Kling Video Upload Failed? Kling Omni Video Reference & Editing Specs
Kling Omni rejects videos outside 3–10 seconds, 720–2160px, 24–60 FPS or over 200MB. See why 4K and slow-motion clips fail and how to fix them in your browser.
Why won't Kling accept my video?
Kling's Omni models (VIDEO O1 and VIDEO 3.0 Omni) let you upload one existing video and either edit it with a text prompt or use it as a motion and camera reference for a new generation. Kling is stricter about that input video than most platforms, and a clip that plays perfectly on your phone or in your editor can still be refused.
Most rejections come from four hard limits: duration, the size of each side of the frame, frame rate, and file size. Unlike platforms that quietly downscale, Kling checks these before it accepts the upload, so it is worth knowing the exact numbers before you export.
Kling Omni input video limits
One video per generation, 3 to 10 seconds long, 2K resolution or below (Kling's API documentation sets 720px as the minimum and 2160px as the maximum for each side), 24 to 60 FPS, MP4 or MOV, up to 200MB.
Why 4K footage is rejected even though it looks like "2K or less"
Kling's limit is about each side of the frame, not the total quality label. A UHD 4K clip is 3840×2160. Its height is fine, but its width of 3840px is far over the 2160px maximum, so the upload fails. Vertical 4K (2160×3840) fails for the same reason on the height. Scaling the long side down to 1920px (1080p) keeps the clip inside the limit with plenty of detail for Kling, which renders its own output at 720p or 1080p anyway.
Slow motion and high frame rate clips
iPhones and Galaxy phones record slow motion at 120 or 240 FPS, and many action cameras default to 100 or 120 FPS. Kling only accepts 24 to 60 FPS. Converting to a constant 30 FPS (or 24 FPS for a film look) solves this. If you want the slow-motion feel, conform the footage to slow motion in your editor first, then export at 24 or 30 FPS.
Your original audio is not carried into the result
When a video is used as input, Kling does not generate native audio and does not pass your clip's sound through to the result. Plan to add dialogue, music or sound effects back in your editor after generation. Removing the audio track before upload also makes the file smaller.
Trimming to an exact length for editing work
Kling's window is 3.0 to about 10 seconds. A 10.4-second clip will be refused, and a 2.9-second clip will too. If you plan to cut the generated result back into your timeline, trim your input to a whole number of seconds (for example exactly 5 or 8 seconds) so you know precisely how long the generated shot should be and can line it up with the original frame-for-frame.
Common reasons Kling rejects a video
AI video encoders require strict video specifications in browser and cloud AI server environments. Upload errors typically occur due to the reasons below.
Preparing a video for Kling
Select Kling in FixMyVideoForAI and drop in your clip. The tool checks duration, resolution, frame rate, codec and file size against Kling's limits and shows exactly which ones fail.
One click converts the clip to MP4 (H.264) at a constant frame rate, scales oversized footage down to 2K or below, trims to your chosen whole-second length and keeps the file well under 200MB. Everything runs inside your browser, so unreleased footage never leaves your computer.
Convert to Compliant Video Now (Kling Omni)
Safely convert in your browser to MP4 + H.264 + CFR without software installation.
Frequently Asked Questions
Kling limits each side of the frame to 2160px. UHD 4K is 3840px wide, so it fails regardless of file size. Scale it to 1920×1080 first.