Convert MP3 to SRT Subtitles

Upload an MP3 voiceover, podcast clip, or any audio file and get back a timed SRT file ready to drop into your video editor. SRT export is on the free plan.

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A lot of short-form video creators record their voiceover separately as an MP3 before they ever open an editor — a script read into a phone or a mic, exported as audio, then synced to footage later in Premiere, CapCut, or Descript. The problem is that MP3 file has no captions attached to it, and typing out timestamps by hand for every line is slow and easy to get wrong.

Transkio turns that MP3 into a subtitle file automatically. Upload the audio, let the transcription engine listen to it, and export the result as an SRT with cue numbers and timecodes already in place — no manual timing, no separate captioning tool, and it works across dozens of languages.

An MP3 Voiceover Doesn't Come with Captions Built In

If you record narration or a voiceover script as a standalone MP3 — separate from the video edit itself — you're left with audio and nothing else. Most video editors can burn in or overlay captions, but only if you feed them a subtitle file with real timecodes, not just a block of text.

Writing that timing by hand means scrubbing through the clip second by second, guessing where each line starts and ends, and redoing it every time you trim the audio. For a 60-second Reel that might be tolerable once; for a weekly upload schedule it isn't.

Upload the MP3, Download a Ready-to-Import SRT

Upload your MP3 (WAV, M4A, AAC, OGG, OPUS, and FLAC are accepted too, along with video files if you ever record straight to video). Transkio transcribes the audio and paces it into properly formatted subtitle cues — split at natural word boundaries so no line lingers too long or crams too much text on screen — then lets you export as an SRT with a single click.

Before exporting, the transcript is fully editable: click any line to jump the audio to that moment, fix a misheard word, or rename a speaker. What you download is the corrected version, not the raw first pass.

What You Get

SRT Export on the Free Plan

No paywall on the core feature. Free accounts get 60 trial minutes, then 30 minutes a month, exporting in TXT, SRT, VTT — no card required to start.

Cues Paced for Readability

Captions are split at natural word boundaries with sensible character and duration limits per cue, so lines don't blow past what a viewer can read in the time it's on screen.

Built for the Editor You Already Use

The exported .srt file imports directly into Premiere, CapCut, Descript, DaVinci Resolve, or any tool that reads standard SubRip subtitles — no reformatting needed.

Fix Mistakes Before You Export

Click any line in the transcript to jump the audio to that exact spot, correct a word, or rename a speaker — the SRT you download reflects your edits, not the raw transcription.

Handles More Than MP3

Accepts WAV, M4A, AAC, OGG, OPUS, and FLAC audio as well, plus common video formats, up to 100 MB per file on the free plan.

Speaker Labels When You Need Them

Recording an interview or multi-voice clip as MP3? Speaker detection separates who said what, available from the Elite plan up.

See it work

See the Difference

A real example of how the same recording reads before and after Transkio.

Short-form voiceover clip, transcribed and timed

Before — raw auto-captions

so today im gonna show you three things that changed my morning routine and honestly the third one surprised me the most so stick around

After — Transkio transcript

1 00:00:00,000 --> 00:00:03,200 So today I'm going to show you three things 2 00:00:03,200 --> 00:00:06,400 that changed my morning routine, and honestly 3 00:00:06,400 --> 00:00:09,000 the third one surprised me the most. Stick around!

Frequently asked questions

What's the difference between a transcript and an SRT file?

A plain transcript is just the spoken words as continuous text — useful for reading or reuse, but a video editor can't place it on screen. An SRT file breaks that same content into numbered cues, each with a start and end timecode, which is the format video editors expect for captions.

Is SRT export really available on the free plan?

Yes. SRT is one of the export formats on every plan, including free, alongside TXT and VTT. Free accounts get 60 trial minutes and then 30 minutes a month, with no card required to sign up.

Do I have to upload an MP3, or can other audio formats work?

MP3 is fully supported, along with WAV, M4A, AAC, OGG, OPUS, and FLAC audio, plus MP4, MOV, WebM, MKV, and MPEG video if you ever record straight to video instead of audio-only.

Can I edit the captions before I export the SRT?

Yes. The transcript is editable before you export — click a line to jump the audio to that point, correct any misheard words, or rename speakers. The SRT you download reflects those edits.

Which video editors can open the SRT file?

Any editor that supports standard SubRip subtitles, which covers Premiere Pro, CapCut, Descript, DaVinci Resolve, Final Cut Pro, and most others — you import the .srt file directly alongside your footage.

Turn Your MP3 Voiceover Into Captions

Upload the audio and export a properly timed SRT file in minutes — free plan included, no card required.

Transcribe for free

30 free minutes, no card required
Transcripts in minutes, not hours
50+ languages