Convert WEBM to AAC online
Free, no sign-up, no limits. Drop your WEBM files, get AAC files back in seconds.
1 files converted so far
Drop your WEBM files here
or · multiple files accepted
Local conversion: your files never leave your device.
Why convert WEBM to AAC?
An online recorder, a screen capture or a YouTube download gave you a WebM file that your usual player rejects. AAC is recognized everywhere.
How to do it, step by step
- Drop your WEBM fileinto the area at the top of the page (or several files at once). On mobile, tap the area and pick the file from your apps.
- Check the output format: AAC is already selected. For music, 192 kbps is transparent for most listeners and 320 kbps gives the maximum. For voice (memos, podcasts, lectures), 128 kbps is more than enough and halves the file size.
- Start the conversion.The FFmpeg engine loads once (≈ 10 MB), then each file is processed in a few seconds without leaving your device.
- Download your AAC, directly or as a .zip if you converted several files. The name and metadata (title, artist, cover art) are preserved.
The WEBM format (WebM (audio))
WebM is an open web container, used by YouTube, screen recorders and the voice recorders built into browsers. Its audio is Opus or Vorbis. Many desktop applications and devices cannot play it.
- Open web format
- Produced by online recorders
- Rarely played outside a browser
- Zero compatibility with car stereos
The AAC format (Advanced Audio Coding)
AAC is the successor to MP3: at the same bitrate, the sound is better. It is the audio codec of YouTube, Apple Music, digital TV and most MP4 videos. A raw .aac file (without the M4A container) is rarer and less well supported than its .m4a equivalent.
- Better quality than MP3 at the same bitrate
- Standard for video and streaming
- Raw .aac file poorly compatible
- No metadata without a container
WEBM vs AAC comparison
| WEBM | AAC | |
|---|---|---|
| Compression | Lossy | Lossy |
| Typical size (1 min, music) | ≈ 0.8 MB | ≈ 1.2 MB (160k) |
| Common use | browser recordings, screen captures, downloaded YouTube videos | streams extracted from videos, digital recorders, streaming |
| Metadata (title, cover art) | Limited | Limited |
Frequently asked questions
Does converting WEBM to AAC lose quality?
AAC is a lossy compressed format: a conversion always involves re-encoding. At 192 kbps or higher, the difference is inaudible in the vast majority of cases. Just avoid chaining several successive conversions.
Is the WEBM to AAC converter free?
Yes, with no limit on the number of files, no sign-up and no watermark. Each file can be up to 200 MB.
Are my WEBM files uploaded to the internet?
No. The WEBM to AAC conversion is performed by FFmpeg directly in your browser (WebAssembly). Your files never leave your computer or phone.
How do I convert WEBM to AAC on iPhone or Android?
Open this page in Safari or Chrome, tap the drop area, select your WEBM file (from Files, Voice Memos, Downloads or WhatsApp), then tap "Convert". The AAC downloads to your files.
Can I convert several WEBM files at once?
Yes, add all your files in one go. They are converted one after another and a button lets you download everything as a .zip archive.