Shift-JIS ⇔ UTF-8 Converter

Convert text files between Shift-JIS and UTF-8 encoding in your browser. No installation, results in seconds.

Drag & drop a file here, or click to browse

When this helps

Accounting staff

An old accounting system exports Shift-JIS CSVs that garble when opened in modern tools.

Convert the export to UTF-8 before importing into Excel or a spreadsheet.

Developers

A client's legacy system only accepts Shift-JIS uploads.

Convert a UTF-8 export back to Shift-JIS before sending it on.

FAQ

Is my file uploaded to your servers?
No — if your browser supports WebAssembly (WASM, a technology that runs software safely and quickly right inside your browser), the file never leaves your device. If that isn't available, it falls back to normal server-side processing, which also discards the file immediately after returning the result — nothing is stored either way.
What's the file size limit?
10MB per file on the free tier.