Real privacy
Audio is processed inside your browser. We do not receive or store your media files.
Free · No signup · Private
Convert MKV to OPUS directly in your browser
Select one or more MKV files and convert them to OPUS on your device, without uploading the files to our servers.
Converting to OPUS can reduce file size or improve compatibility, but it cannot restore quality already lost in the source.
Multiple files
Local conversion
Phone and PC
Processing happens locally on this device
Available tools
One engine for more audio conversions
They all work without signup and process files locally.
MP3 to OPUSFree and privateOpenWAV to OPUSFree and privateOpenM4A to OPUSFree and privateOpenAAC to OPUSFree and privateOpenFLAC to OPUSFree and privateOpenOGG to OPUSFree and privateOpenOPUS to MP3Free and privateOpenAIFF to OPUSFree and privateOpenWMA to OPUSFree and privateOpenMP4 to OPUSFree and privateOpenWEBM to OPUSFree and privateOpenMOV to OPUSFree and privateOpenAMR to OPUSFree and privateOpenMKV to OPUSFree and privateIn useAVI to OPUSFree and privateOpen3GP to OPUSFree and privateOpenMPEG/MPG to OPUSFree and privateOpen
Batch conversion
Add multiple MKV files and let the queue process them automatically, one by one.
No installation
Use it from a phone or computer browser without creating an account.
Frequently asked questions
Simple on the outside. Private on the inside.
Are my audio files uploaded to the internet?
No. Your file is read, converted and downloaded from your own browser. The media file itself is not uploaded to our servers.
Does converting to OPUS improve audio quality?
No. Converting can improve compatibility or reduce file size, but it cannot restore audio information already lost in the source file.
Why can the first conversion take a little longer?
Your browser has to prepare the audio engine once. After that, the queue can continue automatically.