Audio Trimmer & Fade Tool

Knowledge Base

How to Use This Tool

Upload any browser-decodable audio file, then drag the two handles on the waveform to set your trim start and end points. Add a fade-in and/or fade-out in milliseconds. Both use an equal-power (cosine) curve, which sounds smoother and more natural than a straight linear fade, especially on short durations.

Why Equal-Power Fades Sound Better

A linear fade's perceived loudness actually drops off faster than it looks on the fader, because human loudness perception isn't linear. An equal-power fade compensates for this, keeping the apparent rate of volume change more consistent throughout the fade, which is why professional editors default to it over a straight linear ramp.

Common Uses

• Cutting dead air from the start or end of a recording before further editing.
• Adding a clean fade-out to a clip that currently just stops abruptly.
• Preparing a short clip or loop that needs to start and end cleanly with no clicks.

FAQ

Q: Can I trim from the middle of a file, not just the start/end?
A: Not with this tool, for removing a section from the middle, see the Silence & Gap Remover, which is built specifically for that.

Q: What format does this export?
A: 16-bit PCM WAV at your original file's sample rate and channel count.

Trimming and fading without clicks

A click at a cut point is not a mistake in the tool. It is physics. Audio is a waveform swinging above and below a centre line, and cutting at a moment when the wave sits away from that line creates an instant jump to silence. Your speaker reproduces that jump as a sharp click. The fix is a fade, even a very short one.

Ten milliseconds is enough to remove a click and is far too short to hear as a fade. Use that as the default at both ends of every trim. Reach for longer fades only when you want the fade itself to be audible, which for spoken word usually means somewhere between a quarter of a second and two seconds at the end of a piece.

Leave a little air around speech. Cutting hard against the first consonant clips the natural attack of the word and makes a presenter sound like they were interrupted. A tenth of a second before the first sound and a slightly longer tail after the last one reads as deliberate. This matters most at the start of a podcast episode, where a clipped first word is the first thing an audience hears.

Fade shape matters over longer durations. A linear fade lowers the level evenly, which sounds like it speeds up at the end because hearing responds logarithmically rather than linearly. Most listeners prefer a curved fade for anything longer than about a second. Over ten milliseconds the difference is inaudible, so it only becomes a decision on the long fades.

Check the exported file matches the sample rate you started with. A trim that silently resamples introduces a conversion nobody asked for, and stacking that with later processing compounds the loss. The exported file should differ from the original only in the ways you asked for.

Vocabulary

Zero crossing. The instant a waveform passes through its centre line on the way between positive and negative. Cutting exactly there produces no click, because there is no jump in level. Short fades achieve the same result without the hunting.

Fade. A gradual change in level over a set time. A fade in rises from silence, a fade out falls to it. Even ten milliseconds is enough to eliminate a click at an edit point.

Attack. The first moment of a sound, where it rises from nothing to full level. Consonants such as t and k have sharp attacks, and trimming into one makes speech sound clipped and unnatural.

Handle. Extra material kept either side of an intended edit point. Handles let you adjust a cut later without going back to the original recording, which is why editors trim generously rather than exactly.