Upload your clip, paste your script, pick from 400+ voices, and download a finished MP4 with professional AI audio muxed in. No studio, no recording setup, no editing software. TikTok-ready in three minutes.
Free to try, no signup. Full videos and a commercial license on Creator ($39/mo). Lifetime Creator also available.
The only TTS tool that muxes your audio directly into your video file. You upload one file. You download one file. No third-party video editor, no manual syncing.
Why it matters on a sound-first platform
TikTok's algorithm weights watch behavior over follower count. Clear voiceover that explains visuals in the first two seconds increases completion rate, and higher completion rate is the single biggest signal that drives organic reach on the platform.
TikTok has roughly 2 billion monthly active users. Around 23 million videos are uploaded every day. The platform is explicitly sound-first: 80% of TikTok videos are watched with sound on, compared to under 20% on Facebook. What that means practically is that the audio layer of your video is doing more work than the visual.
But recording quality voiceover on every video is genuinely difficult. Background noise, inconsistent microphones, plosives, and the awkwardness of recording yourself narrating out loud in a studio voice all get in the way. Most creators either skip voiceover entirely or use TikTok's three built-in voice options, which now sound generic because every other creator uses them too.
AI voiceover with 400+ voice options solves this. You write the script in text. You pick a voice that fits your brand. You get professional audio back in 30 seconds without a microphone or a recording session. Faceless channels, in particular, have built audiences in the millions using exactly this workflow.
Match voice to content
The voice style should match the content type and the audience's expectation going in. Getting this wrong is the most common mistake with AI voiceover.
Fast pace, short punchy sentences, rising intonation. Keeps completion rate up on fast-scroll content.
Chronological, suspense-driven, clear setup and payoff. Pulls watchers through longer clips.
Quiet, close-mic feel. Emphasizes ambient sound. High dwell time on process content.
Confident cadence, neutral emphasis, crisp pacing. Boosts credibility on information-heavy content.
One rule worth knowing: the voice style signals content type before the viewer consciously processes anything. An energetic voice on a slow cooking video confuses the viewer. A soft ASMR voice on a finance commentary makes it feel unprofessional. Match first, optimize speed second.
Step by step
The full workflow, from raw clip to finished MP4 ready to post. Three to five minutes total after you have done it once.
Drag your MP4, MOV, or MKV file into the AI Voiceover tool at freetts.org/add-voiceover-to-video. Any length under the plan limit works. Vertical 9:16 and horizontal clips both upload fine. No need to edit or trim first.
Write your script before you upload. Short punchy sentences read better at TikTok speeds. Front-load the hook in the first five words. The tool syncs your audio to the video length, so match the script word count to your clip duration roughly: 150 words per minute at 1.0x, 200 words per minute at 1.3x.
Browse 400+ voices or filter by accent, gender, and style. Energetic US voices work for fast-paced punchy content. Warm neutral voices work for storytelling and mini-docs. ASMR voices work for slow process content like cooking, packing, and art. Preview the voice before you commit.
Two modes. Replace: strips the original audio and replaces it entirely with your voiceover. This is right for faceless video, slideshow content, and clips where the original sound was ambient noise. Talk over: mixes your voiceover over the original audio at a set volume ratio. Right when you want background music or ambient sound to stay in.
Click Generate. The tool combines your video and audio, then gives you a finished MP4 ready to upload directly to TikTok. No editing software needed. No exporting, importing, synchronizing in a separate app. One file, ready to go.
The script is everything
TikTok voiceover scripts need a hook in the first five words, a value delivery within the first eight seconds, and a pattern interrupt every 20 to 25 seconds to reset attention.
The biggest mistake is writing a voiceover script like a regular paragraph. TikTok consumption is fast. People decide to stay or leave in the first two to three seconds. Your first sentence needs to create a question or a tension the viewer wants resolved.
Start with the most interesting thing about the video. Not the intro. Not the context. The thing that makes someone stop scrolling. "I almost missed this" or "Here is why everyone is doing it wrong" outperform any descriptive opener.
TTS reads best when you alternate short punchy sentences with longer explanatory ones. Three words. Then sixteen. Then four. This rhythm feels natural at 1.1x to 1.3x and keeps pace from getting monotonous.
Generate the audio first. Listen to the length. Then record or edit the visual to match. Trying to fit audio into a pre-existing visual frame is harder and looks amateur when the sync is off.
Periods create short pauses. Question marks change inflection. Commas create breathing room. Write punctuation deliberately because it directly changes how the TTS reads the line. Read it back mentally before you generate.
Punchy product content: 1.2x to 1.4x. Narrative storytelling: 1.0x to 1.1x. ASMR and process content: 0.85x to 0.95x. News and commentary: 1.1x to 1.3x. Adjust after you hear the first output.
Put your CTA in the last five seconds. Not in the middle. Not up front. Viewers who make it to the end are the ones most likely to act. Front-loading the CTA just tells people who are leaving early what to ignore.
What makes it different
Three options most creators consider. They are not interchangeable. Here is what each one actually does and where it falls short.
| Tool | Voices available | Mux video + audio | Speed control | Voice cloning | Price |
|---|---|---|---|---|---|
| FreeTTS AI Voiceover | 400+ | Yes, built-in | 0.5x to 3x | Yes (Creator) | $39/mo Creator |
| TikTok built-in TTS | 3 to 5 | Yes, in-app | No | No | Free (in TikTok app) |
| CapCut TTS | ~20 | Yes, in editor | Limited | No | Free basic, paid Pro |
| ElevenLabs + manual mux | 1000+ | No, manual in editor | Yes | Yes | $5 to $99/mo |
The main argument for FreeTTS over ElevenLabs for TikTok specifically: the muxing step. ElevenLabs generates great audio but you still have to import it into CapCut, Premiere, or another editor, sync it, and re-export. The FreeTTS AI Voiceover tool handles upload and mux in one step. For high-volume creators posting daily, that time difference adds up.
What you need to get started
The AI Voiceover tool is on Creator. If you are posting consistently and want the full workflow including video muxing and voice cloning, Creator is the right tier. PRO covers all other TTS use including audio-only downloads, PDF to audio, and standard generation.
Common questions
More FreeTTS tools
Last updated May 2026. TikTok statistics sourced from platform disclosures and third-party analytics reports (2025-2026). Engagement data from social media benchmark reports. Related guides: Add Voiceover to Video, Voice Cloning, Best TTS for YouTube.