Trim and cut audio files online — MP3, WAV, M4A, FLAC, and OGG. Set start and end times with sliders, then download the trimmed MP3 clip. Audio never leaves your device — conversion and editing run locally in your browser with FFmpeg WASM.
Runs on FFmpeg
Content reviewed October 2026 · About Toolzum
Convert between MP3, WAV, FLAC, OGG, M4A, and AAC audio formats. Pick any input and output format — your files never leave your device.
Convert whole batches of audio between WAV, MP3, and OGG with one output format and sample rate for the whole batch. Podcasters standardize 50 episodes for every platform — local processing, 2 free batches a day.
Converts MP3 files to WAV format — universal music playback and sharing across all devices and platforms to professional audio editing, mastering, and archival in DAWs and production software. All conversion happens locally in your browser; files up to 100 MB each.
Turn a full podcast episode into a text transcript with AI speech recognition — upload MP3, WAV, or M4A and get searchable text. Hosts convert a 30-minute show into show notes — 1 credit per minute.
Cut start/end segments from any video with fast stream-copy trimming in your browser (keyframe-aligned, no re-encode). Remove a 45-second cold open from a 10-minute upload — local FFmpeg work, unlimited saves.
Move the Start Time and End Time sliders in 0.5-second steps to set your trim points — the final clip length updates live above the Cut Audio button.
The selection is re-encoded as MP3 through FFmpeg in your browser, so a generation of lossy compression applies — keep your masters. For critical edits, cut once from the original.
Upload MP3, WAV, M4A, OGG, AAC, or FLAC; the trimmed clip always downloads as MP3 named trimmed_<name>.mp3.
Half-second steps on files of any length your browser can load — the end point defaults to the first 10 seconds, or the full duration if the file is shorter.
Cuts can be fractions of a second (0.5 s steps) as long as end stays after start. There is no maximum — the tool handles files of any length your browser can load into memory.
Audio Merger
Combine multiple audio files into one continuous track. Supports crossfade between songs and automatic volume normalization. Perfect for making mixtapes, podcasts, and audiobooks.
Fade In/Out
Apply smooth volume fades to your audio tracks. Supports fade in, fade out, or both with linear, logarithmic, exponential, and S-curve transitions. Perfect for podcast intros and outros.