AI Excel Macro Generator: Turn Plain English Into VBA (Free)

TL;DR

• The AI Excel macro generator at excelmacros.net writes a working VBA macro from a plain-English prompt. No coding, no copy-paste from Stack Overflow.
• It checks 53 prebuilt macros first. If one already does what you asked, it serves that instead of generating new code.
• Every generated macro runs through a validator that rejects unsafe patterns (file deletion, shell calls, network access). If the first attempt fails the validator, the model retries once.
• Free: 1 generation per IP per day with no signup, then 3 per month after a magic-link email confirmation.

What the AI Excel macro generator does

It turns a sentence describing what you want into a .bas VBA module you can paste into Excel and run. You describe the operation in normal English. The site picks the right path: serve a prebuilt tool from the catalog if one fits, or hand the request to Claude Sonnet to write a custom macro. Either way you walk away with a working macro and an explanation of how to use it.

It is not a code-completion assistant. You do not look at your sheet and ask for the next line. You describe the whole task once, and you get the whole macro back.

How it works in 4 steps

Type a description into the search box on the homepage. Then this happens behind the scenes.

1. A matcher reads your prompt against the 53 prebuilt macros in the catalog. If the match is high-confidence, you get a link to that prebuilt tool and the AI generator never runs.
2. If no prebuilt tool fits, the prompt is handed to Claude Sonnet with a strict instruction set: write one self-contained Sub, no external calls, no file I/O outside the active workbook, include user-friendly error handling, return .bas text plus a short explanation.
3. A validator runs over the response before you see it. It checks the module structure, looks for forbidden patterns (Shell, CreateObject("WScript.Shell"), Kill, network calls), and confirms the explanation is non-empty. If the validator rejects the response, the generator retries once with the failure reasons appended to the prompt.
4. You get the result as a code block with copy and download buttons. Paste it into the Visual Basic editor (Alt + F11), close, then run the macro from Alt + F8. Microsoft's enable the Developer tab guide covers the one-time setup if you have never opened the editor before.

Most AI code-generation demos only show the happy path. We made the validator reject the macro and retry before the user ever sees it, because a model that confidently produces broken VBA is worse than a model that admits it could not write something safely.

A real example: highlighting cross-column outliers

A finance analyst at a 4-branch retailer is auditing a monthly transactions sheet. She wants to flag rows where today's spend in column D is more than double yesterday's spend in column E, but only for vendors marked Active in column F. Conditional formatting handles single-column rules. This needs row-level logic.

Here is the actual prompt sent to the live generator while writing this post:

Highlight every row in red where the value in column D is more than twice the value in column E, only for rows where column F is the word Active.

About four seconds later, this came back, copied verbatim from the response:

Attribute VB_Name = "HighlightActiveOutlierRows"
Option Explicit

' Highlight Active Outlier Rows
' Offline. No API calls. No external dependencies.

' Scans every row inside the current selection. For rows where column F
' contains the word "Active" (case-insensitive, trimmed), it checks whether
' the value in column D is more than twice the value in column E. Matching
' rows are highlighted red across the full used width of the sheet.

Public Sub HighlightActiveOutlierRows()
    Dim ws As Worksheet
    Dim r As Range
    Dim lastCol As Long
    Dim i As Long
    Dim startRow As Long, endRow As Long
    Dim dVal As Double, eVal As Double
    Dim fVal As String
    Dim highlightCount As Long, skippedCount As Long

    On Error GoTo CleanFail
    Set ws = ActiveSheet
    Set r = Selection
    If r Is Nothing Or r.Cells.CountLarge < 1 Then GoTo NoSelection

    startRow = r.Row
    endRow = r.Row + r.Rows.Count - 1
    lastCol = ws.UsedRange.Column + ws.UsedRange.Columns.Count - 1
    If lastCol < 6 Then lastCol = 6

    Application.ScreenUpdating = False
    For i = startRow To endRow
        fVal = Trim$(CStr(ws.Cells(i, 6).Value))
        If StrComp(fVal, "Active", vbTextCompare) <> 0 Then
            skippedCount = skippedCount + 1
            GoTo NextRow
        End If
        If Not IsNumeric(ws.Cells(i, 4).Value) Or _
           Not IsNumeric(ws.Cells(i, 5).Value) Then
            skippedCount = skippedCount + 1
            GoTo NextRow
        End If
        dVal = CDbl(ws.Cells(i, 4).Value)
        eVal = CDbl(ws.Cells(i, 5).Value)
        If eVal = 0 Then
            skippedCount = skippedCount + 1
            GoTo NextRow
        End If
        If dVal > 2 * eVal Then
            ws.Range(ws.Cells(i, 1), ws.Cells(i, lastCol)) _
                .Interior.Color = RGB(255, 99, 99)
            highlightCount = highlightCount + 1
        End If
NextRow:
    Next i
    Application.ScreenUpdating = True

