YAML Viewer Online — Free YAML Tree Browser

Paste any YAML — Kubernetes manifest, Helm chart, Docker Compose, Ansible playbook — and read it as a clean, normalised, indented tree. 100% browser-based, no upload.

Input YAML

Rendered Tree

What is a YAML Viewer?

A YAML viewer parses a YAML document and renders it as a clean, canonical, indented tree so you can scan its structure without fighting whitespace inconsistencies. It is the read-only counterpart to a YAML editor: you paste, you read, you move on. For developers triaging Kubernetes manifests, Helm chart values, or someone else's Compose file, a good viewer is the fastest way to see what is in the file.

OpenFormatter's YAML viewer renders the parsed structure entirely in your browser using JavaScript. There is no upload, no server, and no rate limit. Every key, list item, and nested mapping is shown with consistent two-space indentation regardless of how the input was formatted, making cluttered or inconsistent YAML readable at a glance.

How to view YAML online — 4 steps

Paste your YAML. Paste a manifest, Compose file, or chart values into the Input panel — or click Load Sample for a Kubernetes Deployment.
Click View. The viewer parses the document client-side and renders the structure in the right panel.
Scan the tree. Read keys, nested objects, and list items in a normalised layout. Inconsistent whitespace is removed.
Copy the clean version. Copy the rendered tree to share a clean canonical version with teammates or include in docs.

Sample YAML — input and rendered view

Here is a typical Kubernetes Deployment as input. The viewer normalises the indentation and produces a canonical rendered tree on the right.

Input

apiVersion: apps/v1
kind: Deployment
metadata:
   name:    web-app
spec:
    replicas: 3
    template:
       spec:
          containers:
            - name: nginx
              image: nginx:1.25

Rendered tree

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app
spec:
  replicas: 3
  template:
    spec:
      containers:
        - name: nginx
          image: nginx:1.25

Normalised Indentation

Inconsistent whitespace is collapsed into clean two-space indentation, making any YAML — no matter how it was authored — instantly readable.

Tree Structure

Every nested key, list item, and mapping is shown in canonical hierarchy. Long manifests with deep nesting become scannable in seconds.

Private Browsing

YAML is parsed in JavaScript inside your browser. Your file is never sent over the network — verified in DevTools.

When to use a YAML viewer

check_circleReviewing kubectl get -o yaml output without opening a terminal
check_circleReading a Helm chart values.yaml that uses anchors and aliases
check_circleInspecting Docker Compose v3 service blocks with deep nesting
check_circleBrowsing GitHub Actions workflow files with many jobs and steps
check_circleReading Ansible playbooks and inventory variables
check_circleInspecting OpenAPI / Swagger YAML to understand the API surface
check_circleQuickly scanning a yaml dump from a CI build artefact
check_circleReviewing CRD definitions and validating their structure visually

YAML viewer vs YAML editor vs YAML formatter

All three tools render YAML, but they serve different jobs. A viewer is read-only and focuses on display — paste, read, move on. A YAML editor lets you type and edit a document with syntax highlighting and live validation. A YAML formatter rewrites the file with consistent indentation so you can save the cleaned version back. If you only need to read someone else's YAML, the viewer is the lightest option.

Want to do more than view?

Edit, validate, format, or convert YAML with the rest of OpenFormatter — all in your browser.

YAML Validator YAML Formatter YAML to JSON

Frequently Asked Questions

What is a YAML viewer?

A YAML viewer parses a YAML document and renders it as a clean, normalised, indented tree so you can scan structure quickly. Unlike a plain text editor, the viewer collapses inconsistent whitespace and tab/space mixes into a single canonical layout, making nested keys, lists, and types easier to read.

How is a YAML viewer different from a YAML editor?

An editor lets you type and modify YAML in place. A viewer is read-only and focuses on display: it renders the parsed structure of an existing YAML file. Use a viewer when you receive a manifest from a teammate, are reviewing a config dump, or want to scan a long file without scrolling through hand-formatted whitespace.

Can I view Kubernetes manifests in this viewer?

Yes. Paste any Kubernetes resource — Deployment, Service, ConfigMap, Ingress, CronJob, CustomResourceDefinition — and the viewer renders the parsed tree. It works with kubectl get -o yaml output, manifests from Git, or generated YAML from Kustomize and Helm.

Does the viewer resolve YAML anchors and aliases?

Yes. Anchors (defined with &) and alias references (introduced with *) are resolved during parsing, so the viewer shows the actual concrete values rather than the alias names. This makes it much easier to inspect DRY YAML files that re-use blocks.

Will it render multi-document YAML files?

Yes. Multi-document YAML files using --- separators are supported. Each document is rendered in order so you can scroll the entire file as a single normalised view.

Is my YAML uploaded anywhere?

No. The viewer parses YAML in the browser using JavaScript. Your file never leaves the device — secrets, tokens, kubeconfig blobs, and proprietary configuration stay local. You can confirm this in DevTools → Network: no requests fire when you click View.

How large a YAML file can I view?

The viewer comfortably handles files in the low megabytes — well above the size of typical manifests, Compose files, Helm charts, and Ansible inventories. Very large dumps (hundreds of MB) should be split or streamed instead.

Can the viewer show me where a key is defined inside the YAML?

The viewer surfaces the full normalised path to every key (for example metadata.labels.app), which you can search for in your editor. For deep YAML trees this is faster than scrolling through the raw file.