Does it connect to my cluster?

No. The manifest is parsed and checked locally in your browser — nothing is sent to a cluster or server.

Can it validate CRDs?

Structural checks apply to any resource, but unknown kinds are only flagged as informational since custom resources are valid.

Are multi-document files supported?

Yes. Separate documents with --- and each one is reported with its own document number.

Is this a replacement for kubectl --dry-run?

No. It catches common structural and best-practice issues early; the API server remains the source of truth for full schema validation.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Kubernetes YAML Validator

Validate Kubernetes manifests and catch risky container settings.

Support

Works Offline

Privacy First

No Login

No API

Kubernetes manifest

Paste one or more YAML documents separated by ---

Validation results

Schema basics plus best-practice checks

Documents

Errors

Warnings

doc 1 No `metadata.labels` — labels make selecting and grouping resources much easier.
doc 1 `spec['selector']` is required for Deployments and StatefulSets.
doc 1 Container `web` uses an unpinned/latest image tag — pin an explicit version.
doc 1 Container `web` has no `resources` requests/limits.
doc 1 Container `web` has no `livenessProbe`.
doc 1 Container `web` has no `readinessProbe`.
doc 1 Container `web` has no `securityContext` — consider runAsNonRoot and dropping capabilities.

About the Kubernetes YAML Validator

Paste one or more Kubernetes YAML documents separated by --- to check the required apiVersion, kind and metadata fields, RFC 1123 name rules, missing selectors on Deployments and StatefulSets, removed API versions, unpinned or :latest images, missing resource requests and limits, absent liveness and readiness probes, and privileged or missing securityContext.

Popular uses

kubernetes yaml validator
k8s manifest linter
kubectl validate
deployment yaml checker
k8s best practices

Examples

Unpinned image

YAMLimage: nginx:latest

Output

YAMLWarning: unpinned/latest image tag

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-19 · Runs entirely in your browser