Volume Booster
Normalize volume, automatically lift quiet audio, or apply a direct gain boost.
Drop audio here or click to choose
Supports common audio formats and batch processing.
KikiVoice provides audio volume 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 files or large files depend on your device and browser.
Over 200,000 creators trust kikivoice for their cloning needs.
Normalize and boost audio volume online
The Volume Booster helps adjust audio loudness. Use Normalize to bring files to a standard listening level, Smart Boost to make quiet audio louder automatically, or Boost to apply a selected gain increase.
What the volume tool does
- Normalize audio volume to a standard listening level for speech, narration, lessons, calls, demos, and other recordings.
- Use Smart Boost when a file is too quiet and you want an automatic loudness lift with peak limiting.
- Use Boost when you want to increase volume by a selected amount.
How to normalize or boost audio volume
Upload one or more audio files, choose Normalize, Smart Boost, or Boost, select an output format, and download the processed files. Normalize uses a standard target level, so it may raise quiet audio or reduce audio that is already too loud.
What can this audio volume booster help you with?
Volume Booster adjusts the loudness of existing audio files: how loud they sound when played. Try Smart Boost or direct Boost when a recording is too quiet to hear at your normal playback volume. Try Normalize when recordings made at different times or on different devices sound uneven, so their loudness can become closer.
Processing creates a new audio file you can download. It does not directly turn up your computer, phone speaker, or another webpage. Louder audio is not necessarily cleaner audio. Background sounds may also become louder, and missing content, crackles, or existing distortion will not be restored.
How do I make a recording easier to hear and save the result?
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Choose the audio you want to adjust
Click the file selection area above to add one or more audio files, or drag files in. Check that your originals play normally first. A filename appearing in the list only means the file was selected. Reading and loudness processing happen after you start processing.
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Choose a mode for your task
Options is expanded automatically when you add the first files to a new list. Choose a processing mode, or use Hide Options if you want to collapse the panel. Normalize is the default and suits recordings whose loudness you want to bring closer. Smart Boost adjusts loudness automatically. Boost increases volume directly and shows the amount selector. Start with a short recording, then listen before deciding whether to change mode or amount.
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Choose an output format if needed
The default output is Keep original format, which creates a new file using the source filename extension and still re-encodes the audio. The output options shown after adding files also let you choose a listed format such as MP3 or WAV. There are no bitrate, sample rate, channel, or custom professional loudness target controls.
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Click Process All and wait for each item
The tool processes list items one at a time and creates a separate result for each file. It does not join them into one recording. Keep the page open and check each item's progress and success or error status. Clicking Process All again reruns the whole list, rather than only retrying failed items.
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Compare Original and Processed, then download
After an item succeeds, click its Preview button to open the player, then click Play. Switch between Original and Processed to compare them. Click the item's Download button when the sound suits your task. Download All saves completed files separately. Save the results you need before leaving or clearing the page.
Loudness controls for different tasks
Choose the goal before choosing a mode
Normalize focuses on bringing recordings closer in loudness, Smart Boost adjusts loudness automatically, and Boost increases volume directly. The first two adjust according to the source, so the result is not always louder than the original. A recording that is already loud may become quieter.
Choose an amount for direct Boost
In Boost mode, choose 150%, 200%, 300%, 400%, or 500%. The default is 200%. These are processing amounts, not a promise that the sound you hear will double exactly. Stronger boosting is not guaranteed to sound comfortable.
Process several files and save each result
Add several recordings and process them in sequence with the selected mode and output settings. Each item has its own status, preview, and download link. Batch processing does not combine the content or guarantee identical tone, background sound, or listening experience across different sources.
Keep the source extension or choose eight output formats
Alongside Keep original format, choose MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or AIFF. These are output choices, not a complete list of compatible inputs. A format being listed does not guarantee that every source file can be processed.
Compare the original and result after processing
The preview panel offers Original and Processed choices so you can check the sound and whether background noise is more noticeable. Switching the preview does not change the download, which always contains the processed result. The preview may be converted to WAV for browser playback, so its format may differ from the download.
Which recordings might benefit from a loudness adjustment?
Quiet interview speech or voice memos
When the original plays normally but speech is too quiet, try a gentle adjustment first. Compare whether voices are easier to hear and whether air conditioning, environmental sounds, or background hiss have also become more noticeable.
Lesson or explanation clips recorded at different times
If some recordings are loud and others quiet, try Normalize on each to bring their loudness closer. They remain separate files. Listen to every result before publishing or continuing to edit, rather than assuming the same mode makes them sound identical.
Check narration or podcast sources before delivery
Adjust noticeably quiet narration, dialogue, or podcast clips, then check them on the actual playback device. If the recipient has specific format or loudness requirements, verify the downloaded files. This page has no controls for custom professional loudness targets.
Phone recordings of everyday moments or distant speech
When a distant voice was recorded but is difficult to hear, loudness adjustment can be one step in preparing the recording. Increasing volume cannot recover words that were not recorded or repair audio that is already broken, interrupted, or damaged.
What should I check before processing and downloading?
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More loudness does not mean less noise
Increasing volume may make voices and background sounds more noticeable together. This page does not provide audio noise reduction, speech generation, or distortion repair. Listen first if the source has hiss, crackles, or harsh sounds, then choose less boost or prepare a cleaner source.
