Vidu Q4: Image to Video Online

Every row below comes from VdoBloom's model configuration, the Vidu Q4 endpoint and the credit table, not from a launch post. The two rows people get wrong most often are aspect ratio (there is no control in this mode) and length (any whole second from 4 to 15, not fixed steps).

The meter is linear: seconds times 6.08 credits at 720p or 7.68 at 1080p, rounded up once at the end. Because the slider moves one second at a time, you pay for exactly the length you set. A 6-second 1080p clip (47 credits) costs less than a 10-second 720p clip (61 credits), so a short shot can usually afford the higher resolution. The dollar figures use the Lite plan rate of $15 for 300 credits ($0.05 a credit); on a one-time pack ($19.50 for 300, never expiring) the same clips cost about 30% more in dollars, with nothing to cancel.

New accounts get 10 free credits. That does not reach the 25-credit minimum for Vidu Q4, so plan on a top-up before the first render.

All three sit in the Image to Video picker, so switching is one dropdown. Vidu Q3 Turbo is the cheapest of the three per clip and the only one that reaches 16 seconds, but it offers just three lengths (5, 8 or 16 seconds) and its audio is an opt-in toggle. Kling 3.0 in standard mode is billed per second like Vidu Q4 and is slightly cheaper silent (5.6 credits a second against 6.08), but adding sound lifts it to 8.0 a second, above Vidu Q4's 720p rate, which already includes audio. Vidu Q4's advantage is the combination: any length from 4 to 15 seconds, audio on every job and one flat rate per resolution.

Vidu Q4 appears twice in the picker, and the two modes answer different questions. Image to Video starts from a picture you already have and makes it move; the photo is the shot. Reference to Video starts from a description and uses up to nine uploaded images to pin down what the people, products or places in it look like; the shot is built new. Both modes share the same 4-15 second range, the same two resolutions and the same per-second price, so the choice is about the input, not the budget.

Vidu Q4 is an image-to-video model only. It does not appear in the Text to Video picker, because every job needs a photo.

The photo already fixes the subject, the clothes, the light and the framing, so the prompt should spend its words on what changes. Name the subject's action first, then the camera: "she turns toward the window and smiles, slow push-in" does more than a paragraph re-describing the room. Give one clear action per 4-6 seconds; a 15-second clip with a single verb tends to drift or repeat, while a 15-second clip described in three beats (what happens early, in the middle and at the end) gives the model something to fill the time with.

Because audio is on for every dashboard job, it is worth one sentence on sound: ambience, a footstep rhythm, or that the scene should stay quiet. Draft at 4-5 seconds and 720p (25-31 credits) until the motion reads, then re-run the identical photo and prompt at the final length. Crop before uploading: if the photo is landscape and the post is vertical, the fix is in the photo, not in the settings.

There is no aspect-ratio control in this mode, so a mismatched photo means a mismatched video; crop first or use Reference to Video. The dashboard offers 720p and 1080p only; no 4K. Audio cannot be switched off from the dashboard, which matters if you plan to replace the soundtrack anyway (you can mute or replace it in your editor; the price is the same either way). The 10 free signup credits do not cover the 25-credit minimum. Lengths stop at 15 seconds; for a 16-second single take within the Vidu family, Vidu Q3 Turbo or Vidu Q3 reach 16 at fixed steps.

Vidu Q4 is a proprietary Shengshu model run through VdoBloom's provider route, not downloadable weights, so availability depends on that provider; when a job fails there, the credits come back automatically. VdoBloom does not rank models on subjective quality. Everything above is spec and price; whether Vidu Q4's motion suits your photo is something a 25-credit draft answers faster than any review.