---
title: "Audio Pad"
description: "Add leading and trailing silence to an audio clip, pad it up to a minimum length, and resample it (default 48 kHz stereo). Built for reference-audio prep: Seedance @Audio wants the voice to start at 0.5s, a clip of at least 1.8s, 48k stereo, which is lead 0.5 + minimum duration 1.8 with the defaults. The minimum counts the lead and the tail. Free: deterministic processing, content-addressed output."
updated: 2026-09-28
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# Audio Pad

**Node type:** `utility:audio_pad`  
**Category:** `Editing`

## Description

Add leading and trailing silence to an audio clip, pad it up to a minimum length, and resample it (default 48 kHz stereo). Built for reference-audio prep: Seedance @Audio wants the voice to start at 0.5s, a clip of at least 1.8s, 48k stereo, which is lead 0.5 + minimum duration 1.8 with the defaults. The minimum counts the lead and the tail. Free: deterministic processing, content-addressed output.

## Canvas ports

These appear as port handles on the left side of the node.

| ID      | Label     | Details              |
| ------- | --------- | -------------------- |
| `audio` | **Audio** | `AUDIO` _(required)_ |

## Sidebar config

These render as form fields in the right-side config panel when the node is selected.

| ID            | Label                                  | Details                                             |
| ------------- | -------------------------------------- | --------------------------------------------------- |
| `lead`        | **Lead silence (s)**                   | `NUMBER`                                            |
| `tail`        | **Tail silence (s)**                   | `NUMBER`                                            |
| `minDuration` | **Minimum duration (s; blank = none)** | `NUMBER`                                            |
| `sampleRate`  | **Sample rate**                        | `TEXT` · options: `48000`, `44100`, `24000`, `keep` |
| `channels`    | **Channels**                           | `TEXT` · options: `stereo`, `mono`, `keep`          |
| `format`      | **Format**                             | `TEXT` · options: `mp3`, `wav`                      |

## Outputs

| ID      | Label            | Type    |
| ------- | ---------------- | ------- |
| `audio` | **Padded Audio** | `AUDIO` |

## What it is for

Reference-audio prep in one node. Seedance's @Audio reference wants the voice
to start at 0.5s, a clip of at least 1.8s, 48 kHz stereo. Set **Lead** to 0.5
and **Minimum duration** to 1.8; the 48 kHz stereo default does the rest.

## Settings

- **Lead silence** (seconds, 0 to 30): silence before the audio.
- **Tail silence** (seconds, 0 to 30): silence after it.
- **Minimum duration** (seconds, blank = none): pads the end until the whole
  file is at least this long. It counts the lead and the tail. A clip already
  longer is left at its length, never cut.
- **Sample rate**: 48000 (default), 44100, 24000, or keep.
- **Channels**: stereo (default), mono, or keep. Mono sources are duplicated to
  both channels.
- **Format**: mp3 (default) or wav.

Out-of-range values are refused with the number, never clamped.

## Free, and why

Free set, no Run button, refreshes when anything downstream runs. The output is
content-addressed, so an unchanged re-run reuses the last file.

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_Auto-generated from the Wireflow node registry._

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