PrettifyPrettify

View, validate, and
transform any data format.

A beautiful, distraction-free viewer for JSON, YAML, CSV, XML, Mermaid, Markdown, and MDX. Paste your data and explore it instantly. No sign-up needed, and your documents stay on your device.

The format is detected for you. Nothing is uploaded.

or — no download

VpasteKcommandsDtheme
{
"company": "Acme Corp",
"founded": 2019,
"active": true,
"employees": [
{
"id": 1,
"name": "Alice Johnson",
"role": "CEO",
"salary": 185000
},
{4 keys},
{4 keys}
]
}
Try jq— 122 builtins, livePro
$
3
jq builtins, built in
122jq builtins, built in
line files, scrolled smoothly
100K+line files, scrolled smoothly
formats, one editor
7formats, one editor
uploads to view or edit
0uploads to view or edit

7 formats, one tool

Built for Claude skills

Edit a SKILL.md, frontmatter and all.

The frontmatter opens as a Properties card, so you edit name, description, and allowed-tools field by field. The Preview shows the instructions as a document that you edit in place. With Pro, Skill Check tests the file against the Agent Skills and Claude Code rules and lists each problem.

Free to open and edit. Skill Check is Pro, with one free try per day.

Built for developers

Every feature designed around the workflows developers actually use.

Explore

One document, every useful angle

Switch between tree, source, table, diagram, chart, and preview without reopening or converting your file.

6 views
{}company.json1.8 KB
TreeRawTableDiagramChartPreview
▾{
"company": "Acme Corp",
▾"employees": [
▸3 records
],
"active": true
}
Selected
employees
Type
Array
Items
3 objects
Path
root.employees
root.employeesValid JSON
Query

Ask the data, right where it lives

Filter and calculate with jq for JSON and YAML, SQL for CSV, or XPath for XML—without uploading your file.

jqSQLXPath
Local
Query
$.employees | map(.salary) | add
Result
512,000
Total payroll
Execution
In browser
< 1 ms
Your document stays on this device unless you share it

Power tools for power users

Everything you need to work with data, built in.

Type Generation

Paste JSON, get TypeScript. Or Go, Kotlin, Rust, JSON Schema — generated instantly.

Input
{
  "id": 42,
  "name": "Ada",
  "active": true,
  "roles": ["admin", "user"]
}
Output · TypeScript
export interface User {
  id:    number;
  name:  string;
  active: boolean;
  roles:  string[];
}

Free vs Pro

Free is generous. Pro is everything.

Free

Everything you need to get started

Included: 7 formats (JSON, YAML, CSV, XML, Mermaid, Markdown, MDX)
Included: Tree, Raw, Table views
Included: Markdown and MDX Preview with editable frontmatter
Included: Syntax highlighting & validation
Included: Search & Replace with regex
Included: Format conversion
Included: Unlimited tabs
Included: Share via compressed URL (up to ~32 KB)
Not included: Unlimited-size share links (short URLs)
Not included: jq Query Engine (122 builtins)
Not included: SQL Query Panel
Not included: XPath Query Panel
Not included: JSON Schema Validation
Not included: Diagram view & multi-column charts
Not included: Diff & Compare
Not included: Split view (side-by-side panes)
Not included: Markdown side by side, Outline, and Export
Not included: Skill Check for Claude skills
Not included: Full history (30 docs, 50 versions)
Not included: All future features
Recommended

Pro

One-time payment, yours forever

$19.99

Included: 7 formats (JSON, YAML, CSV, XML, Mermaid, Markdown, MDX)
Included: Tree, Raw, Table views
Included: Markdown and MDX Preview with editable frontmatter
Included: Syntax highlighting & validation
Included: Search & Replace with regex
Included: Format conversion
Included: Unlimited tabs
Included: Share via compressed URL (up to ~32 KB)
Included: Unlimited-size share links (short URLs)
Included: jq Query Engine (122 builtins)
Included: SQL Query Panel
Included: XPath Query Panel
Included: JSON Schema Validation
Included: Diagram view & multi-column charts
Included: Diff & Compare
Included: Split view (side-by-side panes)
Included: Markdown side by side, Outline, and Export
Included: Skill Check for Claude skills
Included: Full history (30 docs, 50 versions)
Included: All future features

Pricing

One-time payment. Yours forever.

Every future feature included — no subscriptions, no recurring fees.

$19.99lifetime
All Pro features, forever
Every future update included
No subscriptions, no recurring fees
30-day money-back guarantee

FAQ

Frequently asked questions