YAML Merger
Merge two different YAML into one using this free online YAML merger with various advanced options.
Merge two YAML files into one with configurable merge strategies. Simplify combining Kubernetes manifests, Helm values, and multi-environment configs.
YAML Merger
Merge two different YAML into one using this free online YAML merger with various advanced options.
About this tool
Merge two YAML files into one with configurable merge strategies. Simplify combining Kubernetes manifests, Helm values, and multi-environment configs.
FAQ
Common questions and answers about this topic.
What does this tool do?
Merges two or more YAML documents into one, combining mappings from all sources with configurable conflict and array strategies.
Can I merge more than two files at once?
Yes — up to 5 inputs can be merged in a single pass. They are combined left-to-right, so the rightmost input has the final say on conflicting keys (unless you switch to A → B).
How are conflicts handled?
By default the value from the later document takes precedence (B → A), and arrays are concatenated. You can switch to A → B to keep the first document's value, or set the array strategy to Replace so the later array wins outright.
Does it merge nested mappings?
Yes — nested mappings are merged recursively under both conflict strategies, and arrays follow the chosen array strategy (Concat or Replace) at every depth.
What scenarios is this useful for?
Common use cases include merging Kubernetes manifests, combining Helm chart values across environments (base + dev/staging/prod overrides), and consolidating multi-file CI/CD config (GitHub Actions, GitLab CI) into a single review-friendly document.
Is my data sent to any server?
No, YAML merging is performed entirely in your browser. Both files are merged locally with JavaScript — nothing is uploaded.