How many videos can I put on screen at once?

Two to four, side-by-side, top/bottom, or in a 2x2 grid.

What happens to the audio?

You can mix all the clips' audio together or pick a single clip's audio.

Are my videos uploaded to combine them?

No — the split screen is composited entirely in your browser with a self-hosted engine.

Video Split Screen

Combine 2–4 videos side-by-side, top/bottom, or in a 2×2 grid — 100% in your browser

All Video Tools →

M4A to MP3 M4A to WAV M4A to MP4 MP4 to WAV MOV to WAV MP4 to OGG

How do I make a split-screen video in my browser without uploading?

Open AnyTool's Video Split Screen tool, drop in 2 to 4 clips, and combine them side-by-side, top/bottom, or in a 2x2 grid. Mix the audio together or pick one clip's audio, then export an MP4. It runs in your browser with a self-hosted ffmpeg engine: no upload, no CDN, no watermark.

Combine 2-4 videos into one frame
Side-by-side, top/bottom, or 2x2 grid
Mix all audio or pick one source
100% in your browser — no signup, no watermark

What is

Split-screen video

A split-screen video shows two or more clips at once within a single frame — arranged side-by-side, stacked top and bottom, or in a 2x2 grid — with audio either mixed together or taken from one source. Building it client-side composites the clips in the browser, so the files are never uploaded.

Video Tools

Related terms

split screengridside-by-sideaudio mixffmpeg

How to Make a Split-Screen Video

Combine 2-4 clips into one frame in your browser.

1 minWeb browser

1
Add videos
Drop in 2 to 4 clips — they stay on your device.
2
Pick a layout
Choose side-by-side, top/bottom or a 2x2 grid, and set the audio.
3
Export
Composite and download the MP4 — nothing is uploaded.

Result: A split-screen MP4 video

Frequently Asked Questions

Two clips can go side-by-side or stacked, and three or four fit into the grid layout.

Mixing blends every track, while picking one keeps just that clip's sound in the MP4.

The clips never leave your device and there is no signup or watermark (files up to 400 MB).

Detailed Explanation

Methodology

How the Video Split Screen Tool Works

AnyTool builds split-screen videos entirely in the browser using a self-hosted single-threaded ffmpeg.wasm engine — the core (ffmpeg-core.js + the 32 MB wasm) is bundled from npm and served as a same-origin asset, so nothing is fetched from a CDN. Each input clip is first scaled and padded to fit its grid cell, then the cells are combined with the hstack (side-by-side), vstack (stacked), or xstack (grid) filter; audio is mixed with the amix filter over the inputs that carry sound, or you can pick a single track or none. The composite is re-encoded as H.264 video with AAC audio in an MP4. Single-threaded is deliberate: the multi-threaded core needs SharedArrayBuffer + cross-origin isolation (COOP/COEP), which would block cross-origin ad iframes, so it is avoided.

Runs client-side — the videos are never uploaded
Self-hosted ffmpeg core (bundled) — no CDN
Each input scaled + padded to its cell
Combined with hstack / vstack / xstack
Audio amix over sound-carrying inputs, or pick one / none; H.264 + AAC MP4
Single-threaded (keeps ads working); no backend, files up to 400 MB

Privacy & Security

Privacy vs Upload-based Tools

Most online split-screen makers upload your files to a server and cap the free tier or add a watermark. AnyTool composites locally with a bundled engine, so the videos never leave your browser, there is no watermark and no signup (files up to 400 MB), and it works offline after the first load.

Split screen: AnyTool vs typical tools
Capability	AnyTool	Typical tools
Data handling	In your browser	Often uploaded
Engine source	Self-hosted (no CDN)	CDN / server
Layouts	hstack / vstack / xstack	Often fixed
Audio	amix / pick / none	Often first only
Watermark / cap	None	Common
Cost	Free, no signup	Free/limited

AnyTool is a privacy-first client-side split-screen maker — compositing runs locally and nothing is uploaded.