AE2CSS

Install AE2CSS

One file, about a minute. macOS + After Effects. Pick a method below, then open the panel from After Effects' Extensions menu.

Download for macOS (.pkg) Free during alpha · Adobe After Effects required

macOS flags installers from outside the App Store. AE2CSS is safe — it's simply unsigned during alpha, so the system can't auto-verify it yet. Both methods below open it anyway. Signed & notarized installs are coming.

Terminal

Fastest

One command downloads and launches the installer — no separate download, no security flag to clear. Just paste.

  1. Open Terminal — press ⌘ Space, type Terminal, hit Enter.
  2. Paste this and press Enter:
    curl -fsSL https://ae2css.com/downloads/AE2CSSExporter-macOS.pkg -o ~/Downloads/AE2CSSExporter.pkg && open ~/Downloads/AE2CSSExporter.pkg
  3. Follow the installer, then restart After Effects.

Without Terminal

Approve the installer once in System Settings, then run it normally.

  1. Download, then double-click the .pkg in Downloads.
  2. macOS shows "Apple could not verify…" — click Done.
  3. Open System Settings → Privacy & Security, scroll to Security, click Open Anyway next to AE2CSS, confirm with Touch ID or password.
  4. Double-click the .pkg again → it installs. Restart After Effects.

After installing

Open After Effects → Window → Extensions → AE2CSS. Select a composition, click Analyze to preview, then Export. Updates arrive inside the panel — no reinstall.

Download for macOS (.pkg) Trouble installing? Contact support