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CSV to Excel

Converts CSV to Excel without the usual damage: long numbers keep their leading zeros, and you choose the delimiter rather than hoping Excel guesses right.

Choose your file

Drop your file here

CSV, TSV, TXT files. Nothing is uploaded — your file stays on this device.

Settings

Automatic detection is right almost always. Override it if columns come out wrong.

Writes long digit strings as text so Excel cannot turn 00123456789012345678 into 1.23E+19.

Add a file to continue.

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About CSV to Excel

What does CSV to Excel do?
Converts CSV to Excel without the usual damage: long numbers keep their leading zeros, and you choose the delimiter rather than hoping Excel guesses right.
Who is it for?
Analysts and operations teams moving data between systems, developers who need a quick format conversion, and anyone whose CSV keeps breaking when Excel opens it.
Is it free?
Yes. CSV to Excel is free with no account, no watermark on your output, no daily cap and no trial period. Because it runs on your own device it costs us nothing to run, which is why there is no catch.
Is it safe to use with confidential files?
Yes, and not because we promise to behave. CSV to Excel never sends your file anywhere — the work happens in your browser. There is no upload, so there is no copy of your document in our systems at any point.
What file formats are supported?
Input: CSV, TSV, TXT. Output: XLSX.
Why do my long ID numbers turn into 1.23E+14 in Excel?
Excel treats long digit strings as numbers and switches to scientific notation. This converter writes those columns as text when they have leading zeros or exceed 15 digits, which keeps them intact.
My CSV uses semicolons. Will that work?
Yes. The delimiter is detected automatically, and you can override it if the detection gets it wrong.

How to use it

  1. 1

    Add your file

    Drag it onto the box above, or use Browse files. On a phone you can also take a photo or pick from your camera roll.

  2. 2

    Check the settings

    Sensible defaults are already chosen. Most people never need to change them.

  3. 3

    Run it

    The progress bar shows real progress, not a decorative animation. Everything happens on your device.

  4. 4

    Preview the result

    Look at the output before you download. If it is not right, adjust a setting and run it again — nothing has been saved anywhere.

  5. 5

    Download

    Save the file. Closing this tab discards it from memory, so download anything you want to keep.