Veo 3's native audio is the headline feature and the biggest failure point: dialogue drifts out of sync with lips, ambient beds cut to dead air at the clip seam, and the picture still morphs — warping faces, extra fingers, cloned background extras, and flicker between generated frames. UploadCheck watches and listens to your Veo export before you post it, catching the audio/video desync, temporal artifacts, and loop seams that only show up on the second viewing.
broken videos published. Every Veo 3 generation gets one final pass, so a frozen frame or dropped word never reaches your audience.
instead of re-watching a 20-minute export. UploadCheck finds the one bad moment with its exact timestamp — no more scrubbing to hunt for it.
saved off every delivery. No re-export → re-upload → "why is there a black frame at 0:14" from a client after it went live.
It doesn't replace Veo 3 — it's the automated final QC pass on the finished export, the thing an editor can't reliably do by eye.
Same engine every way. The free scan runs 35 automated checks; a paid plan adds the AI gates (garbled speech, on-screen continuity, narration match) and lifts the hourly limit.
Use Claude Code, Codex, Cursor, or any LLM for production? Paste our one-time setup prompt and it wires a /check command. Then just say "check my Veo 3 generation" — the AI runs UploadCheck and reads back the findings. Free needs no key.
Export your video or audio from Veo 3, then drop the file into the free scan. No account, no tools — a real PASS / BLOCK verdict with timestamps in seconds.
Start free →On a paid plan, upload the Veo 3 generation straight into your UploadCheck dashboard — same engine as the free scan, with every AI gate on and no hourly throttle. Paste a link or choose a file.
See paid plans →You generate and export your generation in Veo 3 as usual, then run the finished file through UploadCheck — from the web, the CLI, or your AI assistant. UploadCheck scans it for problems Veo 3 can't check, returns timestamped flags and fixes, and you re-check until it passes.
Morphing and warped motion, temporal flicker, frozen/looped frames, cloned or duplicated subjects across a shot, audio that drifts out of sync with the video, off-target loudness, and wrong resolution/codec/frame-rate — each with the exact timestamp and a fix.
No. UploadCheck is the last step after your Veo 3 generation — one check before you publish. It doesn't touch your Veo 3 project; it inspects the finished file and hands you (or your AI) a repair list.
Yes — Veo 3's synchronized native audio is exactly what our multimodal gates are built for. The deterministic av_sync gate measures lip-and-audio drift frame-by-frame, dead_air catches the ambient bed cutting out at 8-second stitch seams, and garble flags dialogue that came out slurred or nonsensical. On the picture side, loop_freeze catches frozen frames and stitch seams while the twins oracle gate catches the cloned or morphed subjects and duplicated background extras that Veo tends to hallucinate, and gemini_watch / omni_watch watch-and-listen for the 'something's off' artifacts a single gate would miss. What we do not do is detect whether a clip was AI-generated — we assume it was, and check whether it's clean enough to publish.
Instead of re-watching a clip to hunt for the one bad moment — or worse, finding it after you've published — UploadCheck flags it in one pass with the exact timestamp. Catching one bad generation before publish saves the re-generate/re-export, re-upload, and the reputational hit of a broken clip going live.
Free with your email — 35 gates, unlimited. Add the AI gates when you're ready, from $0.025/min.