XLSX Template Filler

Fill existing styled/formula Excel templates by replacing {{variable}} placeholders only

Fill placeholders without breaking template design.

  • Preserves workbook styles, formulas, and merged cells
  • Replaces only text placeholders like {{customer.name}}
  • Supports strict mode for missing variables

Example Results

1 examples

Fill Styled Excel Template

Replace template placeholders while preserving original styles, formulas, and merged cells

xlsx-template-filler-example1.xlsx View File
View input parameters
{ "templateFile": "/public/samples/xlsx/xlsx-template-filler-template.xlsx", "variablesJson": "{\n \"title\": \"Sales Summary\",\n \"report_date\": \"2026-03-05\",\n \"customer\": {\n \"name\": \"Elysia Labs\"\n },\n \"total_amount\": 12850.75\n}", "strictMode": false }

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel

Key Facts

Category
Conversion & Encoding
Input Types
file, textarea, checkbox
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The XLSX Template Filler allows you to automate report generation by injecting data into pre-designed Excel templates without disrupting complex formatting, formulas, or merged cells.

When to Use

  • •Generating recurring invoices or reports based on a fixed visual design.
  • •Populating Excel templates with dynamic data from external JSON sources.
  • •Maintaining consistent branding and styling across bulk-generated spreadsheets.

How It Works

  • •Upload your existing Excel file containing {{variable}} placeholders.
  • •Provide a JSON object mapping your data to those specific placeholders.
  • •Process the file to generate a new spreadsheet with the data injected while keeping all original styles intact.

Use Cases

Automating the creation of monthly financial statements from database exports.
Generating personalized client project status reports using a standardized template.
Batch-producing inventory manifests or shipping labels from a central data source.

Examples

1. Automated Invoice Generation

Accountant
Background
The accounting team uses a highly stylized Excel invoice template with specific branding and tax calculation formulas.
Problem
Manually typing client details into the template is error-prone and slow.
How to Use
Upload the invoice template and provide a JSON object containing the client name, invoice number, and total amount.
Example Config
{"customer": {"name": "Elysia Labs"}, "invoice_no": "INV-2026-001", "total_amount": 12850.75}
Outcome
A perfectly formatted Excel file is generated with all placeholders replaced, ready for distribution.

2. Bulk Report Population

Data Analyst
Background
A weekly sales summary report requires consistent formatting across multiple regional branches.
Problem
Updating the report manually often leads to broken cell styles or accidental formula deletion.
How to Use
Use the template filler to inject weekly sales figures into the pre-styled report template.
Example Config
{"title": "Sales Summary", "report_date": "2026-03-05", "total_amount": 12850.75}
Outcome
The report is generated instantly, maintaining all original design elements and active formulas.

Try with Samples

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FAQ

Will this tool break my existing formulas?

No, the tool specifically targets text placeholders and leaves your formulas and cell references untouched.

Does it support nested JSON data?

Yes, you can use dot notation in your placeholders, such as {{customer.name}}, to access nested values in your JSON.

What happens if a placeholder is missing in the JSON?

If Strict Mode is disabled, the placeholder remains as-is. If enabled, the tool will flag the missing variable.

Can I use this for files with merged cells?

Yes, the tool is designed to preserve the layout, including merged cells and custom styling.

Are there limits on the template file size?

The tool supports files up to 200MB, ensuring you can handle large, data-heavy report templates.

API Documentation

Request Endpoint

POST /en/api/tools/xlsx-template-filler

Request Parameters

Parameter Name Type Required Description
templateFile file (Upload required) Yes -
variablesJson textarea Yes -
strictMode checkbox No -

File type parameters need to be uploaded first via POST /upload/xlsx-template-filler to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-xlsx-template-filler": {
      "name": "xlsx-template-filler",
      "description": "Fill existing styled/formula Excel templates by replacing {{variable}} placeholders only",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=xlsx-template-filler",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]