How to Add an AI Voiceover to a YouTube Video for Free

You can add an AI voiceover to a YouTube video for free by generating your script as speech in a text-to-speech tool, downloading it as a WAV file, and dropping that file onto your video editor's audio track. No microphone, no recording booth, no editing experience required beyond what you already use to cut the video.

1. Write the script first, not the video

Write out exactly what the narrator says, as plain text, before you generate anything. TTS narration reads punctuation literally — commas create pauses, periods end sentences cleanly — so a script written for reading aloud produces better pacing than a script written for a teleprompter.

2. Generate the voiceover

On HixCodeTTSv1, paste the script into the text-to-speech tool, pick a voice from the 218-voice library — American or British, male or female — set your playback speed, and generate. Free accounts can generate up to 1200 characters per request; if your script runs longer, split it by scene or paragraph and generate each part separately.

3. Download and import the WAV

Every clip downloads as a WAV file — a lossless format that edits cleanly without the quality loss you'd get re-compressing an MP3. Drag it onto your video editor's audio track (DaVinci Resolve, CapCut, Premiere, or any editor that accepts standard audio files all handle WAV natively) and align it against your footage.

4. Sync and mix

Trim silence at the start of the clip so it doesn't lag behind your first cut, and duck your background music under the narration by 6-10dB so the voice stays intelligible. If a line needs re-recording, regenerate just that sentence rather than the whole script — it's faster and keeps the rest of your timeline untouched.