Drop file here. 150 MB maximum file size.
An ASF is a multimedia file stored in the Advanced Systems Format (ASF), a video and audio container. Only audio data, or video and audio data, as well as optional metadata, such as title, author and bibliographic data of the author's right. The ASF files are developed by Microsoft mainly for streaming online media.
An SPH file is an audio file created in the NIST SPHERE format, which is often used in searching speech recognition. Usually contains the apos; recording of apos; a person who speaks. The SPH files can be provided as voice-recognition system entries.
Access powerful and secure free online ASF tools to convert, view, edit, merge, split, and compare ASF files β all without installing any software. Our tools support the .ASF (Advanced Systems Format File) file extension and run smoothly in any modern browser.
Select a tool below to explore features and manage your ASF files directly from your device with ease.
Chose or drag & drop your ASF file, click Convert to SPH, and download the SPH file. No registration needed.
Yes, all uploads are encrypted. Your files are auto-deleted after 24 hours.
Yes, our converter retains layout, fonts, and images as accurately as possible.
Fileproinfo converter engine works fast. You can convert ASF to SPH in a few seconds to couple of minutes for large size files with complex structure.
FileProInfo support manay file formats that allow you to convert ASF to 100s of file formats, without any limit, registration and downloading, 100% free and online ASF converter.
All converters in this list are manually verified & 100% free and working properly, however you must use these apps according to their respective terms & conditions.
This tool and page updated at: 12-Apr-2025
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