What is SPX, and how do you transcribe it?
SPX (Speex (in Ogg)) is an audio format you'll typically find from old VoIP recordings and podcasts circa 2005-2012. A speech-specific codec later replaced by Opus; low bitrates sound thin but remain transcribable.
To turn it into text you don't need to convert anything first — upload the SPX file (or paste a link) and Whipscribe returns a clean transcript with speaker labels and per-word timestamps, exportable to TXT, SRT, VTT, or DOCX. Everything runs on private infrastructure that never hands your file to a third-party AI service.
How to transcribe SPX in 3 steps
Add your SPX
Upload the SPX file or paste a link. 30 minutes free daily, no signup to try.
We process it
We read the audio and Whisper transcribes the speech privately.
Read & export
Speaker-labeled, timestamped text in minutes. Export TXT, SRT, VTT, or DOCX.
Frequently asked
How do I transcribe a SPX file?
Upload the SPX file or paste a link. Whipscribe reads the audio directly. You get timestamped, speaker-labeled text in minutes.
Do I need to convert it first?
No — Whipscribe reads SPX directly, so there's no need to convert to MP3 or WAV.
How much does it cost?
About 3.3¢ per audio minute (~$2 an hour), 30 minutes free every day, no signup to try.
Is my file private?
Yes — private infrastructure, never sent to a third-party transcription service, no training on uploads. Delete anytime.