MP3 to SRT converter, audio to SRT, and the subtitle-export side of transcription

The SRT / subtitle export cluster

A specific cluster of searches asks about subtitle file output: "mp3 to subtitle converter," "convert audio to srt file free," "convert mp3 to srt," "audio to srt converter online free," "mp3 to srt converter online," "mp3 to srt converter online free," "convert video to srt file," "convert srt file to mp3 online" (the reverse direction). The .srt and .vtt formats are subtitle files that pair text with timestamps and short segment durations — designed for video player overlay rather than reading.

For "mp3 to subtitle converter" the operation is two steps under the hood: transcribe the MP3, then export as .srt instead of .txt. Most modern transcription tools include .srt export. The result is a sidecar file the user can drop next to a video for caption display.

SRT vs VTT — minor differences

For most use cases, .srt is enough — every video player supports it, and the text-only nature avoids surprises. Use .vtt when targeting HTML5 video specifically or when caption styling matters.

Audio to SRT workflow

1. 01Upload the MP3 / audio file to a transcription tool.
2. 02Wait for transcription with timestamps.
3. 03Choose .srt or .vtt as the export format.
4. 04Download the .srt file.
5. 05For video use: place the .srt file in the same folder as the video, with the same base name and .srt extension. Most players auto-detect.
6. 06For burnt-in captions: open the .srt in a video editor and use it as a caption track.

For "convert audio to srt file free" — TigerScribe, Otter, Whisper (CLI), and Descript all offer .srt export on free tiers. For "convert mp3 to srt" specifically, the format is irrelevant; the tools accept MP3 and output .srt directly.

Convert video to SRT file

"Convert video to srt file" is the same workflow with video input. Modern tools accept MP4 / MOV directly, extract the audio internally, transcribe with timestamps, and export .srt. No separate audio-extraction step needed.

Convert SRT file to MP3 — the reverse

"Convert srt file to mp3 online" is the reverse direction — TTS reading subtitle text aloud. This is text-to-speech, opposite product category from us. For the use case where you want spoken audio of subtitles (rare, mostly accessibility-flavored), tools like NaturalReader, ElevenLabs, or browser TTS APIs work. The challenge is matching the original timing — TTS speaks at its own rate, which may not align with the original .srt timestamps.

Subtitle export — tool shortlist