How big a CSV can it open?

Files of tens of megabytes and hundreds of thousands of rows open in most browsers.

Can I edit the result before downloading?

Yes. The file opens in Mega Excel Studio, a full spreadsheet with an AI assistant — change anything, then download.

Is it safe to open CSV files here?

Yes. Your file travels over an encrypted connection and stays private to you — nobody else can open it. Projects you save are kept in your account until you delete them, and download links we email you expire after 7 days.

Excel Tools

CSV Viewer

Open CSV files as a clean table you can sort and filter. It opens in Mega Excel Studio, so you can check and change anything before you download.

Drop a CSV file

or browse from your device — .csv and .tsv — any size your browser can hold

Private & secure· Edit as you view· No watermark

Open CSV files online — and edit them

Opening a big CSV in a text editor shows a wall of commas. Drop your file and it opens in Mega Excel Studio. The CSV opens as a clean table with a frozen header, ready to sort, filter, search and chart. Edit anything you like — and download it in another format whenever you need to.

Sort, filter, search

A real table, not a wall of commas.

Checked in Mega Excel Studio

A full editor, not a read-only preview.

Download when you need

Save it as another format in a click.

Frequently asked questions

You can open your file, convert it and check or change everything in the studio before you pay anything. Downloading the finished file is part of every MojoPDF plan — start with the 7-day trial for $1 and cancel any time.