音声の音量を無料でオンラインで上げる方法
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easytools24の音量ブースターで無料でオンラインで音声の音量を上げられます。MP3や音声ファイルをアップロードし、希望の量だけ音量を上げて増幅バージョンを即座にダウンロード。すべてブラウザ内で処理されます。
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What Is Audio Volume Boosting?
Audio volume boosting increases the overall loudness of an audio file. The process amplifies the audio signal, making quiet recordings louder and more audible without changing the speed, pitch, or quality of the audio.
Volume boosting is different from normalization (which adjusts to a target peak level). Boosting applies a uniform gain increase across the entire audio file, making everything proportionally louder.
Why Boost Audio Volume?
Quiet audio files are a common frustration:
1. Quiet Recordings
Recordings made with a microphone too far from the source, or in noisy environments, often come out too quiet. Boosting the volume makes the speech or music audible at normal listening levels.
2. Inconsistent Volume Across Tracks
When playing a playlist of songs from different sources, some tracks may be significantly quieter than others. Boosting the quiet tracks creates a consistent listening experience.
3. Presentation and Lecture Audio
Recorded presentations, webinars, and lectures are often recorded at low volume. Boosting them before sharing ensures attendees can hear every word without maxing out their device volume.
4. Podcast Post-Production
Guest recordings in podcasts may come in at different volume levels. Boosting quieter segments ensures consistent audio quality throughout the episode.
How to Boost Audio Volume — Step-by-Step Guide
Make your audio louder in seconds:
Step 1: Open the Audio Volume Booster
Navigate to the Audio Volume Booster tool in any browser. No installation or account required.
Step 2: Load Your Audio File
Drag and drop your MP3, WAV, or other audio file into the tool. The file loads locally in your browser — it is never uploaded to any server.
Step 3: Set the Volume Increase
Adjust the volume boost slider to your desired level. A moderate increase (50-100%) is usually sufficient for quiet recordings. Preview the boosted audio before downloading.
Step 4: Download the Louder Audio
Click boost and download your volume-enhanced audio file. The original file remains unchanged on your device.
Volume Boosting Tips
Avoid Over-Boosting
Boosting too much causes audio clipping — a distorted, crackling sound at loud points. Increase volume gradually and preview the result to avoid clipping artifacts.
Remove Noise First
If your recording has background noise, use the Audio Noise Reduction tool before boosting volume. Boosting amplifies everything, including unwanted noise.
Test on Different Devices
After boosting, play the audio on your phone, laptop, and headphones to confirm it sounds good across devices. What sounds fine on headphones may clip on phone speakers.
Common Use Cases
Volume boosting is used by:
- Podcasters normalizing guest audio to match host levels
- Teachers making lecture recordings audible for all students
- Musicians increasing the volume of demo recordings
- Professionals boosting quiet conference call recordings
- Content creators enhancing voiceover audio for videos
- Anyone making phone recordings loud enough to share