SnipFree Audio Fade In / Out Tool
Add a smooth fade-in to the start of any audio file and / or a fade-out to the end. Tune the duration and curve, preview the result, and download. Works on MP3, WAV, FLAC, AAC, and M4A — 100% in your browser, nothing uploaded.
No file handy?
Drop audio file here
or click to browse — faded in your browser, never uploaded
MP3WAVOGG
FLACAACM4A
Your audio is never uploaded. Decoding, fade application, and encoding all happen in your browser — nothing is sent to a server. Privacy policy.
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Fade region (volume ramp)
Adjust the sliders below to see the curve update live.
Quick presets:
Fade In
2.0 s
Fade Out
3.0 s
Plays the faded version with a moving playhead.
MP3 320 keeps quality and works everywhere.
Add fade-in and fade-out to MP3, WAV, FLAC — free, private, no sign-up
SnipSound's Audio Fade tool applies a volume ramp at the start and / or end of your audio file. Pick the duration of each fade independently (0 to 10 seconds), choose a curve (linear, exponential, or logarithmic), preview the result, and download. The original file is never modified — you get a fresh export with the fades baked in. Everything happens in your browser; nothing uploaded.
Linear vs exponential vs logarithmic — which curve to pick
Linear
Constant rate of volume change. Half the duration = half the volume. Sounds neutral and works for almost any material. Use as your default.
Exponential
For fade-in: starts very quiet, ramps up faster near the end — volume "blooms" in. For fade-out: drops quickly, then settles slowly into silence. Matches how human hearing perceives loudness; often sounds more musical for longer fades.
Logarithmic
The inverse of exponential. Fade-in: quick volume rise, then plateaus. Fade-out: holds level, then drops fast at the end. Good when you want the fade to feel snappier and end (or start) more decisively.
Common use cases
🎵 Song endings
3–8 second exponential fade-out is the classic. Adds polish to a track that ends abruptly.
🎙 Podcast intros
0.5–1 second linear fade-in on the music bed prevents the harsh "click" of starting at full volume.
🎬 Background music for video
2–3 second fade-in and fade-out helps the bed slip under and out from voiceover cleanly.
📞 Voice memo cleanup
0.2–0.5s fades on each end remove pop / breath artifacts at the start and stop of a recording.
🔊 Sound effects
Sub-100ms fades smooth the edges of a SFX clip so it doesn't click when retriggered.
🎧 Sample loops
Match the fade-in and fade-out lengths so a loop point becomes inaudible.
How long should a fade be?
- Songs: fade-outs are usually 3–8 seconds. Fade-ins on songs are rare (most start cold), but 0.5–2s is the range.
- Podcasts: 0.3–1 second on each end. Longer fades sound sleepy in spoken-word context.
- Background music beds: 2–3 seconds. Long enough to let the bed slip under voice; short enough to not feel slow.
- Sound effects: 0.02–0.1 seconds. Just enough to kill the click at the edges. Long fades on SFX kill the impact.
- Maximum useful length: 10 seconds. Beyond that, you're approaching "the whole song" — at which point you might want our Volume Booster's manual gain envelope instead.
Why use SnipSound's fade tool
- 100% in your browser. Most online fade tools (audiotrimmer fade, mp3cut fade, online-audio-converter) upload your file to a server. We don't — the audio never leaves your device.
- Three curves in one place. Linear, exponential, logarithmic — pick what sounds right instead of being stuck with one shape.
- Live preview. Hear the faded version with a moving playhead before committing to a download.
- Real Web Audio fades. We use OfflineAudioContext + GainNode ramps to apply the fade, not a workaround over the file. The output is bit-exact to what you previewed.
- Any common audio format in, any common format out. MP3, WAV, FLAC, OGG, AAC, M4A — all handled by the shared SnipSound encoder pipeline.
Related tools
Audio fade FAQ
How do I add a fade-in or fade-out to an MP3?▼
Upload your audio file, drag the Fade In and Fade Out sliders to set the duration (in seconds) for each, pick a curve (Linear is the standard for most music), preview to hear the result, then click Apply Fade & Download. The fades are baked into the new audio file.
What's the difference between a linear and an exponential fade?▼
A linear fade changes volume at a constant rate — half the duration = half the volume. It sounds neutral and is fine for most music. An exponential fade matches how human hearing actually perceives loudness — it ramps up slowly then accelerates (or for fade-out, drops quickly then settles slowly). Exponential fades often sound more natural and musical, especially for longer fade-outs at the end of a song.
How long should a fade-in or fade-out be?▼
Music: 2–8 seconds is typical for song endings; 0.5–2 seconds for fade-ins. Podcasts: 0.3–1 second is usually enough to soften a hard cut. Sound effects: under 0.2 seconds — just enough to avoid clicks at the edges. The tool caps each fade at 10 seconds, which is longer than any natural-sounding fade you'd ever use.
Can I crossfade two audio files together?▼
Yes — use the Audio Merger tool instead. It combines multiple files end-to-end with an optional crossfade between adjacent tracks. This tool fades a single file's beginning and / or end; the Merger fades between two files.
Does the fade reduce file size?▼
The output is the same length as the input — fading only changes the volume curve at the edges, not the duration. File size depends mostly on the output format and bitrate you pick. To shrink the file, run the result through our Audio Compressor afterwards.
Is my audio uploaded to a server?▼
No. Decoding, fade application, and re-encoding all happen in your browser using the Web Audio API. Your audio never leaves your device.
What input formats are supported?▼
Any audio format your browser can decode — MP3, WAV, OGG, FLAC, AAC, M4A. Output formats include MP3 (320, 256, 192, 128 kbps), WAV, FLAC, OGG, AAC and M4A.