How to Add AI Voiceovers to CapCut on iPhone (Step-by-Step)

You have the clips. You have the idea. But you need a voiceover that sounds right for your TikTok, Instagram Reel, or YouTube Short—and you want to do it all on your iPhone.

One approach is to use CapCut’s own text-to-speech tools. Another is to create the narration separately, then bring a finished audio file into CapCut. The second workflow is useful when you want to preview a voice, revise the script, keep a reusable audio file, or generate the speech offline.

In this guide, you’ll generate narration using Spokio for iPhone, save the result as M4A or WAV, and add it to a video in CapCut. No Mac or cloud text-to-speech API is required for the speech-generation step.

Quick answer: AI voiceover in CapCut on iPhone

1. Write a short script for your video.
2. Open Spokio on iPhone, choose a voice, and tap Generate Audio.
3. Listen to the result; use Edit and regenerate if the pacing needs work.
4. Tap Export → Save M4A (or Save WAV) and save the file to a folder in the iOS Files app.
5. Open your project in CapCut, find its option to add audio from your device, and select the exported file.
6. Position the narration on the timeline, adjust levels, preview, and export your finished video.

Important: Spokio generates the voiceover; CapCut is the video editor. This is a file-based workflow, not an automatic integration between the two apps. CapCut’s import labels and available features may differ by app version and region.

What you need

• An iPhone running iOS 26 or later.
• Spokio, for making local English-language narration.
• CapCut, for editing the video.
• A short script and video clips or photos you have the right to use.
• Access to the iPhone Files app, where you’ll store the exported audio.

Spokio’s iPhone version supports MP3, WAV, M4A, and AIFF for individual audio exports. This tutorial uses M4A because it’s compact and convenient for a phone-based workflow. WAV is a good alternative if your editor has trouble opening the M4A file or you prefer an uncompressed source.

Spokio’s synthesis runs on your device; you don’t need to upload the text to an online voice-generation service. Downloading or updating apps and publishing your video may, of course, require internet access.

Step 1: Write the voiceover for the video you want to make

Start with the video, not the voice model. A good short-form script tells the viewer what’s happening and leaves space for the visuals.

A simple structure is:

Aim for a script that sounds natural when spoken, not one that reads like a caption or blog paragraph. Use short sentences, recognizable words, and deliberate pauses.

For a first test, try a 20–30-second video. At a rough speaking pace of 130–160 words per minute, 50–70 words gives you about 20–32 seconds of speech. This is only an estimate: punctuation, voice, and speed will change the actual duration.

Tip: Don’t describe every visual detail in the narration. Let the video carry some of the explanation while the voice keeps the story moving.

Step 2: Generate the AI voiceover in Spokio

1. Open Spokio on your iPhone and start a new audio draft.
2. Paste or type your voiceover script.
3. Choose one of the available English voices.
4. Adjust speed if the delivery feels too slow or rushed.
5. Tap Generate Audio.
6. Play the finished take and listen with your video length in mind.

You can also use a custom voice based on a recording you own or are authorized to use. Avoid cloning someone else’s voice without their permission.

Spokio is especially useful for testing variations of a hook before you edit the final video. Generate a version, listen, then use Edit to change the wording and generate again. The goal isn’t to make every syllable perfect on the first pass; it’s to get a clean take you can confidently time to your footage.

For more on Spokio’s iPhone workflow, see How to Use Spokio: Your First Voiceover.

Step 3: Save the narration to Files

Once you like the generated take:

1. On Spokio’s completed-audio screen, tap Export.
2. Under Save to Files, choose Save M4A.
3. In the iOS file picker, pick a folder you can find again. For example, create a folder named Video Voiceovers under On My iPhone.
4. Save the file and confirm it appears in the Files app.

If you want an uncompressed source, choose Save WAV instead. Both formats are supported by Spokio’s export screen.

Why use Files instead of just Share? Saving explicitly to Files gives you a predictable location to browse from CapCut. Spokio also has share-sheet options, but whether CapCut appears as a direct share destination can change with app versions and iOS settings. The Files workflow is more reliable as a repeatable tutorial.

Give each revision a distinct name if you’re keeping multiple takes:

video-hook-v1.m4a
video-hook-v2.m4a
video-main-narration.m4a

The exact exported filename may initially follow the audio item’s name; you can rename it in Files if needed.

Step 4: Import the AI voiceover into CapCut on iPhone

Now move from the voice-generation app to the video editor.

1. Open CapCut and create a New project, or open the project you’re already editing.
2. Add your video clips and arrange the main sequence.
3. In the editing toolbar, choose Audio.
4. Open the part of the sound browser for your own audio. Depending on the version, it may be labeled Sounds, Your sounds, From device, or Import.
5. Browse for the audio file you saved in Files, select it, and add it to the timeline.
6. Play the timeline to make sure the narration was imported correctly.

CapCut supports adding personal audio to projects, but its mobile menus move over time. For the latest interface, consult CapCut’s audio help. If your version’s audio browser doesn’t offer an obvious Files picker, check Your sounds / From device and the app’s import controls rather than assuming Spokio failed to export.

