twineconvert

free · in-browser · no upload

CSV to OFX
Converter

Drop your CSV file. We'll convert it to OFX right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .csv

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a CSV from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your OFX the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert CSV → OFX

What this conversion is actually for

Your bank only gives CSV, but your accounting/budget app (Quicken, GnuCash, older Money, some bookkeeping tools) imports OFX. Convert so the transactions land in your books with proper structure instead of a manual CSV mapping every time.

A real example

Your bank exports CSV only. GnuCash's clean import path is OFX. Convert your statement CSV to OFX here, import into GnuCash, payee/amount/date mapped automatically.

Troubleshooting

Dates or amounts imported wrong.

OFX expects specific date (YYYYMMDD) and signed-amount conventions. Make sure the source CSV's date column is unambiguous and debits are negative. If your bank's CSV uses a regional date format, normalize it in a spreadsheet before converting.

Duplicate transactions after import.

OFX uses FITID to dedupe; a CSV usually has no stable transaction ID, so re-importing overlapping date ranges can double up. Import non-overlapping ranges, or let your finance app's duplicate detection catch them.

Formats involved

About CSV and OFX

CSV, Comma-Separated Values

CSV is plain text, one row per line, fields separated by commas. The simplest possible tabular data format, which is exactly why it remains the most portable: every spreadsheet, database, programming language, and analytics tool reads CSV. Tradeoffs: no formulas, no formatting, no multiple sheets, and various edge cases around quoting fields that contain commas or newlines.

How to open

Excel, Google Sheets, Apple Numbers, LibreOffice Calc, any text editor, every database import wizard, every programming language with one line of code.

Full CSV format guide →
OFX, Open Financial Exchange

OFX is the standard file format banks use to export account history. Created in 1997 by Microsoft, Intuit, and CheckFree, it carries transactions, balances, and account metadata in XML. Quicken, GnuCash, Tiller, Money in Excel, and most personal-finance apps import OFX directly.

How to open

Quicken, GnuCash, Moneydance, Tiller, most accounting software. Plain-text editors can view the XML structure.

Full OFX format guide →

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FAQ

Common questions

Is this CSV → OFX converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert CSV to OFX?

Universal tabular data interchange. Bank statements imported into personal-finance software. The most common reason to convert is compatibility, OFX works in places where CSV doesn't, or vice versa.

How do I open a CSV file in the first place?

Excel, Google Sheets, Apple Numbers, LibreOffice Calc, any text editor, every database import wizard, every programming language with one line of code.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.