Guides · Generative AI

AI Avatar Video with Lip Sync: Free Tools and Steps (2026)

By Ravindra Bagale, trainer · LinkedIn · Published: 23 October 2026 · Last updated: 23 October 2026 · 10 min read

An AI avatar video with lip sync is a short clip where a photo or stock presenter appears to speak your script, with the mouth moving in time with the audio. On free plans you can try this today with HeyGen (up to about 3 videos a month, up to 1 minute each, watermarked), Synthesia Basic (about 10 minutes a month, watermarked, stock avatars) or Sync Labs (3 short lip-sync jobs a month, up to 20 seconds). Use only your own face and voice, or get clear written consent. Never make a deepfake of someone else.

1. Suppose Priya needs a product intro without a camera

Suppose Priya sells handmade candles in Pune on Instagram. She wants a 20-second talking video for her new lavender jar, but she does not want to set up lights and a tripod. She uploads her own clear photo to an AI avatar tool, pastes a short script, and gets a clip where her face appears to speak the words. That mouth movement matching the audio is called lip sync.

2. What is an AI avatar video with lip sync?

Three common ways people make these clips:

1. Photo + script → the tool builds voice and moves the mouth (HeyGen photo avatar, many D-ID flows).
2. Stock avatar + script → you pick a ready-made presenter (Synthesia Basic).
3. Existing video + new audio → the tool re-fits the mouth to new speech (Sync Labs).

3. Free tools compared (checked on 23 October 2026)

Plans change. Open each pricing page before you rely on a number.

HeyGen Creator starts at about $29 a month and removes the watermark. Synthesia Starter starts at about $29 a month billed monthly. Prices and limits change: check heygen.com/pricing and synthesia.io/pricing.

4. Worked example 1: a 20-second product intro in HeyGen

1. Open HeyGen and create a free account (no card needed to try).
2. Choose a photo avatar and upload only your own clear, front-facing photo (good light, mouth closed or soft smile, no other people in frame).
3. Paste this script (keep it under one minute on Free):

Hello, I am Priya from Pune. This is our new lavender soy candle.
It burns for about thirty hours. Soft scent, no strong smoke.
Order on Instagram. Thank you for supporting a small home business.

4. Pick a calm English voice, or a voice that matches your language if the free language list includes it.
5. Generate the video. Watch it once with sound off (mouth shapes) and once with sound on (words).
6. If Free leaves a watermark, use the clip for a private draft or test; remove branding only on a paid plan if you need a clean public post.

Expected output (yours will be similar, not the same): a short talking clip of Priya's photo, lips moving with the script, HeyGen mark on Free, length well under 1 minute.

5. Worked example 2: a Marathi greeting with a Synthesia stock avatar

Priya also wants a polite Marathi line for local customers, but she does not want to upload her face to a second tool today.

1. Open Synthesia and stay on the free Basic plan.
2. Pick a stock avatar (Basic is built around stock presenters; personal avatars are a paid-plan feature).
3. Paste:

Namaskar. Mi Priya. Amchi lavender candle Instagram var available aahe.
Order karnyasathi bio madhil link bagha. Dhanyavad.

4. Choose a Marathi or multilingual voice if your account lists it; otherwise write the same meaning in simple English and add Marathi captions yourself in CapCut or InShot later.
5. Generate and preview. Expect a Synthesia watermark on Basic.

Expected output: a short stock-avatar greeting. Good for practice and internal demos. For a public brand face, prefer your own consented photo on a tool that supports photo avatars, and label the post as AI.

6. Worked example 3: re-sync a clip with Sync Labs

Suppose Priya already has a 15-second phone video of herself speaking English, and a cleaner audio file of the same lines. She wants the mouth to match the new audio.

1. Open Sync Labs and use the free trial (3 generations a month, no card).
2. Upload the video and the new audio. Keep both under 20 seconds on the free trial (15 seconds if you use sync-3).
3. Run lip sync and download the result.
4. Check teeth, chin and edges. If the face warps, shorten the clip or use a more front-facing take.

Expected output: the same video frames with mouth motion closer to the new audio. This is re-sync, not a full avatar studio.

7. Worked example 4: time your script with Python (real output)

Free plans care about seconds. This small script estimates spoken length at about 2.5 clear English words per second.

# Estimate spoken seconds from a short avatar script (about 2.5 words per second).
def spoken_seconds(script, words_per_sec=2.5):
    words = [w for w in script.replace("\n", " ").split() if w]
    secs = round(len(words) / words_per_sec, 1)
    return len(words), secs

script = """Hello, I am Priya from Pune. Today I will show three free ways
to make a short AI avatar video with lip sync. Use only your own photo,
keep the script under forty seconds, and always label the video as AI generated."""
n, s = spoken_seconds(script)
print("WORDS:", n)
print("ESTIMATED SECONDS:", s)
print("FITS_FREE_HEYGEN_1MIN:", s <= 60)
print("FITS_SYNC_FREE_20S:", s <= 20)
print("TRIM_TO_20S_WORDS:", int(20 * 2.5))

Real output (23 October 2026):

WORDS: 42
ESTIMATED SECONDS: 16.8
FITS_FREE_HEYGEN_1MIN: True
FITS_SYNC_FREE_20S: True
TRIM_TO_20S_WORDS: 50

Change the script and run again before you spend a free generation.

8. Consent, labels and what never to do

• Only your face and voice, or written consent from the person (date, name, what you may post).
• Do not make a politician, celebrity, teacher, boss or relative "say" words they never said.
• Label the post: "AI avatar video" or "synthetic video" in the caption.
• Keep originals: save the photo and the script file.
• Children: a parent or guardian must control the account and posting.
• If someone sends you a scary "your relative is speaking" clip, treat it as a possible scam and read Deepfake and AI Voice Clone Scams: How to Spot Them.

9. Beginner mistakes and quick fixes

10. Try at home

Recap

Short script, your own face, check the lips, label the post. That is an honest AI avatar video.

Image to video next: Image-to-Video Explained · Related guide: AI Video from a Photo: Free and Paid Ways · Next idea: How to Make AI Videos for YouTube for Free

Ravindra Bagale, trainer: linkedin.com/in/ravindra-bagale. Priya and her candle shop are made up for learning. HeyGen, Synthesia, Sync Labs and D-ID plan limits were checked on their official pricing or help pages on 23 October 2026 and can change. The Python output was produced on 23 October 2026.