Normalize loudness and fade audio
Balance a recording’s loudness and add a gentle fade. Use Normalize loudness and fade audio locally with practical instructions, output settings and format limits.
Normalize loudness and fade audio
Create a short audio copy with a chosen loudness target and optional fades at the beginning or end. Select the segment before setting fades, then choose a supported audio format. Use it to prepare clearer transitions or more consistent listening levels, with a final listening check for the specific recording.
- Apply a fade to a short music excerpt
- Prepare a voice clip at a chosen loudness
- Soften the start and end of an audio sample
How to use Normalize loudness and fade audio
Choose an audio segment
Upload one supported recording and enter start and length. The selected segment can be up to 120 seconds and defines the available space for fades.
Set loudness and fades
Choose the loudness target in LUFS, then enter fade-in and fade-out durations. Each fade must be no longer than the selected clip’s duration.
Select the output encoding
Choose the audio format and bitrate where relevant, then run the tool. The loudness filter and requested fades are applied before the result is encoded.
Listen at a normal level
Download the output and listen through both ends and louder passages. Check that fades do not hide words and that the perceived level suits the recording’s destination.
Understand the settings
- Output format
- Choose output format according to the result you need. Available choices: MP3; WAV; FLAC; OGG; M4A; AIFF. The initial selection is MP3.
- Bitrate (kbps)
- Bitrate (kbps) accepts values from 32 to 320, using whole numbers. The initial value is 128. Change it for a specific output requirement, then check the result before processing more files.
- Start (seconds)
- Start (seconds) accepts values from 0 to 7200, in increments of 0.1. The initial value is 0. Change it for a specific output requirement, then check the result before processing more files.
- Length (seconds)
- Length (seconds) accepts values from 0.1 to 120, in increments of 0.1. The initial value is 20. Change it for a specific output requirement, then check the result before processing more files.
- Loudness (LUFS)
- Loudness (LUFS) accepts values from -30 to -5, using whole numbers. The initial value is -16. Change it for a specific output requirement, then check the result before processing more files.
- Fade in (seconds)
- Fade in (seconds) accepts values from 0 to 30, in increments of 0.1. The initial value is 0. Change it for a specific output requirement, then check the result before processing more files.
- Fade out (seconds)
- Fade out (seconds) accepts values from 0 to 30, in increments of 0.1. The initial value is 0. Change it for a specific output requirement, then check the result before processing more files.
A smoother music excerpt
A twenty-second music sample needs gentle edges for a presentation. Choose the segment, set a loudness target of minus sixteen LUFS and add one-second fades. Export the audio and listen to the opening, loudest passage and ending before inserting it.
Check your result
Upload a file, adjust settings and run the tool. All processing uses the local engine. Media jobs are bounded to 120 seconds; animations to 240 frames, 30 seconds and 64 million decoded pixels. Open the saved output in the app or workflow where you plan to use it. Check one representative result before repeating the same settings with more files. The original files stay unchanged.
What to know before you start
- Files are processed on this device. Browser memory and engine-specific limits apply. Save results before reloading.
- Media jobs are bounded to 120 seconds; animations to 240 frames, 30 seconds and 64 million decoded pixels.
- Upload one file with a combined size of at most 100 MB. The completed output must fit within 200 MB.
- Files are checked by the local engine; a matching filename alone is not proof of valid contents.
- Selections and completed jobs stay available while you navigate inside this tab. Use My files to revisit results. Reloading or closing the tab clears the workspace; download results you want to keep first.
Normalize loudness and fade audio: common questions
What does LUFS control?
LUFS is a measure used for perceived programme loudness. The target guides the normalization filter, while the source content and encoding still affect the finished listening experience. Review the output instead of assuming one value suits every destination.
Can a fade be longer than the clip?
No. Each fade duration must fit within the selected audio segment. Choose the excerpt first and then set fades that leave enough unaffected content, especially when the clip contains a short spoken sentence.
Does normalization remove background noise?
No. Loudness normalization changes level according to the filter’s analysis and target. It is not a noise-removal or speech-restoration process, so unwanted background sound can remain audible or become more noticeable after level adjustment.
Is this a broadcast compliance certificate?
No. The tool creates a normalized audio file using its configured filter and settings. It does not provide a standards compliance report; assess the destination’s requirements separately and use appropriate measurement when a formal delivery specification applies.
Does Normalize loudness and fade audio upload files to another service?
Processing runs in this browser, on your device. Files and pasted input are not uploaded to a conversion server. The website and required engine assets must load first; large operations depend on available device memory.
Can I continue after changing pages?
Selections and completed jobs stay available while you navigate inside this tab. Use My files to revisit results. Reloading or closing the tab clears the workspace; download results you want to keep first.