MP3 → ASS
Convert MP3 to ASS Online
Upload an MP3 file and download ready ASS subtitles in seconds, with the spoken language detected automatically.
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 MP3 to ASS?
Upload the MP3 file, press Start Transcription and download the .ass file. Timestamps are generated automatically; you can edit any line before downloading.
Do I also get other subtitle formats?
Yes — one upload returns TXT, SRT, VTT, ASS, SSA, MicroDVD, MPL2 and TMP together, downloadable individually or as a ZIP.
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.