Convert Buddy

Free Online XML, CSV, JSON & NDJSON Converter

Convert and transform large files directly in your browser. No uploads. Rust-powered streaming engine.

Supported Formats

XMLCSVJSONNDJSON

Convert a file Use the library

Runs locally

No uploads required

Handles large files

Multi-GB streaming

Low memory

Deterministic resource use

Core

Rust + WebAssembly

Assurance

Deterministic processing, visible performance.

Convert Buddy keeps conversion and transformation in a controlled pipeline with live telemetry so you can trust every run.

Streaming conversion and transformation pipelines.
Detection and validation with overrideable configs.
Performance metrics emitted every interval.

Popular Conversions

XML → JSON CSV → JSON JSON → CSV NDJSON → JSON JSON → NDJSON CSV → NDJSON

For data users

Convert files safely in your browser

Upload nothing. Stream everything. Convert Buddy keeps large files local while showing real-time throughput, memory usage, and outputs.

Go to converter

For developers

Adopt the streaming engine

Ship Convert Buddy in browsers and Node. Integrate streaming conversion, detection, and transformation in minutes.

View developer docs

Convert Buddy is a browser-based data format converter supporting XML, CSV, JSON, and NDJSON. It uses a Rust streaming engine compiled to WebAssembly to process large files locally with low memory usage and no server uploads. Handles multi-GB files using streaming parsing.