Convert PDF to MP3, free
Make an MP3 of any PDF with natural studio voices that run on your own computer. No upload, no account, no page limit.
Drop a PDF, Word, EPUB or text file
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Free, no limitsNo sign-upYour file never leaves your device
How to make the MP3
How long it takes
The speech is made on your device, so the time depends on your computer. A recent laptop or desktop with a good graphics chip makes audio faster than it plays; an older laptop can take one to three times the length of the audio. Bookvox shows progress and an estimate of the time left. Keep the tab open until it finishes; it keeps the screen awake where the browser allows.
What you get
- Speech-optimised MP3 (64 kbps mono), about 29 MB per hour of audio. It plays on every phone, car stereo and audio app.
- Files named by section number and title, so they sort in order.
- Short pauses between sentences and longer ones between paragraphs, so it sounds read rather than recited.
Tips for a better MP3
- Untick sections you don't need, such as references, index or appendices, in Contents before downloading the whole document.
- Listen to a few sentences first with the voice you've chosen, so you're happy with it before a long download.
- For a document you'll publish as an audiobook, read the platform rules first. Stores have their own audio specifications.
Questions
Is converting PDF to MP3 really free?
Yes, with no limits on length or the number of files. The audio is made by your own browser, so there's nothing for us to meter.
Why does it take a while?
Natural-sounding speech is made by an AI model running on your device rather than on a server. That keeps it free and private, but the speed depends on your computer.
Can I use the MP3 for my own projects?
The studio voice model (Kokoro-82M) is released under the Apache 2.0 license, and Bookvox adds no restrictions on audio you make. You do need the rights to the text you're converting.
Can I make the MP3 with an instant voice?
No. Browsers don't let websites record their built-in voices, so downloads always use a studio voice.
What if I close the tab?
The download stops, because the work happens in that tab. Start it again when you're ready.