Audio Merger
Audio Merger reads the values you set and shows the generated code and a preview. Sample values are prefilled.
Audio Merger reads the values you set and shows the generated code and a preview. Sample values are prefilled.
Example Audio Merger result merged-audio.wav Output duration: 3 s Sample rate: 48000 Hz Channels: 1 Format: PCM WAV Expected size: 288,044 bytes Next step: Mono sections in stereo output have identical left and right channels. Listen to the downloaded WAV before any separate volume or fade edits.
How to use Audio Merger
Audio is concatenated in selection order. Each file starts after the previous one ends; the tool creates merged-audio.wav rather than mixing tracks simultaneously.
The browser decodes supported files one at a time into 16-bit PCM WAV. Mono segments are duplicated to both channels when combined with stereo. Automatic crossfade, loudness adjustment, and MP3 output are not included.
- Select at least two copies in playback order and check the list. WAV, MP3, and M4A codec support depends on the browser.
- Each file must be at most 40 MiB and 10 minutes. Selection is limited to 100 files and 120 MiB combined; only mono or stereo is supported.
- Run the sequential merger. Reduce clip count or duration if the estimated 192 MiB working-memory or decoded-sample budget is exceeded.
- Check duration, sample rate, and channels, then download merged-audio.wav and listen to every join and the final segment.
Useful for
- Combine short spoken announcements in their intended playback order.
- Place mono voice before or after stereo clips while applying volume or fades separately.
- Verify a one-second plus two-second sample before processing real recording copies.
Limits and checks
- The 10-minute limit is per input. Combined output also has a 50,000,000 channel-sample limit and an estimated 192 MiB working-memory budget, so duration alone does not determine whether a job fits.
- Small compressed files can require much more decoding memory and PCM WAV output. This is conversion to PCM16, not lossless joining of compressed bitstreams; retain originals.
- The sample rate follows browser decoding. Different decoded sample rates or more than two channels cause rejection; resample or downmix in another editor first.
Worked example
Two short mono clips
Selection order: intro.wav → ending.wav Durations: 1 s → 2 s Example condition: both decode at 48,000 Hz mono
Check the actual browser-decoded sample rate in the result.
Concatenated PCM WAV
merged-audio.wav Output duration: 3 s Sample rate: 48000 Hz Channels: 1 Format: PCM WAV Expected size: 288,044 bytes
This assumes exactly three seconds at 48,000 Hz mono; the clips do not overlap.
Common issues
The browser cannot decode the audio or obtain a finite duration.
Check playback in the same browser and use a supported WAV, MP3, or M4A codec. Inputs with unknown duration or more than 10 minutes are rejected.
The 192 MiB, sample, or channel limit is exceeded.
Use fewer or shorter clips, and prepare mono or stereo inputs. Different decoded sample rates require resampling separately.
How to interpret the result
Compare output duration with the sum of input durations and verify playback order.
Related workflow
Mono sections in stereo output have identical left and right channels. Listen to the downloaded WAV before any separate volume or fade edits.
Privacy and review notes
Audio is decoded locally. Keep originals and check permission to share the recordings; concatenation does not anonymize voices or remove sensitive speech.
FAQ
Does this automatically smooth the joins?
No. It performs end-to-end concatenation, not simultaneous mixing, automatic crossfade, or loudness normalization. Listen for clicks and volume changes.
How large is a one-second plus two-second output?
If both decode at 48,000 Hz mono into 144,000 total frames, PCM16 data is 288,000 bytes and the WAV with its 44-byte header is 288,044 bytes. Other sample rates or channel counts change that size.