A YAML diff tool compares two YAML documents at the key level and shows which configuration keys were added, removed, or had values changed. Essential for reviewing Kubernetes manifests, Docker Compose updates, CI/CD configuration changes, and any YAML-based config file versioning.
How to Use the YAML Diff Tool
YAML configuration files drive modern infrastructure — Kubernetes pods, Helm charts, GitHub Actions pipelines, and Docker Compose stacks all use YAML. The free YAML diff tool makes it easy to spot what changed between two versions of any YAML file without opening a terminal.
Step 1: Paste Your YAML Documents
Paste the original (older) version into the left panel and the changed (newer) version into the right panel. The tool parses each document into a nested key-value structure. Indentation matters in YAML — make sure your pasted content preserves the original indentation.
Step 2: Click Compare
Click the Compare button to run the diff. The stats bar shows total keys added, removed, and values changed. Each change is displayed as a full key path (like database.pool.size) so you can immediately understand what changed and where in the hierarchy.
Reading the Diff Output
Green rows indicate key paths present only in the changed version. Red rows indicate key paths present only in the original that were removed. Yellow rows indicate key paths that exist in both versions but with different values — the value before and after are both shown for easy comparison.
Side-by-Side vs Unified View
Side-by-side view places the original and changed YAML in parallel columns with matching lines aligned. Unified view shows both in a single column with +/- prefixes. Use unified view when reviewing pull requests or audit logs.
Common Use Cases
DevOps engineers use the YAML diff tool to review Kubernetes manifest changes before applying with kubectl apply. Developers use it to audit environment configuration changes across staging and production. Platform engineers use it to compare Helm chart values between chart versions before upgrading.
FAQ
Is the YAML diff tool free?
Yes, completely free with no account or signup required. All YAML comparison runs in your browser — your data is never sent to any server.
Is my YAML data private?
Yes. All parsing and comparison happen locally in your browser's JavaScript engine. Your YAML configuration files, secrets, and keys never leave your machine.
How does the YAML key-path comparison work?
The tool parses each YAML document into a nested key-value structure, then compares key paths. A key path like 'database.host' is compared across both documents. Green entries are new key paths, red entries are removed, and yellow entries have changed values.
Does the tool support nested YAML documents?
Yes. The diff walks the full nested structure of each document, including objects, arrays, and scalar values at any depth level. Nested key paths are shown using dot notation for easy reading.
What YAML features are supported?
The tool supports standard YAML including nested objects, arrays, multi-line strings, booleans, numbers, and null values. It uses a lightweight parser that handles the most common YAML patterns used in config files.
Can I compare Kubernetes or Docker Compose YAML files?
Yes. Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and most configuration YAML files work well. The tool highlights exactly which keys changed between versions, making it easy to review before applying changes.