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Open a CSV file in your browser

Drop a file in. It opens here, and it stays here.

  • Hundreds of thousands of rows
  • Sort and filter any column
  • Nothing uploaded
  • Free, no account

CSV or TSV. Drag it here, or choose a file.

Why it exists

Almost every "online CSV viewer" uploads your file to a server and asks you to trust what happens next. This one cannot: the parser runs inside the tab, the file is read straight off your disk, and there is no request to send it anywhere because there is nowhere to send it to.

What it does

  • Opens CSV and TSV, detecting the delimiter, header row and encoding.
  • Streams the file rather than loading it whole, so size is bounded by the tab, not the parser.
  • Sort by any column, and filter rows with a plain-text match.
  • Shows the row and column count the moment parsing finishes.

What it does not do

It will not remember your file. Close the tab and it is gone — there is no upload, no account and no local database, which is also why there is nothing to clear afterwards. If you want a file to still be there tomorrow, that is what the app is for.

Questions

Is my CSV file uploaded anywhere?
No. The file is read from your disk by the browser and parsed inside the tab. It is never sent to a server. The query engine itself is downloaded from a public CDN the first time you open a file — that is program code arriving, not your data leaving.
How large a file can it open?
On a desktop browser, files in the hundreds of megabytes are routine. The limit is the memory the browser gives the tab, not the tool. On a phone that ceiling is much lower, and the tool warns you before it tries.
Does it work offline?
After the first load, largely yes — the engine is cached by the browser. The first visit needs a connection to fetch it.

The longer answer

This page does the job. The guide explains it — including the parts a tool cannot decide for you.

How to open a 1GB CSV file (2026 guide)A gigabyte is where most tools stop being honest about what they can do. Here is what genuinely opens a 1GB CSV, what it costs in RAM, and what quietly truncates.

The other tools