Add audio to PowerPoint, slide by slide
Drop your .pptx and your MP3s. Each slide gets its own track, plays on open and moves on when the audio ends. Free.
Three steps, done
Upload the deck
Drop a .pptx. Every slide is listed with its title so you can see where each track lands.
Drop audio on slides
Add MP3, WAV, M4A or OGG files. They fill the slides in order, and each slide has a picker to swap the file or leave it silent.
Download the .pptx that plays itself
Autoplay and auto-advance are on by default. Press Slide Show and the deck runs on its own, slide after slide.
Your deck, with a voice
Narrated PowerPoint
Every slide voiced by an AI voice, timed to auto-advance. Download the .pptx and press play.
Narrate every slide of my PowerPoint with a natural voice and give me the narrated .pptxMP3 narration
The whole deck as one clean audio file, or one clip per slide.
Read my PowerPoint aloud and give me the MP3Deck from a brief
Describe the talk. Noty writes the slides, designs them and narrates them.
Make me a narrated presentation aboutYour own voice
Clone your voice once and every deck sounds like you presenting.
Narrate my deck in my cloned voiceVideo export
SoonThe narrated deck rendered as an MP4 for YouTube, LMS or email.
Tell Noty you want videoFrom loose files to a deck that runs itself
Before
Silent slides + audio files
A .pptx in one place, a folder of MP3s in another, and a presenter clicking play on every slide.
After
A PowerPoint that presents itself: per-slide audio, autoplay, auto-advance
Each track embedded in its slide, starting when the slide opens and moving on when it ends. One file to send.
No recording? Noty narrates it
Adding audio assumes you already have it. If you don’t, tell Noty in the Studio chat: it writes the narration from your slides and speaker notes, voices every slide and hands back a PowerPoint that plays itself.
How PowerPoint plays embedded audio
Audio added here is embedded the way PowerPoint embeds it itself: the file lives inside the .pptx, attached to a slide, with playback settings you can still change in PowerPoint’s Playback tab.
Autoplay vs click to play
With autoplay on, a slide’s track starts the moment the slide opens. With it off, the speaker icon stays on the slide and the audio plays when you click it.
Playing across slides
Pick “One track across the deck” and a single file goes on slide 1, starts on open and keeps playing as you move through the slides until the track ends. Good for background music or one long voiceover.
Auto-advance timing
Each slide gets a timer the length of its audio plus one second, so the last word never gets cut. A click still moves on early. Untick “Use Timings” in the Slide Show tab to present by clicking instead.
Where the icon sits
A small speaker icon goes in the bottom-right corner of the slide. Tick “Hide the speaker icon” and it’s placed off the slide, so it shows neither while editing nor during the show.
Keynote and Google Slides
Google Slides ignores audio embedded in a .pptx when it imports the file, so the slides arrive silent. Keynote imports the audio; check its playback settings before presenting.
The file gets bigger
Audio is stored inside the .pptx, so the deck grows by roughly the size of your audio files. MP3 and M4A keep it small; WAV is uncompressed and several times larger.
Adding audio, three ways
Most online tools put one file on slide 1 and let it run. PowerPoint does it right, but one slide at a time through the Insert menu.
| Notevibes | Online add-audio tools | PowerPoint | |
|---|---|---|---|
| Per-slide audio | One track on slide 1 | Manual, per slide | |
| Auto-advance on audio end | Manual timings | ||
| MP3, WAV, M4A, OGG | MP3, WAV, M4A | ||
| AI narration written from your slides | |||
| Your own cloned voice | |||
| Video export | Soon | Export only |
Use the free tool above when the recordings exist. When they don’t, Noty writes and voices the narration for every slide and hands back the finished deck.
Recording your own audio vs generating it
For one deck, recording yourself is fine. A decent microphone, a quiet room and a take per slide get you there, and this tool puts each take on the right slide.
The cost shows up later. Change one slide and you re-record it, and the new take has to match the old ones in tone and level. A second language means recording the whole deck again. Ten decks a quarter means ten recording sessions.
Generated narration moves that work to text. Noty writes a script for each slide from its text and speaker notes, you edit the words, and the voice is regenerated in seconds. The same deck can be narrated in another language, in a different voice, or in your own cloned voice, without a microphone.
A reasonable split: record when your own voice and delivery are the point, such as a keynote or a personal pitch. Generate when the deck will change, be translated, or be one of many.
Making the deck advance on its own
A self-running deck needs two things per slide: the audio starts by itself, and the slide knows when to move on. The first is autoplay. The second is a slide timing, the “After” value in PowerPoint’s Transitions tab.
This tool sets that timing from each file’s length plus a one-second beat, so a slide moves on right after its audio finishes. Slides without audio keep their own settings and wait for a click unless you give them a timing in PowerPoint.
Want a longer pause on a particular slide, say to let a chart sink in? Raise that slide’s “After” value in the Transitions tab. Record a little silence at the end of a take and the pause is already built in.
To check the flow, press Slide Show from the start and let it run without touching anything. If a slide cuts off early, its timing is shorter than the audio; if it hangs, the timing is longer or “Use Timings” is off.
Skip the recording
Noty writes the narration from your slides, voices every one of them in a natural voice or yours, and hands back a PowerPoint that plays itself.
Free to try · No credit card required
More PowerPoint tools
Frequently Asked Questions
What audio formats are supported?
MP3, WAV, M4A and OGG. For decks you’ll present in PowerPoint, MP3 or M4A are the safest choice: they keep the file small, and PowerPoint doesn’t list OGG among its supported audio formats.
Will the audio play automatically?
Yes, with Autoplay on (the default) each slide’s track starts when the slide opens in Slide Show. Turn it off and the speaker icon stays on the slide, and the audio plays when you click it.
Can one track play across all slides?
Yes. Choose “One track across the deck”: the file goes on slide 1, starts automatically and keeps playing as you move through the slides until the track ends.
Is there a file size limit?
There is no set limit. Everything is processed in your browser’s memory, and the audio ends up inside the .pptx, so large WAV files make a large deck.
Can I edit the deck after adding audio?
Yes, it’s an ordinary .pptx. In PowerPoint, select the speaker icon and use the Playback tab to trim, fade or change the volume, or the Transitions tab to change slide timings. One thing to know: autoplay replaces the animations on the slides that get audio, so re-add those in PowerPoint if you need them.
What happens to audio already on a slide?
It’s replaced. A slide that gets a new file loses its current track, speaker icon, audio timing and transition sound first, so it never plays two tracks at once, and the old file is dropped from the .pptx. Slides you leave on “None” keep their audio exactly as it was. Each slide that already has audio is marked in the list.
Does it work in Google Slides or Keynote?
Google Slides drops audio embedded in a .pptx on import, so add audio there with Insert → Audio from Google Drive. Keynote imports the audio; check the playback settings in Keynote before presenting.
Is the audio icon visible during the slideshow?
By default a small speaker icon sits in the bottom-right corner of the slide. Tick “Hide the speaker icon” and it’s placed off the slide, so it doesn’t show while editing or presenting. Hiding needs autoplay, since the icon is how you’d start the audio otherwise.
Can Notevibes create the narration instead?
Yes. Tell Noty in the Notevibes Studio and it writes narration for every slide from the slide text or speaker notes, voices it in a natural AI voice or your own cloned voice, and hands back a narrated .pptx that auto-advances, plus the MP3.