Lengths, formats and quality

#The stretch you revise

• Up to 60 seconds per revision. Your clip can be longer — you choose which seconds with the window on the timeline. If you push past the limit, the window slides instead of growing. The timeline always holds the exact limit.
• Your film is the stretch you chose. Revising the middle of a longer clip gives you a film of those seconds, with their own sound.
• Right to the end. A stretch can run to the very end of your clip; it ends on the clip's last frame.
• If a stretch is too short to revise, the timeline says so and asks for a longer one.

#Video files

If a file is refused, the page says why — for example "File type not allowed". See Upload problems.

#Pictures you add

Pictures show Optic what something should become — a person, a garment, an object, a logo. Each is the whole new look: everything it shows of the subject comes into your video — see Your picture is what you want.

• Formats: JPEG, PNG, WebP and GIF. Photos from a phone in HEIC are converted for you.
• How many: up to 9 in one revision. The Add chip counts the pictures you added and how many fit. If you add more than fit, Optic says how many it had room for. Within that, a revision is never turned down for carrying too many pictures.
• Pictures can be added once the range is confirmed. They are named Image 1, Image 2 and so on, in order; drag to reorder them and your @Image mentions follow.

#Your words

The words box takes up to 40,000 characters. A counter appears when you pass 36,000. Most good prompts are a few sentences — see Writing Optic prompts.

#The film's quality

Choose Quality before you press Revise: 720p or 1080p. It starts on 720p; 1080p costs more. Changing the quality changes the price you see.