Audio Fade Curve Editing Tool

Add professional fade-in and fade-out effects to audio, with support for four curve types, real-time preview, and batch processing.

Bug report

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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If the online tool fails to load or run, try the desktop tool.https://tools.yikeaigc.com/

Tool Usage

Return to old version

Select audio and set curve parameters before processing. All batch files will be processed. Only the first 20 are shown for review. Output filenames use the original names by default; duplicates get numbers automatically.

Waiting to load local processing core

Import Audio

Supports common audio formats like MP3, WAV, FLAC, M4A, AAC, OGG, OPUS, WMA, AIFF, AMR, and more.

Click to select audio, or drag files here No server upload needed. Processing is done on this device.

Review the file list first, then set curve parameters.

File Review

Only the first 20 files are shown. All selected files are included when processing and downloading the ZIP.

File Count

0 KB

Total Size

Shown

Hidden

Select audio files, or load a sample to view the workflow.

Fade Parameters

Start by previewing 1 to 3 seconds, then fine-tune for music, speech, intros, or outros.

Fade-in Time

2.0 sec

Fade-out Time

2.0 sec

Output Format

Lossy format bitrate

Sample rate

Channels

Use the same curve for fade in/outTurn off to set separate curves for each end Loudness normalizationBest for batches with large volume differences Peak protectionAdd a limiter at the end to reduce clipping risk Keep audio tagsTry to keep title, artist, album, and other info ZIP compressionUse compression for the download package Generate processing reportLog settings, successful files, and failure reasons

ZIP file name

Curve editor

After choosing a curve, the preview on the right updates. Exponential, logarithmic, and S-curve suit more natural volume changes.

Fade-in curve Linear

Fade-out curve Linear

Envelope preview Fade in 2.0s / fade out 2.0s

Preview, process, and download

Generate a preview for the first audio file first, then batch process and download the ZIP.

Pending0 items

Output FormatMP3

CurveLinear

Results0 items

Original audioWaiting for file

Effect previewNot generated

Set parameters first, then start processing.

Instructions

Software Usage Instructions

Select audio files: Click the “Select Audio” area and choose the audio files you want to process. Batch selection of common formats such as MP3, WAV, FLAC, M4A, AAC, OGG, and OPUS is supported.
Confirm the file list: The tool will display the first 20 files for review. If there are more than 20 files, not all of them will be shown, but all selected files will be included during processing and downloading.
Set fade-in and fade-out duration: Go to the “Set Curve” step and adjust the fade-in duration and fade-out duration separately. Shorter durations can be used for speech, while music intros and outros can be extended as needed.
Select the curve type: You can choose from curves such as Linear, S-curve, Quadratic, Cubic, Exponential, Logarithmic, Equal Power, Smoothstep, and Sine, and view the trend in the envelope graph.
Set output parameters: Choose the output format, bitrate, sample rate, and channels. You can also enable options such as loudness normalization, peak protection, preserving audio tags, and generating a processing report.
Save settings: After clicking “Save Settings,” the current curve and output parameters will be saved locally and can be reused the next time you open the tool.
Generate a preview: Go to the “Preview & Download” step and click “Generate Preview” to listen to the fade-in and fade-out effect on the first audio file.
Start processing audio: After confirming the effect, click “Start Processing Audio,” and the tool will process all files using the current parameters.
Download results: After processing is complete, you can preview the first 20 results. Click “Download All Results ZIP” to download all processed audio files. If file names are duplicated, numbers will be automatically added after the file names to distinguish them.

FAQ

A: The Linear curve changes evenly and is suitable for speech and short clips; S-curve, Sine, and Equal Power curves provide smoother transitions and are suitable for music intros and outros; Exponential and Logarithmic curves create more layered volume changes and are suitable for scenarios that need a noticeable fade-in or fade-out.

A: Speech recordings can usually be set to 0.3 to 1 second, music intros to 1 to 3 seconds, and outro fade-outs to 3 to 8 seconds. It is recommended to generate a preview first, then adjust based on the rhythm of the content.

A: Yes. After selecting multiple audio files at once, the tool will process all files using the same fade-in and fade-out settings, then package the results as a ZIP for download. The interface only displays the first 20 files for review.

A: By default, the original file name is kept, and only the extension is replaced according to the output format. If multiple results have the same name, the tool will automatically add a number after the file name to avoid overwriting.

A: This option tries to use the original audio file’s extension as the output format. If the original format is not suitable for output, the tool will automatically use a more compatible audio format.

A: Loudness normalization can make audio files with large volume differences sound more consistent; peak protection limits excessively high peaks at the end of the processing chain, reducing the risk of clipping distortion.

A: Common causes include corrupted files, nonstandard encoding, files that are too large, insufficient device memory, or limited format compatibility. You can try reducing the number of files processed at once, or first converting the audio to common formats such as MP3 or WAV before processing.