Does the face stay the same?

The AI is told to keep identity, features and age, and move only the mouth, cheeks and eyes. Smiles change the whole lower face a little, so compare with the slider.

Yes. Every AI image tool here is free to use, with or without an account, and there is no watermark. You get 10 images a day without signing in and 30 a day with a free SandBase account. The allowance resets at midnight UTC.

Are my photos stored?

No. Your photo is sent to the image model for this one request and the result comes straight back to your browser. Nothing is saved to a gallery. A copy of the result is kept in a short-lived cache for 24 hours so that pressing the button twice does not use two runs.

Does it work on my phone?

Yes. The tools work in any modern mobile browser. Tap the upload area to pick a photo or take one with the camera, then download the result to your photos.

Free · no sign-up

Free add smile to photo tool

Turn a serious expression into a natural smile: gentle, bright or a full laugh, with the face, hair and everything else kept exactly the same.

100% free
No sign-up
No watermark
Works on phone

Sample result

Example

BeforeAfter

A neutral expression changed to a warm smile.

How to use the Add Smile to Photo

Three steps, on a computer or a phone.

1. Upload a photoDrop, paste or pick a JPG, PNG, WebP or HEIC photo. On a phone you can take one with the camera.
2. Choose your optionsSet the options, then press the button. It takes about 20 seconds.
3. Compare and downloadDrag the slider to compare with the original, then download the result.

What people use it for

Group photosFix the one shot where someone looked stern.
Profile picturesA friendlier look for a team page or a profile.
Old picturesWarm up a stiff formal portrait.

More free AI image tools

All free, no sign-up, no watermark.

Need more control? Use the API

This tool runs on the SandBase image API. The API gives you every setting the free tool fixes for you.

Higher quality and sizequality=high, sizes up to 2K, and transparent backgrounds in one call.
Your own promptChange the template below, add reference images, or batch hundreds of images from your code or Agent.
No daily limitPay per image from one SandBase balance, with the same key for 2,000+ models and APIs.

API reference Image models and prices Get an API key

curl https://api.sandbase.ai/v1/images/edits \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -F "model=gpt-image-2.6-flare" \
  -F "[email protected]" \
  -F "quality=high" \
  -F "size=2048x2048" \
  -F 'prompt=Change the person'\''s expression to a gentle, closed-mouth smile. Keep the face shape, identity, age, skin tone, hair a…'

The free tool uses this prompt template with your choices filled in.

Frequently asked questions

Does the face stay the same?: The AI is told to keep identity, features and age, and move only the mouth, cheeks and eyes. Smiles change the whole lower face a little, so compare with the slider.
Is it really free?: Yes. Every AI image tool here is free to use, with or without an account, and there is no watermark. You get 10 images a day without signing in and 30 a day with a free SandBase account. The allowance resets at midnight UTC.
Are my photos stored?: No. Your photo is sent to the image model for this one request and the result comes straight back to your browser. Nothing is saved to a gallery. A copy of the result is kept in a short-lived cache for 24 hours so that pressing the button twice does not use two runs.
Does it work on my phone?: Yes. The tools work in any modern mobile browser. Tap the upload area to pick a photo or take one with the camera, then download the result to your photos.