Vercel Sandbox now support Custom Images
By Steven Van ·
The public beta lets a sandbox boot from any image pushed to Vercel Container Registry instead of a managed image.
Vercel Sandbox can now boot from a custom root filesystem instead of only its managed images. Custom images are in public beta as of 30 June 2026, pulled from Vercel Container Registry, so any image pushed with docker push is available to a sandbox immediately.
The point is to bring an existing OS, toolchain and dependencies into a sandbox without spinning up compute to create a Snapshot first. Custom images still boot from a precompiled snapshot in the same format as Sandbox Snapshots, so cold start performance isn't affected.
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