This tool converts FLV to AAC completely free and without any functional limitations. Since it is based on the browser API, the processing speed is the fastest because all files are processed locally on your device and are not uploaded to our server.
Batch Convert FLV to AAC Online
With this convertor, you can easily convert multiple FLV files to AAC format directly in your browser — completely free. You can also customize the video resolution (width and height) during the conversion.
To access advanced settings, click the Options button in the top right corner. There, you can set the output size for your AAC files.
Additional Settings:
Video Size: Set the width and height for the output AAC file.
Encoding Speed:Controls how fast the video is encoded. Faster speeds may result in larger file sizes.
Video Bitrate:Set between 1–10,000 Kbps to control the video quality and file size.
Frame Rate:Defines the video’s FPS (frames per second). Higher frame rates produce larger files.
Audio Bitrate:Recommended range is 16–320 Kbps.
Cut Video: Trim the video using a start and end time in HH:MM:SS format.
For example, setting 00:00:05 to 00:00:08 will cut a 3-second clip from the video or animation.
Before converting, you can choose a folder on your device where the converted AAC files will be saved. Each FLV file will be automatically saved to your selected folder after it's successfully converted — no manual downloads needed.
Save All: Once all FLV files are converted, click
Save All to instantly save all AAC files to your selected folder.
About FLV files
FLV (Flash Video) is a container format developed by Adobe for delivering video/audio over the internet using Adobe Flash Player. It was widely used for web streaming, online videos, and gaming platforms in the 2000s. Though largely obsolete after Flash's discontinuation, some legacy systems still use FLV files due to their small size and simple structure.
About AAC files
AAC (Advanced Audio Coding) is a highly efficient audio compression format developed by Fraunhofer IIS, AT&T, Dolby, and others. It delivers better sound quality than MP3 at similar bitrates, making it ideal for music streaming, podcasts, and mobile devices. AAC is the default audio format for Apple products (iTunes, iPods, iPhones) and is widely supported across platforms. Its lossy compression reduces file sizes significantly while maintaining excellent audio fidelity, though it's not as universally compatible as MP3.
