Turn a folder of images, a voiceover, and your script into a finished MP4 automatically.

BuildTuber Sync is a free Google Colab notebook that removes one of the most repetitive parts of faceless YouTube production: manually dragging and syncing hundreds of images on an editing timeline.

Just prepare:

• Your images in one continuous numbered sequence
• One final voiceover file
• Your script with one scene per line

Put everything inside one Google Drive folder, paste the folder link into the notebook, click Run All, and the tool handles the rest.

It transcribes the voiceover, matches it against your script, calculates when each image should appear, builds the timeline, and renders the final MP4 back into your Drive folder.

No manual timestamps.
No CapCut timeline dragging.
No software installation.

Works best with English and other Latin-script languages.

This is the free final-assembly tool from BuildTuber. If you want to automate the steps before this too, including image prompts, bulk image generation, voiceover generation, and asset organization, check out the full BuildTuber workflow.