Web Standard: Audio files Use MP3

Definitions:

  • Audio files play sound.
  • There are no images.
  • Max file size limit is 1000MB.
Related Content

Content Requirements:

  • Audio files should be in MP3 format only, technology agnostic, playable in the browser.  This means you should not use proprietary formats such as AIFF or WAV.
  • Include a transcript to meet 508 requirements. (The WebCMS will prompt you to add the transcript when uploading your audio file.) 
    • Transcripts should be text files only. 

Examples:

Public Service Announcements about Emergencies and Disasters

About this Standard

All EPA public web content must adhere to all federal requirements including; the EPA Web Standards, the U.S. Web Design System guidelines, federal plain language guidelines, and the 21st Century Integrated Digital Experience Act. Internal content, including Intranet and Microsoft 365, may differ from the public content. If not explicitly stated, content must adhere to all federal requirements.

Original effective date: 02/8/2023
Last approved on: 02/8/2026
Web Council review by: 02/8/2026 (or earlier if deemed necessary by the Web Council)

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Last updated on February 19, 2025