AcadCrate

ON YOUR DEVICE · FREE

Audio Joiner

Combine mono and stereo audio end to end, keeping each clip’s trim and applying shared volume and fades. Download MP3 or WAV without uploading clips.

AcadCrate

Audio workspace

Preview
On device
YOUR AUDIO STUDIO

Find your flow.

Choose audio to begin.

Audio guide

Choose your files once. Trim each clip, then adjust the shared volume and fades. Join exports all clips in their displayed order; the other tools export only the selected clip.

Supported files and limits

Use up to 5 clips, 128 MB each, 160 MB of encoded files total, and 10 minutes of combined source audio. Mono and stereo only. Input formats depend on browser decoding: WAV and MP3 are the starting point; M4A/AAC, Ogg, FLAC and WebM may work where supported. Unknown duration, unsupported formats or excessive decoded memory produce an error. Short clips work better on phones.

Export formats

Choose Export, then MP3 or WAV. MP3 quality offers Auto, 128, 192 or 320 kbps. Auto chooses one of those three bitrates using channel count and representative audio detail, balancing quality and file size; it cannot measure original recording quality or restore lost detail. MP3 uses lossy compression for smaller files. Higher bitrates use more space; converting to MP3 again can reduce quality. MP3 can include a small amount of encoder padding. WAV output is uncompressed 44.1 kHz, 16-bit PCM WAV, up to 128 MB. Audio is decoded and resampled by the browser; this is not lossless cutting of MP3 or preservation of the original encoding, metadata or bit depth. Output can be larger than the original. Mono clips are duplicated into left and right channels when joined with stereo clips.

Fades and clipping

Fades are linear and apply independently to each trimmed clip. They do not crossfade overlapping clips. Volume above 100% may clip; the optional clipping protection reduces the whole output if needed. It does not remove noise or repair existing distortion. Listen at a comfortable device volume.

Privacy and downloads

No selected audio, filenames or waveform data are uploaded, and this workspace requests no microphone permission. Only anonymous daily operation and outcome counts are sent; audio content and metadata are excluded. General website analytics remain separate. Files are held in this tab; clearing or leaving loses the session. Keep downloads before leaving. Read the privacy policy.

MP3 encoder credits

MP3 encoding uses LAME through the unmodified @breezystack/lamejs module, loaded from this site. Notices and source · LAME project.

Detailed guides: Trim · Join · Volume · Fades.

Clear the audio workspace?

Download anything you want to keep. Clips and edits are only held in this tab; original files stay unchanged.

How do I join audio clips in the order I want?

Add clips, drag them into order in Clips and choose Join. Export combines all clips end to end in that order, using each clip’s trim plus shared volume and fades. Listen before downloading.

A worked example

A three-second selection followed by a six-second clip produces a nine-second selection. No crossfade or overlap is added. When joining mono and stereo, mono audio is copied into both stereo channels.

Files, format and limits

Up to five clips, 128 MB each, 160 MB total and ten minutes of combined source audio. Mono and stereo only; decoded memory is also bounded. Input decoding depends on your browser. WAV and MP3 are the starting point; M4A/AAC, Ogg, FLAC and WebM may work where supported. An unsupported file or unreadable duration produces an explanation.

Choose MP3 with Auto quality or a fixed 128, 192 or 320 kbps, or 44.1 kHz, 16-bit PCM WAV. MP3 uses lossy compression and can include a small amount of encoder padding; WAV is uncompressed. Exports are bounded to 128 MB. Browser decoding can resample audio; this is not lossless editing of compressed files or preservation of metadata, the source codec or original bit depth. WAV output can be much larger than MP3. Noise removal, transcription and microphone recording are not included.

Keep your originals

The workspace holds audio and edits in this tab, without uploads or microphone access. Export to hear changes; Original audio is unedited. Download anything you need before clearing, reloading or leaving. Audio editing does not send the separate image/PDF action counters. General website analytics are described in our privacy policy.

Guide reviewed . Who runs AcadCrate · Report a problem.

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