Tablizer

Convert IIF to CSV Online

Paste an IIF table below, edit it if you need to, and get CSV back. The conversion runs in your browser, so nothing is uploaded, there is no size limit and there is no signup.

From

The only part of this site that uses a server. The address is sent to it so the page can be fetched, because a browser is not allowed to fetch someone else's page itself. Your own files are never involved.

Nothing here is uploaded. The parsing happens on this page.
Edit
Paste or upload something above and it will appear here.
ToDataMarkupDocumentsCodeSchemasImages

The output will appear here once there is a table to convert.

What IIF is

IIF is QuickBooks Desktop's import and export format: tab-separated, with several tables interleaved in one file. A line starting with an exclamation mark defines the columns for a record type, and the data lines that follow begin with that type's keyword.

QuickBooks Desktop users, and the bookkeepers who have to move data into and out of it.

What CSV is

CSV is a text file where each line is a row and commas separate the fields. There is no type system, no formatting and no second sheet. Every value is text until something downstream decides otherwise.

Almost every database, analytics tool and spreadsheet can read and write it, which is why exports default to it.

What changes when you convert IIF to CSV

The largest table in the file is used, which is almost always the transactions. A typical export holds TRNS rows for the transactions and SPL rows for their split lines; those are two tables, not one, and combining them would produce a column layout that fits neither.

Any value containing the delimiter, a quote or a line break gets wrapped in quotes, and embedded quotes are doubled. That is the rule in RFC 4180 and it is what spreadsheet software expects.

What carries over from IIF to CSV

IIF records 2 things about a table that CSV has no way to hold.

IIF distinguishes a number from the text of a number; CSV does not, so every value arrives as text and has to be re-parsed by whatever reads it next.

CSV has no separate idea of a header, so the column names become an ordinary first row and nothing in the file marks them as different from the data.

A worked example

Three rows of staff data, with an identifier that has a leading zero, a value containing a comma, a value containing quotes and one blank cell. Those are the four places formats disagree, so they are the four places to look.

IIF in
!TRNS	TRNSTYPE	DATE	ACCNT	NAME	AMOUNT	MEMO
!SPL	TRNSTYPE	DATE	ACCNT	NAME	AMOUNT	MEMO
!ENDTRNS
TRNS	CHECK	01/15/2026	Checking	Greenfield Grocers	-42.50	Weekly shop
SPL	CHECK	01/15/2026	Groceries	Greenfield Grocers	42.50	Weekly shop
ENDTRNS
TRNS	DEPOSIT	01/16/2026	Checking	Acme Ltd	1850.00	January salary
SPL	DEPOSIT	01/16/2026	Salary	Acme Ltd	-1850.00	January salary
ENDTRNS
CSV out
id,name,role,started,hours
007,Halima Yusuf,"Analyst, data",2024-03-15,38.5
012,"Jonah ""Jo"" Pryce",Engineer,2025-11-02,
104,Wei Chen,Manager,2023-06-30,40

Questions

How do I convert IIF to CSV?

Paste your IIF into the box above or drop the file onto it. Check the table in the grid, then copy or download the CSV from the output panel. It takes one step and the data never leaves your browser.

Why does my IIF file have two sets of headers?

Because it holds two tables. TRNS lines are transactions and SPL lines are the splits belonging to them, and each has its own column definition. They are separate exports that happen to share a file.

Why does my CSV open with all the data in one column?

The file uses a delimiter your spreadsheet did not expect. Exports from European locales often use semicolons because the comma is the decimal separator there. Change the delimiter in the export options and the columns split correctly.

Will my numbers still be numbers?

They will read the same, but CSV stores them as text. Anything that sorts or sums the result will need to parse them first, and a leading zero or a currency symbol is the usual place that goes wrong.

Is there a limit on file size?

No. The work happens on your own machine, so the limit is your machine's memory rather than an upload cap. A file with tens of thousands of rows converts in a second or two.

Is my data uploaded anywhere?

No. The parsing and generating are done by JavaScript running on this page. You can watch the network tab while you convert and see that nothing is sent.

Related conversions