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Skopeo

Inspect, copy and sign container images without pulling them

Overview

What Skopeo does

Skopeo performs operations on container images and registries without requiring a daemon and without pulling images to local storage. It can inspect a remote image’s metadata and layers, copy images between registries, delete them, and sign them. The practical value is bandwidth and pipeline simplicity. Checking what is inside an image, or promoting a build from a staging registry to production, normally means pulling it down and pushing it back up. Skopeo copies registry to registry directly, and inspects without downloading at all.

What people use it for

  • Promoting images between staging and production registries without a round trip
  • Inspecting an image’s contents before deciding to deploy it
  • Mirroring images into an air-gapped or internal registry

The honest half

Where it falls short

Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about Skopeo.

  • Single-purpose: it neither builds nor runs images, so it is one tool in a chain rather than a solution
  • Command syntax with transport prefixes such as docker:// is unusual and trips people up initially
  • Documentation is sparse compared with the rest of the container ecosystem

Cross-shopped

What people choose instead of Skopeo

Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.

  • Skopeo logo
    Skopeo
    vs
    Podman logo
    Podman

    Podman: From the same project, and the runtime that actually executes the images Skopeo moves

Pricing

What Skopeo costs

Taken from the vendor's own pricing page. Prices move, so check before you buy.

Skopeo

Free

  • Full functionality
  • No usage limits
  • Community support

Capabilities

Features

  • Remote inspection

    Read image metadata and layer digests without downloading

  • Registry-to-registry copy

    Move images directly between registries without a local pull

  • Format conversion

    Convert between OCI and Docker image formats during copy

  • Image signing

    Sign and verify images as part of a supply chain process

Answered, with sources

Questions people ask

Each answer names the page it came from, so you can check it rather than take our word for it.

Is Skopeo free?

Yes, open source with no licence fee.

Why copy images without pulling them?

A registry-to-registry copy avoids downloading and re-uploading gigabytes, which is faster and much cheaper on bandwidth in CI.

Can Skopeo run containers?

No. It only inspects, copies, signs and deletes images. Running them is Podman’s or Docker’s job.

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Softwr does not host reviews and shows no star rating for Skopeo, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.

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