Convert MP3 to SRT

Generate perfectly-timed SRT subtitle files from your MP3 audio. Sonix transcribes your MP3 with precise timestamps, then exports to SRT format ready for YouTube, Vimeo, or any video platform.

Timestamped
5-min turnaround
All platforms
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
About This Format

Understanding MP3 files

What is a MP3 file?

Universal audio format supported everywhere

MP3 files are one of the most common audio file formats. Almost every player on any platform can open an mp3 file. The MP3 file format is a compressed file format with an intentional loss of audio quality. However, the loss should be negligible for the typical user. It was developed by the Moving Picture Experts Group (MPEG) and uses ‘Layer 3’ audio compression.
The audio compression preserves the audio within a normal human’s hearing range, while discarding unnecessary information outside of that range. MP3 files are usually used to store music and audiobooks with ‘near-CD quality sound’ (aka Stereo at 16-bit), but due to the great compression algorithm, the file size is around 1/10th of the WAV or AIF file equivalent. The quality of an MP3 file depends largely on the compression bit rate. Common bit rates are 128, 160, 192, and 256 kbps. And higher bit rates result in higher quality files that also require more disk space. MP3 files are easily handled and transcribed by Sonix, please try to upload higher bitrate quality audio files which will improve your transcript’s accuracy.

Common Uses

  • Music distribution
  • Podcast episodes
  • Audiobooks
  • Voice recordings
  • Music streaming

Audio Quality

Lossy compression; 192kbps+ indistinguishable from CD quality

Transcription Tips for MP3

  • 128kbps or higher recommended for accurate transcription
  • Very common format - Sonix handles all MP3 files
  • Variable bitrate (VBR) MP3s work fine
  • Avoid very low bitrates (below 96kbps) for speech

Where MP3 Files Come From

  • Spotify downloads
  • Podcast apps
  • Music players
  • Voice recorders
  • Web downloads
10x
Faster than real-time
Get your MP3 SRT in minutes
99%
Accuracy rate
Industry-leading AI for MP3 files
53+
Languages
Subtitles in any language
30+
Export formats
SRT, VTT, text, and more
How It Works

Convert MP3 to SRT in 6 steps

Step 1

Create account

Sign up for Sonix's free trial. Includes 30 minutes free.

Step 2

Upload file

Upload your MP3 file from your computer or cloud storage.

Step 3

Select language

Choose from 53+ languages spoken in your file.

Step 4

Auto-transcribe

Sonix AI transcribes and timestamps your MP3 audio.

Step 5

Edit subtitles

Fine-tune subtitle timing and text with our editor.

Step 6

Export SRT

Download your MP3 subtitles as an SRT file.

Common Questions

Everything about MP3 to SRT

Can I create SRT subtitles from an MP3 file?

Yes! Upload your MP3, Sonix transcribes it with word-level timestamps, then export as SRT. This is perfect for adding subtitles to video content where you only have the audio track, or for creating podcast videos with accurate captions.

How accurate are MP3-to-SRT subtitle timings?

Sonix generates word-level timestamps during transcription, resulting in precisely timed subtitles. The timing accuracy typically matches within a few hundred milliseconds. You can fine-tune any timing in our editor before exporting the final SRT file.

What's the character limit for SRT subtitles from MP3?

Sonix automatically formats SRT exports to follow best practices - typically 42 characters per line with a maximum of 2 lines per subtitle. This ensures readability on any video player. You can customize these settings in the export options.

Can I upload my MP3 SRT subtitles to YouTube?

Absolutely! The SRT files exported from Sonix are fully compatible with YouTube, Vimeo, Facebook, LinkedIn, and all major video platforms. Simply upload the .srt file to your video's caption settings and the subtitles sync automatically.

How do I edit subtitle timing for my MP3 content?

Sonix's visual editor lets you adjust timing by dragging subtitle boundaries or entering specific timestamps. Play the audio while editing to ensure perfect sync. All changes are reflected in your SRT export.

Can I add speaker names to SRT subtitles from my MP3?

Yes! When exporting to SRT, you can choose to include speaker labels at the beginning of each subtitle segment. This is helpful for interviews, podcasts, and multi-speaker content where viewers need to know who is speaking.

Why Sonix

Perfect SRT subtitles from MP3 files

Precise Timestamps

Word-level timing ensures your subtitles sync perfectly with the audio.

Universal Format

SRT works with YouTube, Vimeo, Facebook, and all major video platforms.

Customizable

Adjust timing, line length, and caption duration to your needs.

Editor Friendly

Import directly into Final Cut Pro, Premiere, DaVinci Resolve, and more.

Reviews

Trusted by video creators

4.98 rating from 211 reviews

I absolutely love what you guys have done with this. Sonix is literally a magical product that has helped me so much already and I will be using this for a long time coming.
AM
Alan M.
Burnaby, BC, Canada
Sonix has revolutionized my life! I’m so thankful for the service you provide. It’s been amazing.
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Evelyn G.
Houston, TX
I’ve been using your transcription software for about a year now. I just wanted to let you guys know that I think it is incredible. I have tried many alternatives, and none of them have bee...
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Ahmad D.
New York, NY USA
The transcription service was awesome. I can’t thank Sonix enough.
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Glenda I.
San Diego, CA USA
The highest accuracy I have ever achieved through similar services.
JB
John B.
Townsville, Australia
The UI experience is fantastic! It's quick and easy to understand. Plus it's web based so I can switch between my desktop and laptop easily.
AL
Andras L.
Budapest, Hungary
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