YAML Compare
Compare two YAML files side-by-side and highlight the differences.
Related Tools
Learn more about the YAML Compare
What is YAML Comparison?
YAML comparison (or YAML diffing) is the process of checking two YAML documents against each other to find exactly what differs between them — which lines were added, removed, or changed. Because YAML relies on indentation rather than braces to define structure, and is commonly used for Kubernetes manifests, Docker Compose files, CI/CD pipeline configs, and Ansible playbooks, spotting a single changed value by eye across two long files is slow and easy to get wrong.
A YAML compare tool automates that by diffing both documents line by line and highlighting exactly what changed, so a modified port number, image tag, or environment variable buried deep in a nested block doesn't slip past review.
This is especially useful before applying a Kubernetes manifest to a cluster, reviewing a pull request that touches a Compose file or pipeline config, or auditing configuration drift between staging and production.
This page lets you compare two YAML files online for free, directly in your browser. Paste the original and modified YAML into the two editors, click Compare, and see a side-by-side diff with additions and removals color-coded — nothing is uploaded or sent to a server.
Why Compare YAML?
Kubernetes Manifests
Diff Deployment, Service, or ConfigMap YAML between clusters or before/after a change to confirm only the intended fields differ.
Docker Compose
Compare docker-compose.yml across environments to catch drifted ports, volumes, or environment variables before they cause an outage.
CI/CD Pipelines
Spot exactly what changed in a GitHub Actions or GitLab CI config when a pipeline suddenly starts behaving differently.
Ansible Playbooks
Review changes between playbook versions to confirm a refactor didn’t silently alter task order or variables.
Example
Here are two versions of the same app config — comparing them flags the changed host, port, and debug values, plus the added ssl key.
server:
host: localhost
port: 3000
debug: true
database:
host: db.local
name: myapp_devserver:
host: api.example.com
port: 8080
debug: false
database:
host: db.prod.example.com
name: myapp_prod
ssl: trueFeatures
Compare
Diff two YAML documents and highlight added, removed, and changed lines.
Nested Structures
Deeply nested keys and lists — common in Kubernetes and Ansible YAML — are compared just as reliably as top-level fields.
Paste from Clipboard
Paste YAML directly into either editor with a single click.
Sample Data
Load two sample YAML configs to see how the diff view works.
How to use
Paste your input in the left editor. The output appears automatically on the right. Use the toolbar buttons to copy, download, or transform the result.
- Paste or type your content in the input editor on the left.
- The formatted output is generated automatically.
- Use Copy, Download, or other actions from the output toolbar.
- Click the expand icon to view the output in fullscreen.
FAQ
Is this YAML compare tool free?
Yes, the YAML compare tool is completely free to use with no limits, signup, or account required.
Is my YAML data uploaded to a server?
No. All comparison happens entirely in your browser using JavaScript. Your YAML is never uploaded or sent to a server.
How does YAML Compare work?
Paste two YAML documents into the editors and click Compare. Added lines are highlighted in green, removed lines in red, so you can spot changes line by line.
Can I compare Kubernetes manifests or Docker Compose files?
Yes. Any valid YAML works, including Kubernetes manifests, Docker Compose files, GitHub Actions workflows, and Ansible playbooks.
Does it support multi-document YAML?
Currently single YAML documents are supported. Multi-document (---separated) support is planned.
Does whitespace or key order affect the comparison?
The comparison is a text diff, so indentation and line order are reflected in the result. For a structural (key-based) comparison, format both files first to normalize style.