OnlyMP3: how to turn a YouTube link into MP3 in three steps
The link to the video is already in the clipboard, but you only need the audio. YouTube delivers video together with a separate audio track, and you can't extract it with a single button. You need a converter that will save the audio as MP3.
OnlyMP3 does this right in the browser. You paste the video URL, get a ready file, and listen to it offline: on the road, at the gym, or on a plane. Below we'll look at what the service can do, how to get through the process in three steps, what quality to choose, and where the legal line is.
What OnlyMP3 can do and who it's for
💡 In short:
- Copy the YouTube video URL and paste it into the converter field.
- Start processing, choose the quality, and download the finished MP3 to your device.
- Quality and file size: 10/2026, according to filesize.org.
The OnlyMP3.to converter opens in the browser and requires no program or extension. According to the service (verified 10/2026), it handles regular videos, Shorts, and YouTube Music links up to 4 hours long. No registration is needed, and the service deletes temporary files automatically.
It works on phones, tablets, and computers: Windows, macOS, Android, iOS. The finished file downloads to your device or goes to Dropbox when that option is available. There's also a shortcut: insert "mz" right after "youtube" in the video URL and open the modified link.
The service suits those who collect lectures and podcasts for offline listening or store music locally. It's not for those who need video editing or subtitle work, because the output is audio only.
How to turn a video into MP3 in three steps
The process consists of three actions and requires no settings.
Step 1. Copy the video URL
Open the video on YouTube and click "Share", then "Copy link". On a phone, it's easier to take the address from the browser bar. Make sure the link points to a specific video, not a channel or playlist.
Step 2. Paste the link and start conversion
Open OnlyMP3.to and paste the address into the field. Start processing; you don't need to choose the format in advance. If the service offers quality options, choose the bitrate that fits your needs.
Step 3. Download the finished MP3
Wait for processing to finish and click the download button. The file will land in your downloads folder, from where it's easy to move it to a player or your phone.
For a short clip, processing is fast. The service also handles a multi-hour lecture, but you'll wait longer. Don't close the tab before it's done: if the connection drops, you'll have to repeat step 2.
Quality and file size: what to choose
The higher the bitrate, the better the sound and the larger the file. MP3 at 128 kbps takes about 1 MB per minute, and at 320 kbps roughly 2.4 MB (as of: 10/2026, filesize.org). Choose based on your needs.
Bitrate | Size per minute | What it's good for |
|---|---|---|
128 kbps | about 1 MB | speech, lectures, podcasts |
192 kbps | about 1.4 MB | music on the go |
320 kbps | about 2.4 MB | archive and maximum quality |
For speech, 128 kbps is enough: the voice stays clear and you save space. For music, use 192 or 320 kbps so you don't lose detail. YouTube stores audio in compressed form, so a bitrate above the source quality won't add new detail, it will only make the file bigger.
Copyright and YouTube rules
YouTube allows downloading only where there's a download button or the creator's explicit consent (verified 10/2026, YouTube rules). In other cases, downloading someone else's content is not allowed. Converting to MP3 doesn't change that: the audio remains a protected work.
Separately, there are laws about copying for personal use. In EU countries they work differently: in some places a private copy is allowed, in others it isn't. The exact answer depends on your country and on what exactly you're copying.
In practice, this means three things. Download only what you have the right to: your own recordings, openly licensed material, and other people's videos with the creator's permission. Don't re-upload finished MP3s and don't sell them. Responsibility for the file lies with you, and the service here is just a tool.
If conversion didn't work
Most often the problem isn't the program, but the link or the video itself. Check three common causes.
- The link isn't accepted. The address must point to a specific video, not a channel or playlist.
- Processing cuts off. Refresh the page and start conversion again; don't close long recordings before they finish.
- The video is unavailable. Private, deleted, and restricted videos won't be processed by the converter.
If the error repeats across different videos, check your browser settings. Sometimes it blocks downloads as pop-ups: allow file downloads for this site. And try another video to figure out where exactly the failure is.
⁉️🤔 Frequently asked questions
How much does conversion cost?
According to the service, the converter is free: you don't need to pay per video or for a package. If a site demands payment or asks you to install a suspicious program, you've landed on a page that isn't the official service.
What's the output format and quality?
The output is an MP3 audio file. Quality is set by the bitrate: for speech and podcasts a low value is enough, for music choose the maximum. The higher the bitrate, the larger the file, so for lectures you don't need a huge file.
Does the converter work on a phone?
Yes, the service opens in the browser on a smartphone and tablet. No separate app is needed. The process is the same: copy the video URL, paste it into the field, start processing, and download the finished file.
How long a video can be processed?
According to the service, it handles videos up to 4 hours long, so a full lecture or a complete podcast episode fits into an MP3. Larger files take longer to process, so don't close the tab before it's done.
Is this legal?
It depends on the video. For personal listening, the question is more about YouTube rules than the converter itself. Download only recordings you have the right to, and don't re-upload finished files.
In short: how to choose a converter
A good converter solves three problems: it extracts audio quickly, doesn't bury you in ads, and doesn't require registration. Evaluate it on these points and on the video length limit: weak services cut off on long recordings.
If you have one short clip, almost any fast converter will do. For large archives of lectures and music, check the time limits in advance. And before downloading, make sure you have the right to that file: you shouldn't save other people's recordings without permission.
A small editorial team writing guides for independent travel. We travel ourselves, but we haven’t been everywhere, so we check prices, opening hours and how to get there against official sources.