Flux3Max.io is an online AI video generator built on FLUX 3 Max, the video model from Black Forest Labs and fal released in October 2026. It creates videos lasting 5 to 20 seconds with sound from a text description, a starting photo, or first and last keyframes. Output can be 720p or 1080p and can range from vertical 9:16 to widescreen. The site states it is not affiliated with Black Forest Labs or fal. The workflow has three main steps. Users describe the scene, camera movement, and sound, or select a sample idea; optionally add a photo to start from and a second photo to end on; then choose length, resolution, aspect ratio, and sound settings. The credit cost is displayed before generation. Users can play the result on the site, download an MP4, or access it in history for 30 days. Failed videos are refunded or cost nothing. Typical uses include vertical clips for TikTok, Reels, and Shorts; product shots and rotations; previsualization or filling gaps in edits; character, place, and mood scenes; and transitions between first and last frames. The service uses a credit model with no subscription, and credits do not expire. The site lists a 5 second clip at 720p for 180 credits, or 36 credits per second, and 1080p at 62 credits per second. Larger packs reduce the clip price from $1.78 to $1.50.