If CapCut cannot find the file: Open Files and confirm that you saved a real .m4a or .wav file, not just an audio item inside Spokio. Try moving it to On My iPhone, reopen CapCut’s device-audio browser, or export a WAV version from Spokio as a compatibility fallback.

Step 5: Sync the voiceover with your clips

Importing the audio is only half the job. The timing is what makes a voiceover-led short video feel finished.

Try this order:

1. Place the hook so the first spoken phrase starts when the opening visual appears.
2. Split or trim video clips at changes in the narration, rather than forcing the voice to follow arbitrary visual cuts.
3. Lower background music under the speaking sections so the words stay intelligible.
4. Trim silence or move clips to avoid a long empty tail after the final sentence.
5. Preview from beginning to end using the iPhone speaker or headphones before exporting.

CapCut provides timeline tools for positioning and trimming audio and adjusting volume and fades. The precise labels may differ by release; its official guide to combining video and audio covers the general editing principles.

A useful technique is to finish your narration first, then align the visuals to it. If your voiceover is 27 seconds long, build the video around those 27 seconds instead of squeezing your words into an already locked 20-second edit.

Step 6: Add captions without redoing the voice

Short-form videos often benefit from on-screen captions, especially when viewers watch with their sound muted. Captions should match what the voice actually says, including any edits you made in Spokio.

After the final narration is placed on your CapCut timeline, use the caption or subtitle tools available in your version of the app. Review the resulting text carefully: product names, proper nouns, and numbers can be transcribed incorrectly.

Use captions to support the narration—not to cover the screen with every word in oversized text. Make sure your most important on-screen buttons, faces, and product details remain visible.

Keep the two workflows separate: Spokio produces the spoken audio; CapCut handles video editing and captions. This article does not assume Spokio generates or burns subtitles into the video.

Step 7: Export for TikTok, Reels, or Shorts

Before exporting, check three things:

• Audio balance: Can you understand every line over the background music?
• Pacing: Do the opening words arrive immediately enough for the video’s format?
• End of video: Does the last voiceover sentence finish naturally, without getting cut off?

Then use CapCut’s Export option and choose settings suitable for where you’re publishing. A vertical 9:16 canvas is a practical starting point for TikTok, Instagram Reels, and YouTube Shorts; always check the current platform requirements if you need a specific resolution, frame rate, or duration.

Keep your exported Spokio narration file. You can reuse the same take when you remake the video for another platform, change the visual edit, or create a version with different captions.

Should you use CapCut’s built-in TTS or Spokio?

It depends on the job.

If your current CapCut voice works and you’re happy editing everything in one place, there’s no reason to complicate the workflow. The two-app setup becomes useful when you care about offline generation, reusable audio files, or keeping script revisions separate from your video timeline.

Troubleshooting

My exported narration does not appear in CapCut

First check Files and make sure the file actually exists. Look in On My iPhone or the folder you chose at export. Then use CapCut’s own-audio/device import options. If M4A isn’t accepted in your version, try a new WAV export.

The voiceover ends before or after my video

Recheck the generated audio’s duration. Shorten or extend your visuals, change your script, or adjust the delivery speed in Spokio and generate a new take. Do a full preview after replacing the file.

CapCut’s music is louder than the voice

Lower the music-track volume under speech. Test on a phone speaker as well as headphones; a mix that sounds balanced with headphones can bury quiet words on a small speaker.

Can I edit the spoken words inside CapCut?

You can trim and reposition an imported audio clip, but changing the actual words is better done in Spokio. Edit the script, generate the new take, save the file, then replace the earlier clip in CapCut.

Will Spokio automatically create subtitles in CapCut?

No. The workflow exports speech audio from Spokio; you add captions separately in CapCut and proofread them against the final take.

Frequently asked questions

Can I make an AI voiceover entirely on an iPhone?

Yes. You can write the script, generate speech in Spokio, export the file to iOS Files, edit the video in CapCut, and publish—without needing a Mac.

Can I save the Spokio narration as MP3 instead?

Yes. Spokio iOS offers MP3, WAV, M4A, and AIFF for individual exports. This guide recommends M4A for a compact iPhone workflow, with WAV as a fallback when compatibility matters.

Does Spokio require an internet connection to generate the voice?

Spokio performs speech synthesis locally on your device after the app and necessary resources are installed. App downloads, updates, and publishing your finished video may still require internet access.

Can I use a cloned voice?

Only use your own voice or one you have clear permission or licensing to reproduce. For more information, see How to Clone a Voice on iPhone.

Is this only for TikTok?

No. The same narration workflow works for videos you’re editing for TikTok, Instagram Reels, YouTube Shorts, product demos, and tutorials. Platform-specific export settings and content rules still apply.

Make the voiceover first, then build the video

A repeatable iPhone workflow is simple:

Write → Generate in Spokio → Listen → Save M4A to Files → Import into CapCut → Sync → Export.

You get control over the words and voice without having to rebuild your video timeline every time you revise the script. And because the narration is a normal audio file, you keep a reusable copy beyond the current video project.

Try Spokio for iPhone to create your next AI voiceover locally. For a broader creator workflow on Mac, read AI Voiceovers for TikTok, Reels, and YouTube Shorts.