How to convert MP3 to closed captions with Sonix

Sonix converts your audio-to-text using the latest artificial intelligence algorithms—it's fast, easy, beautiful, and affordable. We extract the speech from your MP3 file and help you create captions for your videos in minutes.

Convert MP3 to captions
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How to convert MP3 to closed captions with automated transcription 📋

Step 1: Create a free Sonix account to start converting your MP3 file to a closed caption file

Step 1

Sign up for a free Sonix trial account—includes 30 minutes of free MP3 to captions conversion.

Step 2: Upload your MP3 files from your computer, Google Drive, Dropbox, or by dragging it on the page.

Step 2

Upload the MP3 Audio File file(s) (*.MP3) from your computer, Dropbox, Google Drive, or by dragging it on the page.

Step 3: Select the language spoken in your MP3 file, then click 'Start Transcribing Now.'

Step 3

Choose the language spoken in the uploaded MP3 file. We support over 37 different languages including Russian, Chinese, Spanish, and English. Click the 'Start Transcribing Now' button.

Step 4: Sonix does all the work so grab a tasty cupcake. Our servers will extract the audio from your MP3 file and convert it to SRT.

Step 4

Sonix will then automatically transcribe the audio from your MP3 file and convert it to a simple text format. Grab a cupcake, it will take only a few minutes.

Step 5: Once your MP3 was converted to text, you might need to polish up the transcript. Now, you can easily do that with our AudioText Editor.

Step 5

Use the Sonix AudioText Editor to polish your transcript before we convert it to a caption file. Simply type in your browser to correct any words in your transcript.

Step 6: Download a SRT version of your MP3 file by clicking Export and selecting 'Subrip caption file (.srt).'

Step 6

Click the 'Export' button. Choose either 'Subrip subtitle file (.srt)' or 'WebVTT file (.vtt)' from the dropdown to download the closed caption version of your MP3 file. You can also adjust the character length and time duration length of each caption.

That's it! Your MP3 file has now been converted to closed captioning and is ready for the next step in your workflow!🎉

Thousands of incredible customers use SOnix to create closed captions from their MP3 files 💖

Google converts their MP3 audio files to closed captions with Sonix. You should too!Microsoft converts their MP3 audio files to closed captions with Sonix. You should too!NBC Universal converts their MP3 audio files to closed captions with Sonix. You should too!Harvard University converts their MP3 audio files to closed captions with Sonix. You should too!Stanford University converts their MP3 audio files to closed captions with Sonix. You should too!Yale University converts their MP3 audio files to closed captions with Sonix. You should too!ABC News converts their MP3 audio files to closed captions with Sonix. You should too!ESPN converts their MP3 audio files to closed captions with Sonix. You should too!Quartz converts their MP3 audio files to closed captions with Sonix. You should too!CNBC converts their MP3 audio files to closed captions with Sonix. You should too!CIBC converts their MP3 audio files to closed captions with Sonix. You should too!

Convert MP3 audio or speech to subtitle🔈

Frequently Asked Questions for MP3 Audio File (*.MP3)

What is a MP3 file?

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.

Does Sonix transcribe audio files with a *.MP3 file extension?

Yes, Sonix does automatically transcribe audio files with a .MP3 file extension. Sonix is an online audio to text converter. Convert any audio (mp3, m4a, wav, ...) or video (mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.MP3 files and converts them to text in a subtitle format.

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Create closed captions from your MP3 Audio File files with Sonix 🚀

Sonix transcribes your audio and video files in over 37 languages so they are easy to search, edit, and share. Sonix is an online, fully-automated speech to text service that quickly converts MP3 Audio File files to captions. Sign up today and start transcribing.

Fast, accurate automated transcription

Includes 30 minutes of free transcription

Transcribe and translate confidently knowing you’re backed by our award-winning team who is ready to answer your questions. You can also visit our Support Center for tips, articles, and videos.

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