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To make an audio file louder, raise its gain or use peak normalization. If you need it to meet a specified perceived-loudness target, use loudness normalization instead. If loud peaks keep quiet speech from becoming audible, compress the audio first, then add gain. Export a copy and listen for clipping or unwanted changes.
Choose a method based on what you want to change
| Method | What it measures or changes | Best for |
|---|---|---|
| Amplify or peak Normalize | Raises the whole selection by one gain amount, based on its loudest peak. It does not change the relative gap between quiet and loud parts. | A straightforward level increase when the file has room below the peak ceiling. |
| Loudness Normalization | Measures perceived loudness and applies one gain amount; it preserves the file’s dynamics. | Meeting a stated loudness target or making multiple tracks more comparable in perceived level. |
| Compression, then gain | Reduces the difference between loud and quiet sections before raising the output level. | Quiet speech or other material whose loud peaks limit how much the whole file can be raised. |
| Limiting | Controls high peaks so the output can be raised while keeping those peaks in check. | Peak control in a final voice or dialogue workflow; it still requires listening. |
1. Raise the whole file with Amplify or peak Normalize
Amplify and peak Normalize apply a gain change to the selected audio. In Audacity, Normalize brings the selection’s loudest peak to a chosen level; it does not make every passage equally loud or match perceived loudness. The Audacity Normalize manual describes a default peak target of −1 dB, which leaves headroom and is safer than targeting above 0 dB, particularly if the audio will later be encoded to a lossy format.
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- Open a copy of the file in Audacity and select the track or region you want to change.
- Choose Effect → Volume and Compression → Normalize. Menu labels can vary between versions; if the path differs, look for Normalize in the Effects menu.
- Set a peak target that leaves headroom, then preview or listen to the result. Avoid setting a target above 0 dB.
- Export the processed audio as a new file so the original remains unchanged.
A single gain change raises quiet and loud passages together. If the loudest peak is already close to the ceiling, there may be little safe room to raise the rest of the file this way.
2. Use loudness normalization to reach a perceived level
Peak level and perceived loudness answer different questions. Peak normalization targets the highest point in the audio; loudness normalization measures how loud the selection sounds and adjusts it to a chosen target. Audacity’s tool offers perceived-loudness measurement in LUFS as well as RMS measurement in dB. Use loudness normalization when a delivery specification names a loudness target, or when you want separate tracks to sound more comparable. See the Audacity Loudness Normalization manual.
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- Select the audio and open Effect → Volume and Compression → Loudness Normalization. The exact menu path may differ by Audacity version.
- Choose LUFS if the destination specifies perceived loudness in LUFS; follow that destination’s current delivery requirements for the target.
- For ordinary stereo material, leave the option to normalize stereo channels independently turned off. Audacity warns that independent correction can change the left-right balance; it is intended for genuinely separate recordings in each channel.
- Apply the effect, listen to the result, and export a new copy.
Audacity cites −23 LUFS as the EBU R 128 target and a reasonable default for spoken-word audio intended for broadcast. That is a broadcast reference, not a universal streaming or personal-listening setting; use the target specified for your intended destination.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.3. Make quiet parts more audible with compression, then add gain
If a few loud peaks prevent a large overall boost, compression can reduce the loud-to-quiet difference. A compressor turns down audio above its threshold, making quiet portions relatively more audible once you raise the output. Because that changes the dynamics—and therefore the sound—use it only when that trade-off helps. Audacity explains the distinction in its Volume and Compression guide and describes the threshold and make-up gain workflow in its compressor instructions.
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- Select the passage or track and apply compression, adjusting it for the material rather than assuming one setting suits every recording.
- After compression, raise the output with make-up gain or normalize it. Compression alone is not the same as making the final file louder.
- Listen for unnatural pumping, harshness, flattened dynamics, or distortion. Back off the processing if you hear unwanted changes.
A limiter is another option when peaks need control as you raise output. Audacity documents a voice-over limiter preset for dialogue and podcasts in its Limiter manual. A limiter is not a guaranteed transparent fix: check the processed audio and reduce the effect if it sounds harsh or overly flattened.
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How to avoid clipping and unwanted changes
- Keep peak headroom instead of aiming above 0 dB; Audacity’s Normalize default is −1 dB.
- Remember that peak normalization matches the highest peak, not perceived loudness.
- Use compression only when reducing the loud-to-quiet gap is worth changing the dynamics.
- For stereo recordings, do not normalize left and right channels independently unless they are genuinely separate recordings.
- Export a new file and listen to it. No single target or effect is right for every recording and destination.
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