converts the whole file. The length shown for the result is the end minus the start.

    Marking by ear

    Play the file, press Start here when the piece should begin and End here when it should finish, and the times are filled in for you. Marking while the sound plays is accurate to a fraction of a second, because it is your reaction that sets the time. To tidy it up, change the number by hand and play the result before you download it.

    Cutting for Format Why
    A ringtone or an alert MP3 or M4A Phones accept these
    A clip to share MP3 Plays everywhere
    A piece to edit further WAV or FLAC Nothing is discarded

    What it does not do

    The page keeps one piece of the file. It does not fade the ends in or out, change the volume or the speed, remove noise or merge pieces. When you need a silent gap trimmed from the start of a recording, set Start just after it.

    Sources

    Frequently asked questions

    How exact is the cut?
    As exact as the times you type or mark. Pressing the buttons while playing is accurate to a fraction of a second, so for an exact cut, type the time.
    Does cutting lose quality?
    The piece is encoded again in the format you choose, so a lossy format such as MP3 discards a little. To lose nothing, choose WAV or FLAC.
    Can I make a ringtone?
    Yes: cut up to 30 seconds and download an MP3 or M4A. Phones differ in the format and length they accept, so check yours.
    Can I cut a video's sound?
    Yes. Drop the video, and the piece you cut is the sound only.
    Is my file uploaded?
    No. It is cut in your browser.
    Can I cut out the middle and keep the two ends?
    Not in one step: the page keeps one piece. Cut the first part and the last part as two files, and join them in a program that merges audio.
    How big will the piece be?
    For MP3 or M4A, the bitrate times the length of the piece divided by 8. A 45-second piece at 192 kbps is 1.08 MB. WAV is larger and does not depend on a bitrate: CD-quality stereo takes about 10.6 MB a minute.
    Which format should I choose for the piece?
    MP3 plays everywhere. M4A is a good alternative on Apple devices and phones. WAV and FLAC lose nothing, which suits a piece you will edit further, and FLAC is smaller than WAV.
    Can I take the piece out of a long recording, such as a lecture?
    Yes. Play the file to find the spot, press Start here and End here, or type the times.
    What if the end is past the end of the file?
    It is treated as the end of the file, and nothing is reported. A start past the end of the file is reported, because there would be nothing to keep.

    Guides

    Version history
    • 1.0.2 — Adds how the start and end boxes are read (including the error cases), marking by ear, which format to choose for the piece, what the page does not do, and more examples and questions.
    • 1.0.1 — Makes the search title and description state the supported task, key formats and privacy benefit more clearly.
    • 1.0.0 — First release.

    Last updated: