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CrossConvert

CrossConvert

Format Transfer

Convert between JSON, CSV, YAML, and TOML on Mac. Smart flattening, pretty-print, minify, and offline processing for developers and data engineers.

100% Offline No Data Collection Free Tier Mac App Store
Download on the Mac App Store
Developer Tools macOS

Privacy & Security

All data processing happens locally on your device. No uploads, no tracking, no accounts required.

Fully offline operation

All conversions run locally on your Mac. No data is sent to external servers, APIs, or browser-based services.

No account required

Use the app immediately after download. No registration, sign-in, or subscription needed.

No analytics or telemetry

CrossConvert does not include tracking SDKs, ad frameworks, or usage analytics of any kind.

Your data stays on your device

Input data, converted output, and clipboard contents are never cached, transmitted, or stored externally.

Features

Unified Converter
Convert between JSON, CSV, TOML, and YAML effortlessly. Automatically detects input format.
Flexible Formatting
Pretty Print or Minify output. Custom indentation (2 or 4 spaces). Auto-detect CSV delimiters.
Smart Flattening & Nesting
Flatten nested structures into dot-notation columns. Convert arrays into multiple CSV rows.
Versatile Export & Save
Copy, paste, or load files directly. Choose output filename and destination.
For Pros and Beginners
Suitable for data scientists, developers, writers, and anyone handling structured text.

How It Works

1

Step 1

Paste structured data or import a file — CrossConvert auto-detects whether it is JSON, CSV, YAML, or TOML

2

Step 2

Choose your target output format and configure flattening, nesting, and delimiter preferences

3

Step 3

Preview the converted output with pretty-print or minified formatting

4

Step 4

Export the result to a file or copy it to your clipboard instantly

Use Cases

Flatten API responses into spreadsheet-ready CSV
Take nested JSON payloads from REST or GraphQL APIs and flatten them into tabular CSV that analysts, PMs, or QA engineers can open directly in Excel or Google Sheets.
Translate configuration files across environments
Convert YAML Kubernetes configs to TOML for a Rust service, or turn a JSON settings file into YAML for an Ansible playbook—without hand-editing or writing a script.
Prepare and validate test data
Normalize mixed-format test fixtures into a consistent format before running contract tests, integration suites, or data-validation checks.

Compatible Sources & Providers

Works with all major email clients, cloud services, and data sources.

REST and GraphQL APIs

Paste JSON responses from API debugging tools like Postman, Insomnia, or curl and convert them to CSV, YAML, or TOML for downstream use.

Kubernetes and Docker configs

Convert between YAML and JSON for Kubernetes manifests, Docker Compose files, and Helm chart values without manual reformatting.

CI/CD pipeline configs

Translate between YAML (GitHub Actions, GitLab CI) and other formats when porting pipeline definitions or generating config variations.

Data analysis workflows

Turn JSON data exports into CSV for spreadsheet analysis, or convert CSV datasets into JSON for loading into databases and APIs.

Rust and Go projects (TOML/YAML)

Handle TOML configuration files common in Rust (Cargo.toml) and convert them to YAML or JSON for interoperability with other tools.

How It Compares

ConvertCSV.com

Typical use

A popular browser-based conversion suite supporting CSV, JSON, XML, YAML, and many other formats. Client-side processing keeps data local in the browser. Offers an API for high-volume use. Limited formatting and flattening controls compared to a desktop app.

Great Apps advantage

CrossConvert provides a native Mac interface with richer flattening and nesting controls, persistent format settings, and no browser dependency—ideal for developers who convert data frequently throughout the day.

jq and yq (CLI tools)

Typical use

Powerful command-line processors for JSON (jq) and YAML/TOML (yq). Preferred by developers comfortable with filter syntax and shell scripting. jq alone cannot output YAML, and yq has two competing implementations with different feature sets.

Great Apps advantage

CrossConvert handles all four formats in one visual interface with zero command syntax. It is faster for quick conversions and more accessible for team members who do not live in the terminal.

json-csv.com and similar online tools

Typical use

Lightweight browser tools for quick one-off JSON-to-CSV or CSV-to-JSON conversions. Easy to use but limited in formatting options and not suitable for sensitive or large datasets.

Great Apps advantage

CrossConvert runs offline on your Mac, supports TOML and YAML in addition to JSON and CSV, offers smart flattening for nested data, and lets you save output directly to disk.

What Users Say

★★★★★

“I used to juggle between ConvertCSV, jq, and a YAML-to-JSON website. CrossConvert replaced all three with a single app that sits in my dock and handles everything instantly.”

Senior Backend Engineer
★★★★★

“The flattening controls are exactly what I needed for turning deeply nested API responses into clean CSVs for our analytics team. It saved me from writing yet another Python script.”

Data Platform Engineer
★★★★★

“Our DevOps team uses it daily to translate config files between YAML, TOML, and JSON when deploying across different service stacks. It just works.”

DevOps Team Lead

Frequently Asked Questions

What formats does CrossConvert support?

CrossConvert converts between JSON, CSV, YAML, and TOML. It auto-detects the input format so you can paste or import data without specifying the source type.

Can CrossConvert handle nested JSON with arrays and objects?

Yes. The smart flattening engine converts nested structures into dot-notation columns for CSV and handles arrays by expanding them into multiple rows. You can control the depth and style of flattening.

How does CrossConvert compare to using jq or yq on the command line?

jq and yq are powerful but require learning filter syntax and are limited to specific formats. CrossConvert provides a visual interface that handles all four formats without any command syntax, making it faster for everyday conversions.

Is my data sent to any server during conversion?

No. CrossConvert processes everything on your Mac. It works fully offline and never transmits data externally.

Can I use CrossConvert to convert Kubernetes YAML configs to JSON?

Yes. Paste or import your YAML manifest and CrossConvert will output valid JSON. This is useful for tools and APIs that expect JSON input.

Does CrossConvert support pretty-printing and minification?

Yes. You can choose between pretty-printed output with configurable indentation (2 or 4 spaces) and minified output for compact file sizes.

What CSV delimiter options are available?

CrossConvert auto-detects the delimiter in CSV input (comma, semicolon, tab, etc.). For output, you can configure the delimiter to match your target tool's expectations.

Who is CrossConvert designed for?

Backend developers, data engineers, DevOps practitioners, QA engineers, and data analysts who regularly work with structured data formats and need fast, reliable conversions without leaving their desktop.

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Ready to get started?

Download CrossConvert from the Mac App Store.

Download on the Mac App Store