One birthday role
Your photo becomes the central adult while the hands carrying cakes stay in the scene.
The selected birthday surprise
A close birthday scene with two cakes, lit candles, gold 21 balloons and the blue party hat being lifted away. About 6.1 seconds.
Her photo in the candle-blowing moment
Happy Birthday Sister AI creates a short birthday scene from one consenting adult’s photo. Two decorated cakes arrive in front of the seated birthday person, gold number balloons sit above the scene and the camera stays close enough to catch the candle-blowing expression.
The playful finish is already part of the reference: a hand takes away the blue party hat. Your photo replaces the central birthday person, while the cakes, balloons, helping hands and dark-curtain setting stay with the selected take.
The complete reference window is about 6.1 seconds. It becomes a vertical 9:16 MP4 at 720p with the sound from the same scene. Use it as a short message for your sister, an adult sibling or a friend who agreed to appear.
Two cakes, a wish and the hat surprise
The scene is built around one visible birthday role. Add a single clear photo of the adult who should sit behind the cakes. Their face, hair, body appearance and visible outfit come from that photo; expressions, mouth movement and timing come from the reference.
The helping hands keep their original roles as the cakes move into place and the hat comes off. You do not need to upload photos for the people outside the frame. Keeping that distinction helps the birthday person stay recognizable during the close interaction.
The cakes, candles and gold 21 balloons are fixed reference props. This page has no name field, age selector or editable candle numbers. Watch the example first to decide whether this particular party setup suits the greeting you want to send.
Send the downloaded clip with a personal birthday line in your message or caption. The video itself follows the selected visual sequence and reference sound; it does not generate a new spoken birthday message.
A little party moment from one photo
A reaction that moves
The reference supplies the candle-blowing face and hat-removal finish instead of a still-photo slideshow.
A compact video greeting
Download about six seconds of vertical video with the selected reference audio.
Make the birthday clip
Choose her photo
Use a clear image of the adult birthday person, with the face and upper-body outfit visible.
Confirm and generate
Confirm permission and start the two-cake scene for 10 credits. A low balance opens the credit-pack dialog first.
Send the party moment
Check the face, candles and helping hands, then download and send the MP4 with your own message.
Keep her face clear beside the cakes
- Use an evenly lit photo with one adult facing the camera.
- Show the upper body and the clothes you want at the table.
- Avoid a hand over the mouth, heavy filters or a face hidden by hair.
- Watch the fixed cakes and 21 balloons before choosing this reference for the greeting.
- Only upload yourself or adults who agreed to appear. Do not use photos of celebrities, public figures or strangers.
Birthday sister video questions
How do I make a Happy Birthday Sister video from her photo?+
Add one clear photo of your adult sister with her permission, confirm the consent box and generate for 10 credits. The selected take supplies the party moment; download the MP4 and send it with a personal message.
How many photos does this template need?+
One adult photo for the central birthday person. The people holding cakes and removing the hat remain outside or at the edges of the reference, so no other portraits are required.
Can I change the age or the name on the cake?+
The reference uses its existing cakes, candles and gold 21 balloons. This page has no name or age controls. Put a separate name or greeting in your message when you send the clip.
Will she keep the outfit in the photo?+
The uploaded photo supplies the adult’s face, hair, body appearance and visible clothes. The blue party hat is part of the birthday scene. Use a photo that clearly shows the look you want at the table.
What happens in the birthday video?+
Hands bring two cakes into the close shot, the birthday person follows the candle-blowing moment, and a hand lifts away the party hat. The entire short sequence follows the selected example.
How long is the clip and what format is it?+
The complete selected scene is about 6.1 seconds, at its original pace. The download is a vertical 9:16 MP4 at 720p.
Does it create a new birthday song or spoken message?+
The clip keeps the sound of this exact reference. There is no custom speech or song field. Add your own personal words in the message or caption you send with it.
Is the birthday video free?+
Each generation costs 10 credits. You can watch the reference first. If your balance is below 10 credits, the credit-pack dialog opens before generation starts.
Can I make this for someone other than my sister?+
You can use one photo of any adult who agreed to appear. Choose this page when the two-cake setup and fixed reference props match the greeting you want.
What if generation fails or I close the tab?+
Return to this template or My creations to check the saved task. Confirmed failures show their error and return the generation credits automatically.
Send her the cake moment
One photo gives the short party surprise a familiar face.