Marketing Video Creator: Browser-Based Video Editor Source Code (Split, Insert & Text Overlay)

Marketers and creators rarely need a full video suite. They need to do three things quickly: cut a long recording into short clips, insert an intro or b-roll at the right moment, and add text such as a headline, captions or a call to action. Desktop editors are heavy, and online editors make you upload every file and pay a subscription.

Marketing Video Creator does those three jobs entirely in the web browser. Processing runs on the user's own machine with an in-browser build of FFmpeg (WebAssembly), so footage never leaves the device, original quality is preserved, and there are no server-side rendering costs for whoever hosts it. That makes it a strong base for a freemium SaaS, a white-label tool, or a lead magnet for a marketing agency.

Three tools

1. Split Video (video splitter)

• Upload a video and mark cut points on a frame-thumbnail timeline
• Export every segment as its own file: 3 cut points produce 4 clips
• Frame-exact cuts, because each segment is re-encoded
• Useful for chopping a webinar, podcast or product demo into short-form clips for social media

2. Insert Videos (merge and insert clips)

• Mark insert positions in a base video and attach a clip to each one
• Replace or remove inserted clips at any time
• Inserted footage of any resolution is automatically scaled and center-cropped to match the base video
• Export one combined video, with branded intros, b-roll and testimonials stitched in

3. Decor Video (text overlays and captions)

• Add any number of burned-in text overlays
• Full styling: font family, size, bold, italic and color
• Drag text anywhere on the live preview
• An optional dark or light readability scrim keeps text legible over bright footage
• Precise per-overlay on-screen timing
• Unicode text support, so it can caption and subtitle in other languages (e.g. Vietnamese)

Editor features

• A dashboard with recent projects, showing each project's type, file, duration and overlay or insert count
• A timeline with frame thumbnails, a scrubbable playhead and playback controls
• A live preview that matches the export exactly: same fonts, colors, positions and timing
• Autosave in the browser via IndexedDB, so users can close the tab and resume later
• Export as MP4 or MOV at Original, High or Medium quality
• Save exports to a real folder via the file picker, in supported browsers
• Works with vertical (9:16, e.g. 720×1280) and horizontal video
• No accounts, no uploads and nothing to install

Example workflow

A social media manager records a 15-minute product demo. With Split Video they cut it into four standalone clips. With Insert Videos they drop a branded intro at the start of each one. With Decor Video they add a headline and a call-to-action caption, each with a dark scrim, timed to appear only at the right moments. A few minutes later, without uploading a single file, they have a week of on-brand, ready-to-publish marketing videos.

Who it is for

• SaaS builders: launch a freemium online video editor with near-zero infrastructure cost.
• Marketing agencies: offer a white-label clip-and-caption tool to clients, or use it as a lead magnet.
• Creator-economy platforms: embed quick editing for short-form content.
• Privacy-sensitive teams (legal, healthcare, enterprise) that can't upload footage to third-party editors.
• Developers who want a working reference for FFmpeg.wasm video processing in React.

Technology

React · TypeScript · Vite · Zustand (state) · IndexedDB (local project storage) · FFmpeg compiled to WebAssembly · CSS

What you get

• Complete front-end source code
• All three tools: Split, Insert and Decor
• 30 days of seller support
• Optional annual maintenance: $50/year

Good to know

• Performance depends on the user's device. Because processing happens in the browser, long or high-resolution videos take longer on slower computers.
• Folder saving is browser-dependent. Choosing a save folder uses the File System Access API (Chromium browsers). Other browsers fall back to a standard download.