XLSX Template Filler

XLSX Template Filler | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Format Conversion
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

1Upload your existing Excel file containing {{variable}} placeholders.
2Provide a JSON object mapping your data to those specific placeholders.
3Process 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.

{"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.

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.

{"title": "Sales Summary", "report_date": "2026-03-05", "total_amount": 12850.75}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Automated Invoice Generation

2. Bulk Report Population

FAQ

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