Humanize a clipright here.
No login. No upload. Drop a short AI-generated clip and re-encode it in your browser with ffmpeg — one free clip to try.
Humanizer controls
Keep the adjustments subtle. This panel only exposes the browser-safe v1 defaults that already exist in the repo.
Video detectors lookbetween the frames.
They analyse temporal coherence, codec parameters, container provenance and per-frame noise. The video pipeline works on the geometry, colour, codec and container layers — it does not touch the temporal or per-frame noise signals, which is worth knowing before you rely on it.
Per-frame noise consistency, block artefacts, chroma analysis. Not addressed by this pipeline.
Optical-flow stability, motion-vector patterns, jitter profile. Not addressed by this pipeline.
Codec parameters, container tags, frame-level provenance. This is the layer the pipeline works on.
Six pillars,one undetectable clip.
Every layer is calibrated against a specific video-detector signal. Together they rebuild the full statistical signature of authentic camcorder footage.
Geometry Rewrite
Optional flip, sub-degree rotation, zoom and an off-grid crop. Generator output tends to land on standard dimensions; the export does not.
Colour Grading Pass
Brightness, contrast, saturation and colour-balance presets — soft, fade, warm, cool or contrast — applied at a strength you choose.
Codec & Container Rewrite
Full re-encode through ffmpeg.wasm with new codec parameters and 4:2:0 chroma output, plus a micro-trim at the head and tail of the clip.
Container Metadata Replacement
Source container tags are dropped. Optionally replaced with an Apple, Samsung or Pixel handheld persona and a backdated creation time. Pixel-embedded watermarks such as SynthID are not targeted on video.
Preflight Validation
Codec, duration and size are checked before any work starts, so an unsupported clip fails fast instead of halfway through an encode.
Browser-Only Processing
Video processing runs on your device with ffmpeg.wasm. File content is not uploaded; account and quota metadata may still be recorded.
Frame in,authentic clip out.
The pipeline runs in deterministic order inside a worker with ffmpeg.wasm. Seven passes are visible in the public spec; further refinement stages stay reserved.
- 01Preflight validation (codec, duration, size)
- 02Container & metadata strip
- 03Decode and downscale (ffmpeg.wasm)
- 04Optional flip, rotate and zoom
- 05Off-grid crop
- 06Colour grading preset
- 07Micro-trim, head and tail
- 08Chroma 4:2:0 outputreserved
- 09H.264 re-encodereserved
- 10Container metadata rebuildreserved
What flipsunder the hood.
Each row is a signal that video-detector engines weight in their final verdict. After processing, every one reads as natural footage.
| Signal | AI video | After Video Humanizer |
|---|---|---|
| Output dimensions | Generator-standard | Cropped off-grid |
| Codec parameters | Source encoder | Re-encoded, 4:2:0 |
| Colour profile | Model default | Graded to preset |
| Clip boundaries | Exact generator length | Micro-trimmed |
| Container metadata | AI-tool fingerprint | Removed or handheld persona |
| Pixel watermarks (SynthID) | Present | Not targeted on video |
A codec ladderno AI tool replicates.
Real cameras encode with messy, hardware-specific bitrate ladders, GOP cadences and B-frame patterns. Diffusion video tools usually fall back to a clean, single-pass encode — a giveaway forensic tools weight heavily.
Video Humanizer re-encodes with a profile-matched ladder, varied GOP length and realistic B-frame distribution, then rebuilds the container metadata to align with a real recording device — making the whole stack read as authentic capture.
Read about C2PA & video provenance
Three steps,no friction.
No installs. No API keys. No upload waits. Open the tool, drop a clip, get a clean export.
Drop video
Drag any AI-generated MP4, MOV or WebM clip. Sources up to 4K, clips up to 30 seconds.
Local processing
ffmpeg.wasm decodes, filters and re-encodes on your device. Typical: 1–2× clip duration on a modern laptop.
Export
Download a re-encoded MP4 with new codec parameters and rebuilt container metadata.
Works with everymajor AI video tool.
Container tags replaced, geometry and codec rewritten. Any visible on-screen logo needs a separate crop.
Re-encode with new codec parameters and colour grading.
Geometry and colour pass, container metadata rebuilt.
Re-encode and metadata replacement.
Container provenance not carried over. Google's pixel-level SynthID is not addressed on the video path.
Geometry, colour and container rewrite.
Avoid AI-content auto-labels.
1080p-class MP4 with rebuilt container metadata.
Vertical crop and re-encode. Use YouTube's synthetic-content disclosure when it applies.
Size and codec tuned for in-timeline playback.
Your videosnever leave your device.
We built Video Humanizer browser-only on purpose. No upload buckets, no temp storage on a server, no ML training silently happening on your footage.
Frames stay in browser memory and ffmpeg.wasm buffers; video content is not uploaded for processing.
Processing runs in a sandboxed worker thread, off the main UI.
The local processing workflow does not send video content to a training dataset.
Nothing persists. Refresh and it's gone.
Related tools
Adjust pixel signals, inject PRNU, rebuild camera-style EXIF.
Raise burstiness and perplexity while preserving meaning.
What SynthID and C2PA are, and how a local re-encode affects them.
Free verification — scores any image 0–100 confidence.
Strip GPS, camera and timestamp data from any photo — free.
Questions,answered.
Is this legal?
Laws and platform rules vary by jurisdiction and use case. Only process content you are entitled to use, preserve required disclosures and follow the current rules of the platform where you publish. SynthGuard does not provide legal advice.
Will my video quality degrade?
Any re-encode costs a little quality. The defaults keep the geometry, colour and codec changes subtle, but inspect the export at full size and keep the source if fidelity matters.
Does it guarantee a pass on AI video detectors?
No. The tool changes geometry, colour, codec and container characteristics, but commercial and platform detectors are private and change over time. Test the specific export in the workflow that matters to you and keep required AI disclosures.
What's the maximum video length?
Clips up to 30 seconds are supported on the paid plans. Sources up to 4K are accepted and automatically downscaled to a stable 1080p-class export. Each clip costs 2 credits.
Is anything uploaded to a server?
Video file content and frames are processed locally with ffmpeg.wasm and are not uploaded for processing. The app may contact its backend for authentication, quota and operational metadata, without sending the video content.
What file formats are supported?
Input: MP4 (H.264 / H.265), MOV, WebM. Output: high-quality MP4 (H.264) with rebuilt container metadata. Audio is preserved when present.
Can I use it on my phone?
Yes. The pipeline runs on iOS Safari 16.4+ and recent Chrome Android. Performance is roughly half of desktop — expect 2–3× clip duration on mobile.
How is this different from re-encoding the file myself?
Mostly convenience and consistency: an off-grid crop, a colour pass, a micro-trim, new codec parameters and a rebuilt container in one browser-side step, with preflight validation so an unsupported clip fails fast. If you are comfortable driving ffmpeg yourself you can reproduce the same transformations.
Stop gettingflagged.
Open Video Humanizer in your browser. Drop one clip. See for yourself.