Audio converter
Convert Audio to ASS Online
Upload an audio or video file and get ASS subtitles in seconds — the spoken language is detected automatically among 93 supported languages, and one upload also produces every other subtitle format.
Transcribe a file free2 free files without an account · 3 every month once you register · nothing is stored on our servers
1 upload = every format
One transcription returns TXT, SRT, VTT, ASS, SSA, MicroDVD, MPL2 and TMP — download one or grab the ZIP.
93 languages, auto-detected
The spoken language is recognized automatically among 93 languages, and the finished transcript translates into any of 110 languages for free.
Private by design
Audio streams through without being stored; server copies of the text are erased within 1 hour. Your history lives in your browser.
Editable result
Fix or delete any line in the built-in player — every subtitle format and download updates instantly.
Subtitle lines, not blocks
The engine returns 30-second blocks. We re-cut them on the pauses in the speech, within the length and reading-speed limits subtitles are held to.
The video stays with you
MP4, MOV, MKV, WebM, AVI up to 1 GB — the audio track is extracted in your browser, so only sound is ever uploaded.
About the ASS format
Advanced SubStation Alpha (.ass) carries full styling — fonts, colors, outlines, positioning and karaoke timing. It is the standard for anime fansubs and any project where subtitles must look designed, and it is edited natively in Aegisub.
Opens in: Aegisub, VLC, mpv, MPC-HC, any libass-based player.
Frequently asked questions
How do I convert audio to ASS?
Upload your file (MP3, M4A, WAV, OGG, WMA up to 75 MB — or a video up to 1 GB), let the language auto-detect, press Start Transcription and download the .ass file. The whole flow takes under a minute for typical files.
Which other formats do I get from the same upload?
All of them: plain text, SRT, VTT, ASS, SSA, MicroDVD, MPL2 and TMP come from a single transcription — individually or as one ZIP archive.
How much does it cost?
Your first 2 files are free with no account, and a free account gives you 3 every month. After that, plans start at $2/month for 20 transcriptions — every subtitle format and free translation are included in each one.
Are my files stored anywhere?
No. Audio streams straight through to the recognition engine and is never written to disk; transcript texts are erased from our servers within 1 hour. Your lasting copy stays in your own browser.