How to make a TikTok
with a blurred background.
The format almost every reposted widescreen clip on TikTok uses — and the specific settings that keep it from getting rejected or throttled.
It's the default for reposted widescreen content
Almost every widescreen clip you see on TikTok — gaming, sports, podcasts, streams — is presented this way. There's a reason: cropping to vertical destroys the frame, and letterboxing with black bars looks lazy and wastes screen.
Blurred fill keeps the full original frame, fills the screen, and reads as intentional. It's become the visual convention for "this was filmed wide, and I'm showing you all of it."
TikTok's requirements
| Setting | Value |
|---|---|
| Resolution | 1080 × 1920 |
| Aspect ratio | 9:16 |
| Codec | H.264 |
| Pixel format | yuv420p (mandatory) |
| Frame rate | Match the source — usually 30 or 60fps |
| Container | MP4 |
Uploading larger than 1080×1920 gains nothing — TikTok downscales on ingest. Uploading smaller looks visibly soft next to native content.
What actually hurts your distribution
Third-party watermarks
Platforms actively deprioritise content that visibly originated elsewhere. A logo from an editing tool in the corner can quietly cap your reach — this is the single most avoidable mistake.
Black bars instead of blur
Letterboxing reads as low-effort and wastes a third of the screen. Blur fill occupies the same space with something that looks deliberate.
Wrong pixel format
yuv444p exports fail to upload entirely on most platforms — the file simply gets rejected with an unhelpful error.
Over-compression
Above CRF 23 the blurred region shows visible blocking on dark scenes, which is exactly where it's most noticeable.
Ready to run
ffmpeg -y -i input.mp4 -filter_complex "\
[0:v]scale=1080:1920:force_original_aspect_ratio=increase,\
crop=1080:1920,boxblur=40:4,setsar=1[bg];\
[0:v]scale=1080:-2[fg];\
[bg][fg]overlay=(W-w)/2:(H-h)/2:format=auto,format=yuv420p[v]" \
-map "[v]" -map 0:a? -c:v libx264 -preset veryfast -crf 20 \
-c:a copy -movflags +faststart output.mp4Common questions
Does a blurred background hurt reach on TikTok?
No. It's a standard, widely-used format. What does hurt reach is a visible third-party watermark, which signals the content was recycled from another app.
What size should a TikTok video be?
1080 × 1920 at 9:16. Larger gets downscaled on upload; smaller looks soft compared to native content.
Why won't my video upload?
Nine times out of ten it's the pixel format. Export with yuv420p — yuv444p is rejected by most social platforms.
Should I add captions on top?
Captions generally help watch time, but keep them inside the central safe area so platform UI doesn't cover them.