How to convert WebM to AAC
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
- 2
Convert WebM to AAC
NexMedia converts WebM to AAC on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About WebM
WebM is an open, royalty-free video format developed by Google and based on the Matroska container. It holds VP8, VP9 or AV1 video with Vorbis or Opus audio.
It is made for the web: all major browsers play it in the HTML video element, and it is common for screen recordings and short clips.
WebM allows only its own small set of codecs, so H.264 video or AAC audio has to be re-encoded to fit.
Convert WebM to AAC online free, no account required — AAC is the lossy audio codec that succeeded MP3.
Change WebM to AAC without losing quality — convert WebM to AAC free in your browser.
Why can't I upload my WebM video to Instagram or TikTok? Social apps almost always demand MP4, so a WebM made for the web needs converting before it will upload.
About AAC
AAC (Advanced Audio Coding) is the lossy audio codec standardised in MPEG-2 and MPEG-4 as the successor to MP3; at the same bitrate it generally sounds better than MP3.
It is the audio in most MP4 videos, in Apple Music and on YouTube; a .aac file is a bare AAC stream without a container.
A bare .aac stream has only limited room for tags and cover art, so music players usually expect AAC inside an M4A file.
Why convert music to AAC instead of MP3? At the same bitrate AAC sounds better, and every modern phone, computer and streaming service decodes it.
What changes when you convert WebM to AAC
- The soundtrack of the WebM is re-encoded as AAC at the default settings, so it is close to the original but not bit-identical.
- Only the sound is kept: the AAC file contains the audio track of your WebM, and the picture is dropped.
Settings you can change
Before you convert WebM to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted AAC file is kept for 2 hours, then deleted.
WebM to AAC: questions and answers
Does converting WebM to AAC reduce quality?
The soundtrack of the WebM is re-encoded as AAC at the default settings, so it is close to the original but not bit-identical.
What is the difference between WebM and AAC?
WebM is an open, royalty-free web video format with VP8, VP9 or AV1 video and Opus or Vorbis audio. AAC is the lossy audio codec that succeeded MP3.
Can I change the settings when converting WebM to AAC?
Before you convert WebM to AAC, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Do I need an account to convert WebM to AAC?
No. You can convert WebM to AAC without an account; signing in raises the file-size and daily limits.
How long is my converted AAC file kept?
The AAC file you convert from WebM is kept for 2 hours, then deleted automatically.
When I convert WebM to AAC, can I keep just the sound?
Only the sound is kept: the AAC file contains the audio track of your WebM, and the picture is dropped.
Will converting WebM to AAC change my original file?
No. The conversion reads your WebM and writes a new AAC file, leaving your original WebM file untouched.