Overview
Introduction
An image with no metadata gives a registry, a scanner, or a teammate nothing to go on beyond a tag, no version, no link back to the source repository, no license.
This tool generates the standard OCI org.opencontainers.image.* label set plus any custom labels you want, producing both the Dockerfile LABEL instruction and the equivalent Compose labels: block from the same fields.
What Is Docker OCI Labels Generator?
A generator for the OCI image spec's predefined annotation keys, title, description, version, source, licenses, and authors, plus an open-ended list of custom key/value labels.
It outputs both forms that consume these labels: a Dockerfile LABEL instruction (baked into the image) and a Compose labels: block (attached at the service/container level within a compose project).
How Docker OCI Labels Generator Works
Each filled-in OCI field is mapped to its full org.opencontainers.image.* key and combined with any custom labels into one ordered list, empty fields are simply skipped rather than emitted with a blank value.
The Dockerfile form renders all labels as a single LABEL instruction with line continuations (`\`) for readability, since Docker treats multiple LABEL instructions as extra image layers, one combined instruction is the recommended pattern. The Compose form renders the same key/value pairs as a YAML mapping under labels:.
When To Use Docker OCI Labels Generator
Use it when publishing an image to a registry and you want standard, machine-readable metadata (version, source, license) attached, so downstream tools and teammates can trace the image back to its origin.
It's also useful for attaching organization-specific labels (team ownership, environment, cost center) consistently across many services' Dockerfiles or compose files.
Often used alongside Dockerfile Generator, Docker Compose Generator and Multi-Stage Docker Builder.
Features
Advantages
- Uses the standardized OCI annotation keys, understood by registries, scanners, and SBOM tooling rather than ad hoc custom keys.
- Produces a single combined LABEL instruction, avoiding the extra image layers that separate LABEL lines would otherwise create.
- Covers both the Dockerfile (image-level) and Compose (service-level) label mechanisms from one input set.
Limitations
- Doesn't validate that a source URL is reachable or that a version string matches your actual release, it just formats what you provide.
- Only covers the six most commonly used OCI annotation keys, not the full annotation list (which also includes things like created timestamps and revision hashes); add those as custom labels if needed.
Examples
Best Practices & Notes
Best Practices
- Always set org.opencontainers.image.source so anyone with the image can trace it back to the exact repository that built it.
- Combine labels into a single LABEL instruction (as this tool does) rather than one LABEL per line, to avoid unnecessary extra image layers.
- Keep custom label keys namespaced (e.g. com.acme.team) if they might otherwise collide with another tool's labeling convention.
Developer Notes
Values are escaped for backslashes and double quotes before being wrapped in quotes, since LABEL and Compose labels: both expect quoted string values and an unescaped quote in, say, a description field would otherwise break the generated syntax. The Dockerfile form joins entries with a trailing ` \\` line continuation on every line except the last, matching Docker's documented multi-line LABEL convention.
Docker OCI Labels Generator Use Cases
- Standardizing image metadata across a team's services so registries and scanners have consistent title/version/source/license information
- Attaching organization-specific labels like team ownership or environment to every image build
- Documenting an image's license and authorship for compliance or provenance tracking
Common Mistakes
- Writing one LABEL instruction per field instead of combining them, creating an extra image layer per label for no benefit.
- Forgetting to set org.opencontainers.image.source, the single most useful field for tracing an image back to its origin.
- Using an unescaped double quote inside a description field when hand-writing LABEL lines, breaking the Dockerfile's parsing (this tool escapes it automatically).
Tips
- Set version to match your actual release tag or git tag so the label and the image tag never drift apart.
- Add this LABEL block near the top of a Dockerfile generated by the Dockerfile Generator or Multi-Stage Docker Builder tools.