Audio Loop-Point Finder

Compare sample-boundary loop candidates around entered markers and audition the chosen region.

Files stay on your device No sign-up Free to use
How this works

The tool runs in this browser. Your file or text is not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

Privacy details

Find loop controls

Drop your file here

or choose one from your device

RIFF WAV, mono/stereo, PCM16/24/32 or float32, 8-96 kHz. Up to 128 MiB and 600 seconds.

    Leave empty for the recording end. The end marker is exclusive.

    Review the numbered alternatives, change this ID, and rerun to compare the chosen seam.

    How to use Audio Loop-Point Finder

    1. Select a WAV and enter approximate loop start and end times.
    2. Choose a search radius and run the comparison.
    3. Review the numbered candidates, select an ID and rerun to audition its repeating region.

    Example: Audio Loop-Point Finder

    Compare nearby boundaries in a repeating tone.

    You add
    One-second mono WAV at 48 kHz containing a 440 Hz sine. Start: 0.2 seconds; end: 0.8 seconds; search radius: 20 ms; candidate: 1.
    You get
    The table ranks candidate sample boundaries near those markers. The chosen WAV uses its reported frame range; the marker JSON records an exclusive end frame.

    Options

    Target markers and search radius
    Markers give the approximate region. The radius sets the bounded zero-crossing search around each marker; the end frame in an export is exclusive.

    Supported inputs and limits

    Selected files128 MiB total
    Supported duration600 seconds
    RIFF WAV only: mono/stereo PCM16, PCM24, PCM32 or float32 at 8–96 kHz; up to 128 MiB and 600 seconds. Compressed WAV, extended headers and other containers are refused. Work stays on your device. Up to 12 ranked alternatives from a bounded zero-crossing search. Export has no crossfade or embedded loop metadata; listen to the seam yourself.

    Where your input is processed

    This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

    An attractive score is a candidate

    The search compares sample jump, slope and nearby-window error for both channels. A low score can reduce a discontinuity without making a musical phrase repeat naturally. Listen across several joins and check rhythm, tails and stereo placement.

    Keep frame markers with the source

    The downloaded region contains only the selected samples and uses PCM16. The JSON preserves exact start/end frames, sample rate and metrics. Those frame numbers belong to this source; they are not portable timestamps for a different edit or sample rate.

    Questions about Audio Loop-Point Finder

    Does it blend the end into the beginning?

    No. It exports an unblended region so you can evaluate the selected boundary.

    Are loop markers written inside the WAV?

    No. Exact source frames and seam metrics are saved in a separate JSON file.

    Is my input uploaded?

    Nothing is uploaded.

    Project manager: Tony Hines · Content updated 4 October 2026 · Report a problem