New: Excel ↔ CSV Converter — Private, Instant, In Your Browser

We’ve added a built‑in converter that turns Excel files into CSV and CSV back into Excel — all locally in your browser. No uploads, no waiting, 100% private.

Why a Converter?

CSV is great for data pipelines, APIs, and analytics; Excel shines for formatting and formulas. Many workflows need both formats. Our converter bridges the gap with zero setup.

How It Works (Under the Hood)

We load a lightweight Excel engine (SheetJS) at runtime and handle conversion client‑side:

1. Excel → CSV: upload .xlsx/.xls/.xlsm, pick a sheet, download its CSV

1. CSV → Excel: upload or paste CSV text, export to .xlsx

Nothing leaves your device — files never touch our servers.

Supported Formats

• Excel: .xlsx, .xls, .xlsm

• CSV variants: comma (,), semicolon (;), tab (TSV)

• Unicode: UTF‑8 recommended

Tips for Clean Conversions

• Keep headers consistent across sheets

• Quote values that include commas or semicolons

• Prefer UTF‑8 for accents and emojis

Try It Now

Open the Converter from the top navigation or go to /convert. It’s fast, private, and free.

— The CSV Viewer Team