Free local Full SBS video tool

Full SBS 3D metadata converter

Check, add, or remove YouTube 3D recognition flags and Full SBS display-shape metadata (SAR/aspect) in MP4, MOV, M4V, and StereoLift MKV files. Your video stays in the browser.

YouTube 3D recognition

Control whether YouTube and 3D-aware players see the upload as a 3D video. The side-by-side pixels stay unchanged while recognition metadata such as st3d, sv3d, or StereoMode is edited. When adding metadata, choose Parallel (Left → Right) or Cross-view (Right → Left) to match the existing video; this does not swap pixels.

3D display shape

Control how some 3D displays present a Full SBS file. SAR means sample aspect ratio: the pixel shape a player should use. pasp is the MP4 field that stores it; MKV uses similar display-size fields.

Set both states

Use one step to ensure both YouTube 3D recognition and display-shape metadata are present, or ensure both metadata families are removed from the output file.

Local Full SBS metadata editing

The interactive converter loads in the browser application. MP4, MOV, M4V, and StereoLift MKV files stay on the device and use a device-aware local memory limit. Supported desktop browsers on HTTPS or localhost can use large-file mode to stream a new output file directly to disk instead of building an in-memory download.

This tool edits MP4-family metadata and StereoLift MKV metadata for existing side-by-side 3D videos. The source video is parsed and rewritten on this device; no video bytes are uploaded to StereoLift servers for this metadata workflow.

Open metadata tools Open playback guide

What changes in the file

YouTube 3D recognition: Recognition metadata such as st3d, sv3d, and Matroska StereoMode controls whether 3D-aware platforms recognize left-right SBS video as 3D.
Display shape metadata (SAR/aspect): This metadata tells some 3D displays how to present the doubled Full SBS frame. SAR means sample aspect ratio, and pasp is the MP4 field that stores that pixel-shape value.
Plain SBS output: Removing 3D and SAR metadata keeps the actual side-by-side pixels but makes the file behave like a conventional wide video.
Large local files: For files at or above 2 GB, Chrome and Edge require secure browser contexts and local file-system save support.

Exact metadata support by container

MP4, MOV, M4V - 3D flags: Adds the selected left-first or right-first 3D recognition flag (st3d). When removing, it clears st3d, sv3d, stereo metadata markers, and known StereoLift frame-packing flags inside the video stream.
MP4, MOV, M4V - display shape: Sets the display-shape metadata many 3D displays use for Full SBS playback. In MP4 this includes pasp, the pixel-shape field, and the half-width tkhd display size.
StereoLift MKV - 3D flags: Switches the Matroska StereoMode setting and clears known StereoLift frame-packing flags inside the video stream where present.
StereoLift MKV - display shape: Updates the existing display-shape fields StereoLift writes into MKV files, including DisplayWidth and DisplayHeight. MKVs without writable fields are rejected.

How do I stop YouTube from recognizing my SBS video as 3D?

Load the Full SBS file, wait for the local analyzer, then use Remove 3D Metadata or Remove Both Metadata. The side-by-side pixels stay unchanged; only the metadata that tells YouTube to treat the upload as stereoscopic 3D is removed.

How do I make a Full SBS video play as regular side-by-side video?

Use Remove Both Metadata when the file has both metadata families. The result keeps the full-width side-by-side image and its existing eye order, but regular players and platforms see a conventional wide video instead of a flagged 3D asset.

What do SAR and pasp mean?

SAR means sample aspect ratio: a small metadata value that tells a player whether video pixels should be shown wider or narrower than they are stored. pasp is the MP4 field that stores that pixel-shape value. StereoLift uses this for Full SBS display shape; you do not need to choose the exact field manually.

Does the local converter support MKV?

It supports StereoLift MKV outputs that contain writable Matroska StereoMode and display-size metadata. It does not promise arbitrary third-party MKV remuxing; unsupported MKV layouts fail before conversion with a user-facing error.

Private browser-local workflow

The source video is parsed in the browser on your device.
No video bytes are uploaded to StereoLift servers for this metadata tool.
Small files are rewritten in browser memory; supported desktop browsers can stream larger files directly to a new local file.
Large-file mode requires HTTPS or localhost because browser file-system saving is only exposed in secure contexts.

When the tool rejects a file

Fragmented MP4/CMAF, DRM-protected media, and files with multiple video tracks are rejected before conversion.
Desktop files at or above 2 GB need Chrome or Edge with local file-system save support.
StereoLift MKV editing requires existing writable display-shape fields such as StereoMode, DisplayWidth, and DisplayHeight.
This tool edits metadata only; it does not create depth maps or convert 2D footage into 3D.

Continue with the right 3D video workflow

Metadata editing is useful when the video is already Full SBS. Use the conversion pipeline when you need StereoLift to create the 3D video from a normal 2D source.

Convert 2D video to Full SBS 3D Read the converter guide Check playback support View pricing examples