Audio Mixer
Add multiple tracks, adjust timing and tone, then export one mixed audio file.
Drop audio files here or click to add tracks
KikiVoice provides mixing tools and processing algorithms that run in your browser on your device. Audio files are not uploaded to KikiVoice servers.
Processing time and the experience with multiple tracks or large files depend on your device and browser.
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Mix audio tracks online
The Audio Mixer combines multiple audio files into one output file. It can be used to place speech over music, add sound effects, line up separate clips, or make a simple mix without opening a desktop editor.
What the audio mixer does
- Add multiple tracks and control the volume, delay, speed, pitch, trim range, and loop setting for each one.
- Mix voice, music, ambience, effects, short clips, and reference audio into a single file.
- Preview the mixed result before export so you can adjust timing and loudness.
How to mix audio
Add the tracks you want to combine, set the start delay and volume for each track, preview the mix, then export the result. For a cleaner mix, trim unused silence first and keep the source files at a similar loudness.
What can this audio mixer help you do?
Mixing puts several sounds into one finished audio file, where they can overlap at the times you choose. For example, place narration over background music or make a notification sound appear during speech. A track here is one file you add, which you can listen to and adjust separately.
Audio Mixer works with audio you have already prepared. Choose a section of each track, adjust its volume and start time, then export one mixed file. If you want the first clip to finish before the next begins, use Audio Joiner for sequential joining. The order of the track list does not automatically make tracks play one after another here.
How do I mix several sounds together?
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Add the audio files you want to combine
Click the file selection area above to add voice, music, or sound effects, or drag files into it. Each file appears in its own track card. Check that it has loaded successfully before adjusting it.
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Listen to a track and choose the section to keep
Click Play on a track to check its content. If you only need part of it, drag the handles at the ends of that track's waveform. Each track keeps one continuous range. Leave the full file selected if you do not need to trim it.
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Adjust volume and start time
Each new track's Settings panel starts expanded. For example, lower the background music so speech is easier to hear. Enter a delay in seconds for the narration if you want the music to play first. Delay accepts decimal values and affects only that track. Use the track's Settings button to collapse or reopen its controls.
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Adjust speed, pitch, or loops if needed
Speed controls how fast the track plays, pitch controls how high or low it sounds, and loops repeat the selected section. Keep the defaults if you are unsure. Use Mute to temporarily leave a track out of the mix, and check which tracks you want included before exporting.
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Preview, choose a format, then export and download
Click Preview in Mixed output and wait for processing before listening. Output options are expanded automatically when you begin a new track list, so you can check the format and its settings before exporting. The default is 192 kbps MP3. Use Hide Options if you want to collapse this panel. When the result sounds right, click Export, then Download Mixed Audio when the link appears. Changes to tracks or output settings require the current result to be processed again.
How can I adjust each track?
Set volume and start time separately
Each track has its own volume and delay. Make music quieter, bring speech forward, or make a notification sound start later. Choose these settings for your task. The tool does not automatically align the content for you.
Adjust speed, pitch, and repeat count per track
Use a track's own settings to make it faster, slower, higher, or lower. Loops repeat the selected section. These controls are not AI composition or voice cloning. Listen to the actual result after changing speed or pitch.
Choose a section to keep on the waveform
The left and right handles choose one continuous section of each track for the mix, which helps remove an unwanted beginning or ending. This is not a timeline editor for cutting one file into many pieces and freely moving, deleting, or joining them.
Use track playback and mute to check sounds
Play helps you hear one source track, while Mute leaves it out of the current mix. Muting does not delete the source file, and you can use it again after unmuting. Mute affects both the mixed preview and export, so it is not just a listening switch.
Preview and export the current mix
Mixed output provides preview and export controls. Its options start expanded after adding the first tracks. Choose MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or AIFF and check the settings available for that format. These are output choices and defaults. They do not guarantee that every source file can be processed or that sound quality will improve automatically.
Sound combinations you can try
Add background music to existing narration
Add speech and music separately, keep speech easy to hear, and lower the music volume. Give the speech a delay if you want a musical opening. Bring your own source files. This page does not generate narration or provide a music library.
Add notification sounds to a podcast or spoken piece
Put the main speech and short notification sounds on separate tracks. Set each sound's delay and check its volume. If your intro, main content, and ending should play one after another, use a joining tool instead.
Draft the audio for a video project
Layer prepared narration, music, and sound effects. Listen to how they work together, then download the mix for later editing. This page exports audio. It does not place it into a video automatically or sync with video editing software.
Prepare audio for a lesson or product introduction
Make the explanation the main sound, then add opening music or notification sounds as needed. Adjust each volume so music does not cover the content, and use delay to place sounds. Try shorter source files to check the settings before processing the full piece.
What should I check before mixing and exporting?
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Check that each source file can be read
If a file will not load, check that it is complete and plays normally on your device, then test a shorter file. Files with the same extension can store audio differently, so not every file is guaranteed to work in your current browser.
