Draw precise masks, animate them across time, and isolate your subject—without uploading footage. Export editable matte or transparency sequences for your next creative project.
Everything stays in your browser. Manual precision, frame by frame.
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Start with a video or still image.
Drag your media here or choose a file. Then trace your subject and animate the mask along the timeline.
Common browser-playable MP4 / WebM / MOV, PNG, JPG, WebP · up to 2 GiB · local only
How it works
01 Trace a person or object with polygon, rectangle or ellipse tools.
02 Move to a new frame and adjust the shape; keyframes interpolate automatically.
03 Refine feather and edge expansion, then export PNG mattes or transparency sequences.
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PREVIEW
Click to draw a maskX: — Y: —Only changes preview, not project or export.
00:00.0000:06.00
KeyframesSelect a mask
Manual mask interpolation, not automatic AI subject tracking. Changes at a new time create a keyframe. Source audio is not included in PNG exports.
BUILT FOR FRAME-BY-FRAME WORK
Intuitive rotoscoping, precise results.
Draw around a moving subject on one frame, adjust its shape a few frames later, and preview the interpolation in between. Build additive and subtractive masks, refine their edges, and export transparent PNGs for your editing workflow.
01
Trace with control
Freeform polygon, rectangle and ellipse tools with editable vertices and independent layers.
02
Animate without guesswork
Every geometry change at a new point in time creates a keyframe. Choose linear, eased or hold interpolation.
03
Deliver usable mattes
Export current-frame PNGs or ZIP image sequences with alpha and a timing manifest.
Frequently asked questions
Does this automatically cut out a person?
No. This version provides manual rotoscoping and keyframe interpolation, not neural subject segmentation or automatic motion tracking. You trace and refine shapes yourself.
Can I export a transparent video?
Export the RGBA PNG sequence and import it into a compatible editor as an image sequence. A single transparent video container is not provided because browser-native video encoders cannot reliably preserve alpha across browsers.
Is my video uploaded?
No. Video/image imports, editing and exports are performed locally in your browser. Project JSON only contains mask data and source-file metadata, not your original media.
How much video can I export?
For predictable browser memory usage, one ZIP is limited to 180 sampled frames and approximately 320 MB. Choose a shorter section or a lower sampling rate for longer clips.
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Using Rotoscoping & Masking Studio
Create manual geometric masks for stills or sampled video by drawing shapes and keyframing their position and size. Refine visible/subtract layers over time and export still mattes or a timed image sequence.
Open a video, still image or generated practice scene and add a polygon, ellipse or rectangle mask layer.
Set mask points at chosen times, review the interpolated frames, then refine layer shifts, feathering, expansion and visible/subtract behavior.
Export an RGBA still or grayscale matte, a bounded timed PNG ZIP, or a versioned JSON project for continued editing.
Example: Mask a moving foreground object with a polygon at three key times, review the interpolated shape between keys, and export a short grayscale PNG sequence for compositing in another editor.
Limits and privacy: Masking is manual; the tool does not automatically segment or track a subject, and it does not export alpha video or audio. Solo is preview-only, while output uses visible layers. Processing is capped at 180 sampled frames and 120 million rendered pixels; PNG ZIP output is limited to 320 MiB. Requested timestamps are not verified source PTS, and sampled hashes do not prove full-file identity.
