Codex writes the pipeline that renders your video, but it can't see or hear the file it just produced — a frozen frame, a burst of dead air, a clipped VO peak, or a caption running off the safe area all read as "exit code 0, done." Wire a /check step so Codex QCs the actual export with UploadCheck before it ever calls the media upload-ready.
broken videos published. Every Codex export 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 Codex — 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 Codex export" — the AI runs UploadCheck and reads back the findings. Free needs no key.
Export your video or audio from Codex, 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 Codex export 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 produce your export in Codex as usual, then run the finished file through UploadCheck — from the web, the CLI, or your AI assistant. UploadCheck scans it for problems Codex can't check, returns timestamped flags and fixes, and you re-check until it passes.
Frozen or black frames, looped/reused footage, dead air and audio dropouts, garbled or unintelligible speech, captions outside the platform-safe area, low-contrast text, loudness off the platform target, and wrong resolution/codec/frame-rate — each with the exact timestamp and a fix.
No. UploadCheck is the last step after your Codex export — one check before you publish. It doesn't touch your Codex project; it inspects the finished file and hands you (or your AI) a repair list.
Does UploadCheck catch problems in AI-generated video Codex stitched into the render? Yes — the deterministic gates flag loop seams and frozen frames (loop_freeze), off-canvas framing (canvas_fill), and audio drifting out of sync (av_sync), while the paid AI oracle gates go further: twins catches cloned or morphed subjects across a scene, garble catches slurred or mangled speech, and the omni_watch and gemini_watch multimodal watchers see and hear the clip to flag the "looks wrong" artifacts — warping, extra fingers, temporal flicker — that no deterministic rule can name, then tell Codex exactly what to fix.
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 export 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.