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Check mute and volume if a track is missing
If you cannot hear a track in the mix, check whether it is muted, its volume is zero, or its delay means it has not started yet. Play that track separately to check its source content and selected range, then return to the mixed preview.
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Trim selects a section; delay chooses when it starts
The waveform handles select a continuous section from the file. Delay sets when that section starts in the finished mix. These are different actions. They do not automatically join files in list order or find the best place for speech or music.
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Raising volume cannot repair noise or distortion
Check the original source if audio is too loud, noisy, or already distorted. Avoid simply turning every track up. Balance the main and background sounds, then listen. This page does not offer dedicated noise reduction, echo removal, or mastering.
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More tracks, longer files, and more loops can take longer
The browser processes the tracks before creating the finished file. More tracks, longer sources, or higher repeat counts may need more time and memory. This page does not promise unlimited tracks or an unlimited-duration output. Test important work with short sources first, and keep the page open while processing.
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Choose output settings for the recipient's needs
Output options are shown by default when you begin a new track list and can be collapsed with Hide Options. Check the output format and settings available for that format. The default 192 kbps MP3 is not a promise of lossless audio or compatibility with every player. Check the download in the software you intend to use. Changing formats cannot restore details already lost from the source.
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Local browser processing may still need resources to load
Initial processing or preview may need page scripts and processing resources to load. This does not mean fully offline use. If resources fail to load, check your connection and retry. Available memory, file compatibility, and processing time may also differ across phones, tablets, and desktop devices.
How does the mixer relate to KikiVoice's AI voice features?
KikiVoice's voice creation features include AI Voice Cloning for cloning a voice, AI Voice Design for designing voices, Text to Speech for turning text into speech, and AI Voice Changer for changing voices. Each serves a different voice creation or transformation task.
Audio Mixer is a separate free audio mixing tool for combining and adjusting prepared source files. It has ordinary pitch and speed settings but does not offer AI voiceover generation, voice cloning, or the AI Voice Changer product's features. Choose the relevant tool depending on whether you want to mix existing audio or create a new voice.
Frequently Asked Questions
How do I add background music to an audio file?
Add your main audio as one track, add the background music as another track, then lower the music volume so the main audio remains clear. Preview the mix before exporting.
Can I make a voiceover play later than the music?
Yes. Use the delay setting on a track to control when it starts. This is useful for intros, voiceovers, sound effects, and clips that need to enter later.
Can I adjust the volume of each track separately?
Yes. Each track has its own volume setting, so you can balance voice, music, ambience, and effects before exporting the final mix.
Can I preview the audio mix before downloading it?
Yes. Use Preview Mix to listen to the current track settings. If the timing or loudness is not right, adjust the tracks and preview again.
What is the difference between Audio Mixer and Audio Joiner?
Mixer layers tracks at their chosen start times, which suits voice over music or notification sounds during speech. Joiner makes files play one after another. The file list here does not automatically join tracks in sequence. For that result, use Audio Joiner from the related tools section above.
What do speed, pitch, and loops mean?
In a track's Settings, speed controls how fast it plays, pitch controls how high or low it sounds, and loops repeat the selected section. These settings affect only that track. The defaults keep the original speed and pitch and play it once. Changes affect the sound and arrangement, so listen first and choose a repeat count that fits your task.
Does Mute affect only the preview or the export too?
Mute leaves that track out of both the mixed preview and final export without deleting its source file. Unmute it if you want it included in the result. Use the track's Play button to check the source on its own, then confirm the mute state before exporting.
Can I trim each track before mixing?
Yes. Drag the handles at the ends of a track's waveform to select one continuous range for the mix. This helps remove an unwanted beginning or ending. It does not delete several middle sections and join the remaining parts of one file. To trim and save one section separately, use Audio Trimmer from the related tools section.
Which formats can I export, and what is the default MP3 bitrate?
The default output is 192 kbps MP3. Output options in Mixed output appear expanded when you begin a new track list. Choose MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or AIFF and check the settings provided for that format. Use Hide Options to collapse the panel or Options to show it again. Default settings do not guarantee lossless audio or compatibility with every recipient's software. Check the actual download.
Are my audio files uploaded to KikiVoice servers?
Audio files are not uploaded to KikiVoice servers. Core mixing runs in your browser on your device. Page scripts and processing resources may still load over the network, so this does not mean fully offline use. Processing time and the experience with multiple tracks or large files still depend on your device and browser.
Why does adding a file fail, or why is mixing slow or export unsuccessful?
A source file may be incomplete or unreadable, there may be no usable unmuted tracks, or long files and multiple tracks may need more device resources. Check the sources and mute states, test shorter files, and close apps or tabs you do not need. If resources fail to load, check your connection and retry. Devices and browsers may perform differently.
Can the mixer remove background noise or generate an AI voiceover?
This page combines existing audio, selects the ranges to keep, and adjusts track settings. It does not provide dedicated noise reduction or AI voiceover generation. Ordinary volume, speed, and pitch settings are also different from AI voice cloning or AI voice changing. Use the relevant KikiVoice AI feature if you want to create or transform a voice.