Wan Video Upload Failed? Input Video Specs for Extension and Editing
Wan accepts MP4 or MOV clips up to 100MB with each side between 240 and 4096px. Prepare clips at 2–10 seconds and they work across current Wan versions. Here is how to avoid rejected uploads and mismatched results.
Why won't Wan accept my video?
Wan can take an existing video and extend it, edit what is in it while following its motion, or use it as a reference for a new shot. Its input rules are generous compared with most platforms, but they differ slightly between Wan versions, which is where many failed uploads come from.
Some limits are the same across current versions: MP4 or MOV, up to 100MB per clip, each side between 240 and 4096 pixels, and a very wide range of aspect ratios. Length is where versions differ, so preparing clips at 2 to 10 seconds is the safest choice that works everywhere.
Wan input video limits (all current versions)
MP4 or MOV, up to 100MB per clip, width and height each 240–4096px, aspect ratio up to 8:1. A clip of 2 to 10 seconds is accepted by every current Wan version. Output is up to 1080p.
Why 2 to 10 seconds is the safe length
Newer Wan versions accept longer clips and several clips at once, while earlier versions take a single clip of 2 to 10 seconds. If you are not sure which version you are using, or you switch between them, keep each clip between 2 and 10 seconds. It will be accepted everywhere, and you avoid a clip that works in one version being refused in another.
Plan the total length when extending a video
When Wan extends a video, there is a ceiling on how long the final result can be, and your original clip counts toward it. Depending on the version, the limit for your clip plus the new footage is 15 or 30 seconds. Decide how much new footage you need, add the length of your clip, and check that the total fits before you generate. Whole-second clips make this arithmetic easy.
Check the audio setting to keep your sound
Wan versions handle sound differently. Some let the model decide whether to keep your audio or generate new sound based on the prompt, and some simply include or remove an audio track. If your clip has dialogue or sync sound you need to keep, check the audio option before generating rather than assuming your original sound will be preserved.
4K and wide framing are accepted
Each side can be up to 4096 pixels, so UHD 4K (3840×2160) is accepted, and aspect ratios up to 8:1 cover cinemascope, vertical and panoramic crops. Output is at most 1080p, and the frame size may be adjusted slightly, so plan to conform the result in your editor if you need the exact original size. Scaling 4K to 1080p before upload also keeps the file safely under 100MB.
Common reasons Wan 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 Wan
Select Wan in FixMyVideoForAI and drop in your clip. The tool checks length, file size, resolution, frame rate and codec and shows exactly which items fail.
Converting trims the clip to 2–10 seconds at a whole number of seconds, re-encodes it to MP4 (H.264) at a constant frame rate and scales oversized footage down to 1080p to stay well under 100MB. Your original audio track is kept in the file. Everything runs inside your browser, so your footage never leaves your computer.
Convert to Compliant Video Now (Wan)
Safely convert in your browser to MP4 + H.264 + CFR without software installation.
Frequently Asked Questions
Wan versions accept different lengths. Newer versions take longer clips, earlier ones stop at 10 seconds. Trim to 10 seconds or less and it works in all of them.