How it works
粘贴 JSON、格式化器在ローカル解析并进行美化或压缩；语法无效时显示清晰错误信息。
在ブラウザ中美化、压缩并验证 JSON、支持语法高亮。
Raw JSON
Interactive JSON tree
Valid JSON will appear as an interactive tree…
粘贴 JSON、格式化器在ローカル解析并进行美化或压缩；语法无效时显示清晰错误信息。
Conversions run in your tab with JavaScript — no desktop app required.
Files stay on your device during processing. We do not receive your uploads.
Heavy codecs and AI models run locally via Web Workers and WASM (FFmpeg.wasm, Transformers.js).
粘贴 JSON、格式化器在ローカル解析并进行美化或压缩；语法无效时显示清晰错误信息。
超大 JSON 可能使标签页卡顿。仅验证语法——不解析 schema 或远程引用。不支持二进制或非 UTF-8 内容。
Yes. This tool is free convert online with no signup. Processing stays in your browser — no uploads.
You control quality settings. Choose higher quality for no quality loss when converting online.
Every conversion runs inside your browser tab using JavaScript and Web Workers. There is no background server queue and no account is required for core tools.
Your files are never uploaded to FreeConvertKit for processing. Originals, previews, and exports stay on your device unless you choose to download or share them yourself.
When codecs or AI models are needed, WebAssembly modules such as FFmpeg.wasm and Transformers.js execute locally — giving you desktop-class power with absolute file privacy.