AI sound effects and foley timed to your video

An online tool that adds sound effects to video: the AI analyzes each scene frame by frame and creates foley — footsteps, splashes, hits, crowd noise, room tone — timed to the action. Made for silent clips, AI-generated videos and edits where the original audio is unusable.

How to add sound to a video

1
Choose a video

The tool prepares it and finds the scene changes on its own.

2
Check the sounds

The AI describes what each scene should sound like — adjust it in your own words and pick an engine.

3
Voice and download

Listen together with the picture, set the volume and download an MP4 with sound.

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Give a silent clip its sound: the AI picks it frame by frame

Choose the video you want to add sound to
It can be silent. One pass voices a part of up to 3 min.
MP4, WEBM, MOV, MKV, AVI, WMV, FLV, 3GP ·

Examples: before and after

Real results of this tool. The source clips were silent — press “With AI sound” to hear what the AI added.

🍳 Bacon in a pan

What the AI heard: bacon sizzling in a frying pan, a wooden spatula scraping, a gas burner hissing, kitchen ambience

Engine: Effects

⌨️ Typing on a keyboard

What the AI heard: fast typing on a mechanical keyboard, plastic clicks in a quiet room

Engine: Detailed

🎆 Fireworks over the city

What the AI heard: fireworks bursting, distant booms, crackling and whooshes in the open air

Engine: Detailed

🍅 Slicing a tomato

What the AI heard: a knife slicing a juicy tomato, soft squishes, wet thuds on a wooden board

Engine: Effects

🚦 A busy crossing

What the AI heard: city traffic, car engines and horns, a distant siren, footsteps on the pavement

Engine: Studio · 2 takes

🏀 Basketball dribbling

What the AI heard: a basketball bouncing rhythmically on concrete, an outdoor court

Engine: Effects

⛲ Kids at a fountain

What the AI heard: splashing water, footsteps on wet ground, a distant city

Engine: Detailed

🥊 Punching bag

What the AI heard: heavy punches into a bag, glove impacts, gym ambience

Engine: Detailed
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Features

Sound synced to the picture
A step, a ball bounce or a splash sounds exactly when it happens on screen: the AI watches the video itself, not just a description.
Scene-by-scene analysis
The tool finds shot changes, the AI describes the sounds of each scene, and you can edit every description in your own words.
Three engines to choose from
Detailed, affordable effects-focused and studio with two takes — the price is shown before you press the button.
Re-voice a single scene
Not happy with the sound in one spot — replace just that scene and pay only for it.
Music and your own mix
Add background music, keep the clip’s original sound and set the level of every layer before downloading.
Picture without loss
The final MP4 is built in the browser: the soundtrack is placed next to the picture, and the picture itself is not re-encoded.

What you can do

  • Add sound to a silent clip or an AI-generated video
  • Replace poor original audio with clean effects and ambience
  • Add background music under the sound effects
  • Compare several takes and pick the best one for each scene
  • Download the video with sound or the soundtrack alone

Input and output

Input: MP4, MOV, WebM, MKV and other formats your browser can open. Output: MP4 with sound (for MP4 and MOV the picture stays as it was), the sound alone as WAV, and every take as WAV and MP3 in “My generations”.

Why this tool

The sound is made from the video itself and lands on the action; scenes are described automatically and edited in plain words; three engines with the price shown up front; re-voicing one scene instead of the whole clip; a mix with music and the original sound; a final video with the picture untouched. A failed generation does not use tokens.

Frequently asked questions

Will the AI voice speech if people talk on screen?

No: these models create sounds, not words, and talking comes out as unintelligible chatter. That is why “No voices or speech” is on by default. “Detailed” follows it reliably, while “Effects” and “Studio” sometimes still add chatter in scenes with people — pick “Detailed” for those. If your clip needs words, voice the text with text to speech and lay it on top.

How do the three engines differ?

“Detailed” (Sonilo) covers the whole part in one pass with a separate description for every scene — it is the best at matching the meaning of a scene. “Effects” (Kling) puts footsteps and hits exactly on the frame and costs less, but sometimes leaves quiet actions silent. “Studio” (Mirelo) always returns two different takes — you pick the better one.

What if the sound in one scene does not fit?

Press “New sound for this scene” in its row: only that scene is re-voiced, and the price covers only that scene. The previous version is kept — you can switch between takes and compare them right on the video.

Can I keep the clip’s original sound?

Yes. If the video has its own track, it appears as a separate layer under “Volume”: you can turn it down under the effects or remove it. Outside the voiced part the original sound stays as it was.

My clip is longer than three minutes — how do I voice all of it?

Pick the first part of up to three minutes on the strip and voice it, then pick the next one. Every voiced part lands in its place, and the final file has sound across the whole clip.

Can I use the sound in my own videos, including commercial ones?

Yes, as part of your work — videos, games, ads. The sound is not exclusive: another person with a similar video may get a similar result. The files are labeled as AI-generated.

💡 Want us to improve this tool just for you?

We can! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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Who is this tool for?
🎛️ Sound Engineers 🎬 Video Creators 📡 Streamers & Broadcasters ✨ Content Creators 🎮 Gamers 📚 Educators & Teachers

By uploading content you confirm that you are entitled to disclose its contents to third parties, and you undertake not to include other people's personal data in it. See the Terms of Use for details. AI providers Tembrica is an independent product. We are not affiliated with, endorsed by or sponsored by the makers of the models and services listed here; their names are used only to say factually which engine runs a given tool.

This result was generated by a neural network. Any rights that could arise on our side pass to you — perpetually, with no usage fees and no limits on territory, print run or manner of use, commercial use included. The rights are non-exclusive: another user may obtain a similar result. Crediting Tembrica or linking back is not required. The file carries a machine-readable AI-origin marker in its metadata. More in the Terms of Service

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