What audio format should I use for video voiceovers?

Use WAV for editing (lossless, no quality loss on import). Use MP3 for simpler projects where file size matters. Always use 48kHz sample rate — this is the video standard and prevents sync drift.

How do I sync voiceover timing with video?

The best approach is to create your voiceover first, then edit your video to match the narration. Use timeline markers at key visual moments. Align narration with cuts and transitions rather than timecode.

Can I use AI voiceover on YouTube, TikTok, and Instagram?

Yes. All major platforms allow AI-generated audio. YouTube explicitly allows AI voiceover for monetized content. SpeechGeneration AI includes full commercial use rights with no attribution required.

How do I remove original audio before adding voiceover?

In most editors, right-click the video clip and choose Detach Audio or Unlink Audio, then delete the audio track. In CapCut, tap the video clip, go to Volume, and set it to 0.

Why is my voiceover out of sync with the video?

The most common cause is a sample rate mismatch. Ensure your voiceover is exported at 48kHz, not 44.1kHz. Check that your project settings match your media settings in your video editor.

How long should a YouTube voiceover be?

Tutorials: 80–90% audio coverage. Vlogs: 40–60%. YouTube Shorts: under 60 seconds. A useful rule of thumb: 150 words equals approximately 1 minute of narration.

Can I add voiceover to video on my phone?

Yes. Open SpeechGeneration AI in your mobile browser, paste your script, generate, and download the MP3. Then import it into CapCut or InShot on your phone to align with your video.

How do I balance voiceover and background music volumes?

Keep background music at -30 to -35dB and your voiceover at -16dB (LUFS). Use auto-ducking features in Adobe Premiere Pro (Essential Sound panel) or DaVinci Resolve to automatically lower music when the voice plays.

Should I record my own voice or use AI voiceover?

AI voiceover delivers consistent quality, supports multiple languages, and is fast to produce. Recording your own voice adds personal brand and unique character. Many creators use AI voiceover for drafts and high-volume content, then record their own voice for flagship videos.

Video Editor Guide

How to Add a Voiceover to Video: Step-by-Step for Every Editor (2026)

Generate professional AI voiceovers and add them to CapCut, Premiere Pro, DaVinci Resolve, iMovie, or InShot in minutes

Quick Answer

Two steps: (1) Generate your voiceover — use SpeechGeneration AI to turn your script into natural-sounding audio (free, 10K characters, no credit card). (2) Import the audio into your video editor and align it with your visuals. Below we cover exact steps for CapCut, Premiere Pro, DaVinci Resolve, iMovie, and InShot.

Generate Free Voiceover See Pricing

10,000 characters free • No credit card required • Commercial use included

What You Need Before You Start

Your video file
A voiceover script
AI voiceover tool: SpeechGeneration AI (free, 10K chars, no credit card) — or record your own voice
Your video editor (CapCut, Premiere Pro, DaVinci Resolve, iMovie, or InShot)
Optional: headphones for precise audio alignment

Part 1 of 2

Generate Your Voiceover (3 Steps)

Before you open your video editor, create the voiceover audio file. This takes under 5 minutes.

Write Your Voiceover Script

•Time your script to your video at roughly 150 words per minute
•Keep sentences short — they sync better with visual cuts
•Watch your video on mute and narrate aloud first to test pacing

Pro tip: Narrate aloud while watching your video on mute before writing your final script. This reveals where pauses should naturally fall.

Generate with SpeechGeneration AI

•Go to speechgeneration.ai and paste your script
•Select a voice matching your video's tone (95+ voices, 70+ languages)
•Choose quality: Studio (1×) for most videos, Studio+ (2×) for premium
•Download as MP3 (smaller file) or WAV (lossless, best for post-production)

Pro tip: For sections requiring different tones (e.g., excited intro vs. calm tutorial), generate each section separately for better control.

Generate Free

Prepare Your Audio File

•Rename files descriptively: intro-voiceover.mp3
•Optional: trim leading/trailing silence in Audacity
•Use 48kHz sample rate — the video industry standard

Pro tip: Export as WAV if your editor compresses audio on import — WAV is lossless and preserves full quality through post-production.

Part 2 of 2

Add Voiceover in Your Video Editor

Select your editor below for exact steps.

CapCut

Free — Desktop & Mobile

1Open your project in CapCut and import video to the timeline.
2Click "Audio" in the toolbar, then "Import" (desktop) or the "+" button (mobile).
3Select your voiceover MP3 or WAV file.
4Drag the audio clip to the audio track below the video.
5Align the start of the voiceover with the corresponding video moment.
6Adjust volume: click the audio clip and use the Volume slider.
7Add fade in/out — a 0.3s fade smooths transitions.
8Export with audio included.

Pro tip: CapCut has built-in AI text-to-speech, but SpeechGeneration AI provides higher quality and more voice options.

6 Pro Tips for Voiceover-to-Video Sync

Apply these techniques to get polished, professional results every time.

1
Create your voiceover first, then edit the video to match — this produces tighter, more professional content.
2
Match sample rates: use 48kHz for all video projects to avoid sync drift.
3
Music should be 15–20dB below your voice — lower background music to -30 to -35dB.
4
Use 0.3-second fades at every edit point — hard audio cuts are jarring for listeners.
5
Sync to visual beats, not timecode — align narration with cuts and transitions.
6
Leave breathing room — silent moments of 0.5–1 second between sections feel natural.

Tool Recommendations

The right tool for each part of your voiceover workflow.

Need	Recommended Tool	Why
Generate voiceover	SpeechGeneration AI	95+ voices, 3 quality tiers, 70+ languages, free to start
Free video editing + AI voices	CapCut	Built-in AI voices + full editor, completely free
Professional editing	DaVinci Resolve (free)	Professional-grade editing + Fairlight audio suite
Quick mobile editing	InShot	Intuitive, fast, great for social media content
All-in-one (voices + video)	Clipchamp	400 AI voices + editor, free with Microsoft 365

Generate Your Voiceover for Free

10,000 characters, 95+ voices, no credit card required. Generate professional audio and import it into your video editor in minutes.

Start Free — No Credit Card

Commercial use included • MP3 & WAV export • Works with all video editors

Frequently Asked Questions

Yes. SpeechGeneration AI gives you 10,000 characters free (no credit card required), CapCut is completely free, and DaVinci Resolve has a free tier. Combined, the total cost is $0 to get started.