September 25, 2026 · 6 min read
How to convert audio to text for free (mp3, m4a, voice notes and videos)
You have a recording — a lecture, a meeting, an interview or a long voice note — and you need the text. There are several ways to get it without spending money. Here's what each one gives you, and which saves the most time depending on what you'll do with the text afterwards.
1. The phone dictation trick (short audio only)
Android and iPhone keyboards have voice dictation. If you play the audio near the microphone with dictation on, your phone will type what it hears. It's free and fine for a couple of minutes, but it stops often, struggles with background noise and can't tell who is speaking.
Use it for a short voice note. For an hour-long lecture it's a waste of time: you'd be stuck next to your phone the whole time and end up with one long block of unpunctuated text.
2. Online transcription tools
Some websites transcribe files for free with limits on minutes or file size. Before uploading anything, check three things: how many free minutes you really get, whether they keep your audio and what for (some use it to train their models), and whether you only get plain text or something that helps you use it.
A raw transcript is the first step, but it's rarely what you actually need: you want to study the lecture, write the minutes or find a specific quote. Reading an hour of transcript is almost as slow as listening again.
3. AI transcription that also organizes it
The more complete AI tools don't stop at text: they split it into chapters by topic, pull out the key points and, depending on the case, prepare study notes, a practice test or meeting minutes with everyone's action items.
That's how SwiftBOL works: upload the file (mp3, m4a, wav, mp4, mov, ogg/opus or webm) or record straight from your browser, pick Student or Work mode, and a few minutes later you have the full timestamped transcript, a summary by chapter and a chat to ask your audio questions. The Free plan includes 2 hours of audio a month, no card needed, and your audio is never used to train any AI.
Tips for a better transcript
Record as close to the speaker as you can: in a lecture, sit near the front. If you record on your phone, leave it on the desk, not in your bag or under papers.
If the file is very large, export it as a 64 kbps mp3: speech stays perfectly clear and the file gets much smaller. And if the audio includes technical terms or names, add them to your account's glossary so the AI spells them right.
Which one should you choose?
For a one-minute voice note, phone dictation. For anything over 10 minutes that you'll need to study, summarize or share, an AI tool that organizes the content saves you hours. You can try SwiftBOL free with your next class or meeting and compare the result.
Try it with your own audio
SwiftBOL transcribes, summarizes, and structures your meetings and classes in minutes. The Free plan includes 2 hours of audio a month, no credit card required.