Drop file here. 150 MB maximum file size.
An MKV file is a recorded video file in the Matroska multimedia container. It supports several types of video and audio codecs and can include .SRT, .SSA, .USF (Universal Subtitle Format) or VobSub. Typically, MKV files are used to store short video clips, TV shows and movies.
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 MKV tools to convert, view, edit, merge, split, and compare MKV files β all without installing any software. Our tools support the .MKV (Matroska Video File) file extension and run smoothly in any modern browser.
Select a tool below to explore features and manage your MKV files directly from your device with ease.
Chose or drag & drop your MKV 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 MKV 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 MKV to 100s of file formats, without any limit, registration and downloading, 100% free and online MKV 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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These are the most polular file/document converters based on the user's review and usage on the FileProInfo.