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Percentages are not exact multiples of perceived loudness
The Boost amount is a processing setting. How loud the result sounds also depends on the source, playback equipment, and sound changes during processing. Start with a lower amount and compare instead of choosing the highest setting immediately. Existing distortion will not be repaired by more volume.
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Normalize and Smart Boost may also make audio quieter
These modes adjust loudness automatically, so an already loud source may become quieter. Batch processing does not remove differences in background sound, microphone distance, or tone between recordings. It does not guarantee that every source meets the same professional delivery standard.
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Keep original format still creates a new file
This option chooses the output from the source extension and still re-encodes the audio. It does not guarantee preservation of the original encoding, bitrate, sample rate, or sound quality. If a source extension cannot be exported, choose a listed output format and try again. The tool does not automatically switch to MP3.
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Compatibility and processing time depend on your environment
A source may be damaged or unreadable, and longer or larger files may need more memory. Check the original, test a short recording, and close tabs you do not need. Check your connection and try again if processing resources fail to load. Local browser processing does not mean fully offline use.
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Process again after changing mode, amount, or format
Changing these settings clears the current list's processed results and previews. Click Process All again to rerun the whole list, not only unfinished items. If an item fails, check its message and source before deciding to process again or remove it.
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Download All saves separate files; save before clearing
Download All downloads completed results one by one. It does not create a ZIP or join the audio, and your browser may ask you to allow multiple downloads. Confirm that files are saved before clearing, refreshing, or leaving the page. Page results are not an automatically saved cloud history.
How does Volume Booster relate to KikiVoice's AI voice features?
KikiVoice offers AI Voice Cloning for voice cloning, AI Voice Design for voice creation, Text to Speech for turning text into speech, and AI Voice Changer for voice transformation. These features serve different voice creation tasks.
Volume Booster is a separate free audio loudness tool for existing files. It does not generate narration, provide voice cloning or AI voice changing, or automatically turn a recording into clean speech. Choose the relevant KikiVoice feature when you need those other capabilities.
Frequently Asked Questions
How do I normalize audio volume online?
Upload the audio file, choose Normalize, and process the file. The tool adjusts loudness toward a standard listening level, which can make quiet audio louder and overly loud audio more controlled.
What is the difference between Normalize, Smart Boost, and Boost?
Normalize balances audio toward a standard listening level. Smart Boost automatically makes quiet audio louder while limiting peaks. Boost applies a direct gain increase based on the amount you choose.
Can I normalize or boost volume for several files at once?
Yes. Add multiple audio files, choose the volume mode and output format, then process the list.
Can increasing volume fix distorted audio?
No. If the source audio is already clipped or distorted, making it louder may make the distortion more obvious. Try a smaller boost amount or use a cleaner source file.
Are audio files uploaded to KikiVoice servers?
Audio files are not uploaded to KikiVoice servers. Core loudness processing runs in your browser on your device. Page scripts and processing resources may still load over the network, so local processing does not mean fully offline use. The experience with multiple files or large files depends on your device and browser.
Can this directly turn up speakers, other webpages, or videos?
This page processes audio files you choose from your device and creates new results you can download. It does not change your computer or phone's system volume, or directly control playback volume in other browser tabs or online videos.
Why is the boost percentage selector sometimes hidden?
The amount selector appears only in direct Boost mode. It offers 150%, 200%, 300%, 400%, and 500%, with 200% as the default. Normalize and Smart Boost adjust loudness automatically and do not use this percentage control. The percentage is not an exact multiple of perceived loudness.
Why is background noise more noticeable after increasing volume?
Loudness processing affects the existing recording, and background sounds may become louder along with speech. This page does not provide noise reduction. Try Audio Noise Reducer in the related tools section if environmental noise or hiss is the main problem. Listen and compare afterward; removing every noise is not guaranteed.
Does Keep original format preserve all original settings, and which other outputs are available?
It does not guarantee preservation. Keep original format creates a processed result using the source filename extension and still re-encodes the audio. The original encoding, bitrate, sample rate, and sound quality are not guaranteed to stay the same. In the options displayed after adding files, you can choose MP3, WAV, M4A, AAC, FLAC, OGG, Opus, or AIFF. Use Hide Options to collapse the panel or Options to show it again. These output choices do not guarantee compatibility with every input.
How do I compare Original and Processed, and does switching change the download?
After an item succeeds, click Preview to open the player, then click Play. Switch between Original and Processed to compare them. Switching only changes the preview; downloads always contain the processed result. The preview may be converted to WAV for browser playback, so its format may differ from the downloaded file.
Why do some files fail or take a long time, and how do I retry?
An incomplete source, an input or output the current processing cannot handle, or limited device memory may cause failure or long waits. Check that the original plays normally and test a short recording. Check your connection and retry if resources fail to load. Clicking Process All again reruns every list item, not only failed ones.
Why do preview and download links disappear after changing mode, amount, or format?
These changes invalidate the current list's old results so you do not download a file made with different settings. Click Process All again, then preview and download after processing succeeds. Download the current version to your device before changing settings if you want to keep it.