---
title: "Creative Specifications - Audio"
slug: "creative-specifications-audio"
updated: 2025-01-03T17:52:38Z
published: 2025-01-03T17:52:38Z
canonical: "help.quantcast.com/creative-specifications-audio"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.quantcast.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Creative Specifications - Audio

## Creative Specifications for Audio

The specifications for uploading an audio creative on the Quantcast platform are as follows:

### **Length**

Fifteen (15) second and Thirty (30) second lengths are recommended. We advise running both 15- and 30-second Audio ads for the maximum scale and best results.

- :15 sec will run on :15 sec ad slots
- :30 sec will run on :30 sec ad slot

Please reach out to Quantcast Support for more details.

### **File Format**

- 3rd party ad serving tags
- VAST 2.0/3.0/4.0

### **Audio Hosted**

- .mp3 .mp4 .wav .ogg .mpeg or .m4a are supported

### **Max File Size**

- 50 MB max for third-party creative tag sheets
- 20 MB max for Quantcast-hosted single audio creative

### Companion Banner Ads

We currently support third-party hosted companion banner audio ads. Please reach out to your Quantcast contact for assistance.

We will soon be supporting Quantcast-hosted companion banner audio ads.