Audio Tools
Trim, merge, split, and normalize audio files using a real FFmpeg engine in your browser.
Trim Audio
Cut an audio file down to a selected start and end point.
Normalize Audio
Even out volume to a consistent, target loudness level.
Merge Audio
Combine multiple audio files into a single continuous track.
Split Audio
Split one audio file into several segments at chosen timestamps.
Audio Speed Changer
Speed up or slow down audio from 0.25x to 4x, without changing its pitch.
Audio Pitch Changer
Shift audio pitch up or down by semitones, keeping the original duration unchanged.
Audio Volume Booster
Increase or decrease audio volume by a precise decibel amount.
Reverse Audio
Flip an audio file to play backwards, from end to start.
Audio Fade In/Out
Add a smooth fade-in at the start and/or fade-out at the end of an audio track.
About Audio Tools
Trimming dead air from a recording, normalizing volume before publishing, merging separate takes into one track, or splitting a long file into segments are quick editing tasks that don't warrant installing dedicated software. This collection runs on a genuine FFmpeg build compiled to WebAssembly, the same engine widely used in professional audio tools, entirely inside your browser. Looking to change an audio file's format, or pull audio out of a video? That's handled by the dedicated Audio Converter category.
Why use these tools
- A real FFmpeg engine handles trimming, merging, splitting, and normalization — the same processing quality as installed desktop software.
- Waveform-based trimming and splitting make it easy to see exactly where a sound begins or ends before you cut.
- Loudness normalization brings recordings to a consistent, appropriate volume without risking distortion from a blunt volume increase.
- Nothing is uploaded to a server — audio files, including sensitive voice recordings, are processed entirely on your own device.
Related articles
Why Podcast Episodes Sound Inconsistent (and How Loudness Normalization Fixes It)
Listeners reaching for the volume knob between episodes usually means one thing: inconsistent loudness. Here's what normalization actually does about it.
WAV vs AIFF: Comparing Two Uncompressed Audio Formats
WAV and AIFF do the same basic job — store audio with zero compression loss — but split largely along Windows versus Mac lines. Here's what that split actually means practically.
How to Convert MP3 to WAV
Switching from compressed to uncompressed audio — when it's actually useful, and what conversion can and can't restore about the original quality.
Frequently asked questions
Is format conversion or pulling audio from video in this category?
No — converting between audio formats and extracting audio from a video file (like MP4 to MP3) both live in the dedicated Audio Converter category. This category covers editing operations on audio you already have: trimming, merging, splitting, and normalizing.
Is my audio file uploaded anywhere during processing?
No. Every audio tool here runs locally using a real FFmpeg engine compiled to WebAssembly. Your file is never transmitted anywhere.
Which tool should I use to fix a recording that's too quiet or too loud?
Normalize Audio analyzes the file and adjusts it toward a consistent target loudness, which is a more reliable fix than simply applying a flat volume boost that risks distortion.
Can I combine several separate recordings into one file?
Yes, Merge Audio joins multiple files into one continuous track in whatever order you set, even if the source files are in different formats.
Can I cut one long recording into several separate files?
Yes, Split Audio lets you set multiple split points and exports every resulting segment together, useful for dividing a long lecture or interview into shareable pieces.