    MsgBox highlightCount & " row(s) highlighted." & vbCrLf & _
           skippedCount & " row(s) skipped (not Active or non-numeric).", _
           vbInformation
    Exit Sub
NoSelection:
    MsgBox "Select the rows you want to scan first.", vbExclamation
    Exit Sub
CleanFail:
    Application.ScreenUpdating = True
    MsgBox "Error: " & Err.Description, vbCritical
End Sub

A few things this output proves. Variables are declared with explicit types. Application.ScreenUpdating is toggled around the loop, so a 50,000-row sheet does not redraw 50,000 times. Non-numeric cells in D or E are skipped instead of crashing the run. Division by zero on eVal is guarded. And the macro reports how many rows it touched and how many it skipped, so the analyst can sanity-check before saving the workbook.

The whole call took under five seconds against the live API, including the validator pass. Writing the same macro by hand is a 15-minute job for someone fluent in VBA, and a "give up and use a helper column" job for everyone else.

What if there's already a tool for it?

Before the generator runs, the matcher checks your prompt against the 53 prebuilt macros in the catalog. If the match is high-confidence, you get the prebuilt tool, not a generated one.

This matters because prebuilt is better than generated when prebuilt fits. The catalog tools have been hand-written, hand-tested, packaged as .xlsm files, and run by real users. The generator is best for the long tail; the catalog is best for the head.

A second test run while writing this post: the prompt "Split a US address column into separate columns for street, city, state, and ZIP code, handling rows where the comma between city and state is missing" could plausibly have triggered AI generation. Instead, the matcher routed it to the Split Cell on Delimiter tool with high confidence, because that tool already handles the underlying mechanic. The AI generator stayed out of the way.

If the matcher routes you somewhere wrong, rephrase to be specific about the unique twist your task has. The second pass usually falls through to generation.

What it can and can't do

The generator targets single-task, single-sheet macros. That covers most of what an Excel power user wants automated.

What works well:

• Cell-level transformations (format, parse, clean, normalize)
• Row-level conditional logic (highlight, hide, copy, count)
• Column operations (split, combine, dedupe by rule)
• Text extraction and string manipulation
• Date and number coercion

What it will refuse or fail to write:

• File-system operations (the validator rejects Kill, MkDir, file copies)
• External API or HTTP calls (no MSXML2, no WinHttp)
• UserForms or custom dialog boxes beyond MsgBox and InputBox
• Cross-workbook automation that opens or saves other files
• Anything that needs to run on a schedule or as a Windows service

The free quota is 1 anonymous generation per IP per day. After that, a magic-link email unlocks 3 generations per month. The email is there to stop bots from draining the API budget. It is not sold and is not used for marketing.

Frequently asked questions

Is the AI Excel macro generator free?

Yes. The first generation each day requires no signup. After that, a magic-link email unlocks 3 generations per month at no cost. There is no paid tier yet. The catalog of 53 prebuilt macros is unlimited and always free.

Is the generated VBA safe to run?

The generator is constrained to write self-contained macros with no file-system writes outside the active workbook, no shell calls, and no network access. A validator rejects responses that contain those patterns. That said, always read the code before you run any macro from any source. The output is short enough to scan in under a minute.

Does it work in Excel for Mac and Excel for the web?

Excel for Mac runs VBA macros, so generated macros work there. Excel for the web does not run VBA at all, so you cannot use this (or any other VBA macro) in the browser version. Desktop Excel on Windows or Mac is required.

What if the generator gets it wrong?

Rephrase and try again. The most common cause of weak output is a vague prompt. Be specific about which columns you mean (by letter or header name), what counts as a match, and what the macro should do with non-matches. If the second attempt still misses, the request may be outside what a single VBA Sub can sensibly express.

What to do next

Open the AI Excel macro generator on the homepage and type the macro you wish Excel had. If you want a worked starting point, try: "Find every cell in column B that contains an email address, then copy the email and the value in column A to a new sheet called Contacts."

If you would rather start from the catalog, the closest hand-built cousins of the example above are Compare Two Columns, Highlight Duplicates, and Highlight Blank Cells.