Cardboard, developed by the Cardboard team, a member of the Y Combinator W26 batch, was launched on March 24, 2026. It is the first agentic video editor that operates within a web browser. This tool is an AI-based video auto-editing solution that allows users to upload videos and specify their final production goals in natural language text. The built-in AI director comprehensively and deeply analyzes the video's visual elements and audio flow to autonomously establish an editing plan and construct a timeline. By leveraging modern browser standard technologies such as WebCodecs and WebGL2 pipelines, it organically combines cloud and browser environments to deliver fast and smooth real-time frame rendering speeds without the need for local installation of heavy applications. Traditional video editing solutions have involved cumbersome and tedious manual work, requiring users to manually cut frames and drag and drop them onto the timeline, which has been a significant barrier to entry for both beginners and busy professionals. Cardboard aims for a more natural interaction, moving away from this mechanical workflow, allowing users to interact as if they were conveying a script and intentions to a professional video director and receiving the finished product. While existing simple smart cut tools only mechanically cut out silent sections based on volume values, this tool understands visual cues from speakers and the semantic context of speech in a multifaceted way, making intelligent and creative editing decisions that do not disrupt the natural continuity of the story. This is a key differentiator. In particular, this intelligent video summarization and refinement capability can be very usefully applied in the fields of biotechnology research and academia. In long confocal time-lapse videos used for research presentations or as supplementary materials for papers, it can intelligently select and quickly edit and highlight only the important sequences where meaningful changes, such as cell division, are captured. Furthermore, in long academic presentation sessions or educational webinars on experimental protocols, it can uniformly refine frequent silences or audio noise from the presenter and quickly generate deployable video results with high-precision captioning, allowing for the addition of multilingual subtitles with a single click. The initially assembled timeline results can be exported in standard formats such as XML or EDL, ensuring seamless compatibility with Adobe Premiere Pro or DaVinci Resolve in the final mastering stage, allowing it to function smoothly as part of a professional workflow.

Cardboard, developed by the Cardboard team, a member of the Y Combinator W26 batch, was released on March 24, 2026. It is the first agentic video editor that operates within a web browser. This tool is an AI-based video auto-editing solution that allows users to upload videos and specify their final production goals in natural language text. The built-in AI director then comprehensively and deeply analyzes the video's visual elements and audio flow to independently establish an editing plan and construct a timeline. It utilizes modern browser standard technologies such as WebCodecs and W.

🔬 Automated Summarization and Cut Editing of Real-time Microscopy Imaging Timelapse Videos: Upload a 1080p 60fps timelapse video (120 minutes) of cell observation recorded on Cardboard, specify the prompt 'Edit only the cell apoptosis segments at 10x speed', and automatically extract summarized clips within 15 seconds. This process automatically creates a key presentation video for conferences in under 1 minute from the original 2-hour video, reducing conference preparation time by over 90%.