Convert text to speech and rephrase video dialog with AI
Change what they say - without changing who said it. Edit your video’s script in minutes with synced voice and lips—no reshoots, no studio time.
Modify video scripts in real-time
Need to change a line? Just update the transcript. Our AI transforms your text edits into speech, syncs the lips, and keeps your video looking seamless, like the new line was always there.
Same voice, new message
Our technology preserves the speaker's unique tone and delivery while changing what they say. Your video stays authentic—even with completely new wording.
Repurpose content without starting over
Fix a script in minutes, not days. No actors, no mics, no timelines blown. Perfect for A/B testing, product refreshes, seasonality updates, and always-on content.
AI dialog editing in action
Streamline post-production
Revitalize dated content
Scale your performance pipeline
Enter new market segments
How to edit speech in a video with AI
Upload your video and select Rephrase
Edit the auto-generated transcript
Preview changes with AI-synced lips
Download your transformed video
Can I use Rephrasing to fix or change just one sentence in a video?
Absolutely. You can update a single line of dialog or the entire script. It's ideal for replacing outdated CTAs, correcting product names, or testing new versions of a message.
Do I need a voice actor or voice recording to use this tool?
No. The AI clones the original voice and generates new speech based on your script edits—no re-recording or studio time required.
What makes this different from other text-to-speech tools?
Unlike generic voice generators, this tool allows you to edit the script of an actual video while preserving the speaker’s voice and syncing lips to the new audio. It’s made for marketers, not just creators.
Is there a free text-to-speech tool I can use?
Yes! Content Lab offers a free version of its AI text-to-speech and dialog rephrasing tool. You can test script edits, voice generation, and lip syncing without any upfront cost.
Can I use text-to-speech online without downloading anything?
Absolutely. Content Lab runs entirely in your browser, so you can convert text to voice, edit scripts, and sync video and audio online, no software download required.