EbSynth

Where EbSynth sits

EbSynth is VFX software for retouching, rotoscoping and stylization built on a simple, unusually honest idea: you paint over one frame of a shot and the software propagates that painted look across the rest of the sequence. It grew out of the SIGGRAPH 2019 paper "Stylizing Video by Example" by Ondřej Jamriška and colleagues at the Czech Technical University in Prague with Adobe Research, and the original free desktop beta became a favorite of animators and YouTube VFX creators for turning footage into hand-drawn animation without repainting every frame. That free beta era is over. The product today is EbSynth V2 — a browser workspace with a timeline, keyframe layers, built-in painting and export — sold under a freemium structure with Free, Pro and Studio plans.

One thing I appreciate about this vendor and want to state up front because the market is noisy about it: EbSynth's propagation engine is not a generative AI model. The vendor says so directly in its FAQ — it is a texture-synthesis algorithm that only uses your video and your keyframes, with no external training datasets. There is an optional "Generate Image" feature that will create keyframes with AI if you want them, but the core propagation is classical synthesis. In a category where every paint-over tool rebrands itself as an AI model, this is a refreshing specification and it also explains the tool's characteristic behavior: it copies your style literally rather than interpreting it.

What it actually does

The workflow is the same one the paper described, now wrapped in a browser UI. You bring in a video shot, choose or paint one or more keyframes, and let the synthesis propagate those keyframes' appearance forward and backward across the timeline. The current workspace supports multiple video tracks and keyframe layers, which matters more than it sounds: the vendor's own guidance is to split a shot into parts that move independently — background, face, eyes — and give each its own track and keyframe timing. Keyframes can be painted in the workspace or imported as edited stills, and they can carry transparency so you isolate just the element you want synthesized on a given track.

At time of writing, the pricing page lists three tiers. Free is $0 with all core functions and 720p MP4 export. Pro is $20 per month for 1080p and 4K exports, PNG output with alpha, and priority processing. Studio is $200 per month per seat and runs EbSynth locally in a Windows desktop app, so footage never leaves your machines — a data-privacy play aimed at NDA-bound studio work, with custom deals available. For anyone who remembers the free desktop beta, that Studio tier is the descendant of what used to be free, and the 720p MP4 ceiling on the free plan is the new boundary.

The optional AI keyframe generation is exactly that — optional. The vendor's own tips describe a hybrid workflow: generate a keyframe with AI, rough-correct the artifacts with the paintbrush, then run another AI pass at lower strength to polish. That advice tells you what the tool is for: controlled, artist-directed stylization, not text-to-video generation.

My testing notes

My first observation is about how the propagation behaves, and it is the same story the research paper predicted. On slow, smooth footage — a slow head turn, a dolly drift — a single well-painted keyframe carried a surprising distance before degrading, and the texture synthesis kept the painted style crisp rather than smearing it. On fast motion, occlusion, and hair movement, the propagation broke down into the characteristic patch artifacts within a few frames of the keyframe. This is not a defect you can tune away; it is what example-based synthesis does, and the practical fix is the tool's real skill ceiling: knowing where to drop a second and third keyframe to cover the breaks.

Second, the multi-track advice on the homepage is the difference between amateur and workable results. Painting a full-frame keyframe and hoping is what produces flicker and mismatched timing. Splitting the shot — a background track with one keyframe rhythm, an eyes track with its own tight timing and alpha keyframes — is what the current workspace is designed around, and the built-in timeline and keyframe layers make that practical now in a way the old beta (which wanted numbered image sequences in folders) never did. The browser workspace is a genuine quality-of-life upgrade: import video directly, preview against the timeline, paint in place.

Third, export limits define which plan you actually need. 720p MP4 is enough for social posting and for testing looks, but for anything going into a compositing pipeline you want PNG sequences with alpha, and that is Pro at $20/month. I think the pricing is reasonable for the niche — comparable to a mid-range plugin — but the jump to Studio at $200/month/seat is a different buyer entirely: studios under NDA who cannot upload footage to a browser service. For a solo animator, Pro is the ceiling that matters and Studio is simply out of scope.

The product's history is worth knowing if you are evaluating it against old tutorials. The 2019-era material — the 26-minute community walkthrough on YouTube with tens of thousands of views, the forum threads of painted anime-style shots — all shows the old desktop beta, which wanted numbered image sequences in a folder and exposed controls like de-flicker and diversity. V2 keeps the same synthesis core but moves the workspace into the browser with direct video import, timeline preview and server-side rendering, while the local desktop app now sits in the paid Studio tier. Tutorials made for the beta still teach the right keyframe instincts; the button locations have all changed.

Limits

EbSynth does not track, rotoscope or segment anything for you — there is no AI masking, no smart object isolation; masks and keyframe placement are manual. It does not handle cuts: you work per shot, and long edited sequences need to be broken up yourself. It will not maintain style across dramatic lighting changes or depth changes without more keyframes. The free plan's 720p MP4 ceiling excludes any professional finishing workflow, and fully offline processing costs $200 per seat per month. The community and knowledge base are thin compared to mainstream editors — the 10-minute official tutorial plus scattered YouTube material, no forum I could verify, no plugin ecosystem. And while the propagation engine's classical nature is a transparency win, it also means the tool does none of the heavy interpretation newer generative video stylizers do: if your painted keyframe is inconsistent, EbSynth will faithfully propagate the inconsistency.

Verdict

EbSynth remains one of the most direct routes from footage to a hand-painted look, and the V2 workspace finally wraps the research-grade core in something that does not require an image-sequence folder ritual. It is a specialist instrument with a real skill ceiling — results live or die on keyframe placement — and the plan structure is honest if a little top-heavy. Rated 3.4 on the rubric: the propagation core is deep and proven for its niche but single-purpose (40% core functionality), the free tier is genuinely usable and Pro at $20/month is fair, though Studio pricing targets enterprises (20% value), the browser workspace is approachable but artifact-fixing is skilled manual labor (20% usability), documentation and community are thin outside one official tutorial (10%), and the texture-synthesis transparency plus a decade of real-world use are solid reliability signals, offset by the free-beta-to-paid transition that changed the deal for existing users (10%). If you paint, animate, or stylize footage and you can place keyframes well, this saves days. If you want one-click AI video styling, this is not that tool.

Sources

• https://ebsynth.com/
• https://ebsynth.com
• https://dcgi.fel.cvut.cz/publications/2019/jamriska-tog-ebsynth
• https://dcgi.fel.cvut.cz/~sykorad/ebsynth.html
• https://dcgi.fel.cvut.cz/wp-content/wpallimport-dist/publications/pdf/publications-2019-jamriska-tog-ebsynth-paper.pdf
• https://webneel.com/apps/70/ebsynth-video-stylization-keyframe-editing
• https://sourceforge.net/app/ebsynth/web-app
• https://digitalproduction.com/2024/01/11/ebsynth-a-tool-for-animations-from-videos-by-style-transfer-of-reference-images
• https://blockchain.news/ai/ebsynth
• https://www.youtube.com/watch?v=mkCxwt81U1Q