Merge Excel Files — Free, Browser-Only
For monthly-reporting analysts on locked-down corporate laptops: drop a folder of XLSX workbooks, preview how their column headers align across the batch, and download one consolidated file. No install, no upload, no admin approval. Free, browser-only, runs behind any corporate firewall.
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Your files never leave your browser — guaranteed.
This tool runs 100% in your browser using JavaScript. No filenames, no row contents, nothing about your spreadsheets is transmitted to any server. Disconnect from the internet — it still works.
Drop your Excel files here, or click to choose
Accepts .xlsx and .xlsm — drop a whole folder if your browser supports it.
How it works
What does "header alignment" mean?
When you drop multiple files, the tool collects every column header across the batch and shows you which ones appear in all files versus only some. This way you see mismatches (e.g. Total $ vs. Total Sales) before merging produces garbage.
Which sheet is merged?
v1 reads the first sheet of each workbook. Multi-sheet merging is on the roadmap.
What about formulas and formatting?
Cell values are preserved. Formulas are evaluated to their last cached values; rich-text formatting, fonts, and colours are dropped. The output is a clean data sheet, not a formatted report.
How big can the batch be?
You'll see a warning above ~500 MB of total input. The hard limit is your browser's memory — modern browsers handle hundreds of MB comfortably.
What is Excel file merging?
Excel file merging (also called workbook consolidation or appending) is the act of combining multiple separate .xlsx or .xlsm files into a single consolidated workbook. Two common shapes: row-append (stacking all the rows from each input below each other on one sheet — standard for “combine 12 monthly reports into one annual file”) and sheet-collect (each input becomes its own sheet in the output workbook). The challenge is almost never the merge itself — it's catching column header mismatches before they corrupt the consolidated file.
SimpleTool's Excel merger runs entirely in your browser using SheetJS. Source files never leave your device. The killer feature is the header alignment preview — before any consolidation happens, you see which columns line up across all inputs, which are named differently, and which exist in only some files. You fix the mismatch upstream or accept it intentionally, then merge with confidence. No install, no admin approval, works on any locked-down laptop with a modern browser.
When do you need to merge Excel files?
The exhausting Friday-afternoon workflows where bulk consolidation beats VBA macros, Power Query setup, or a cloud upload.
Monthly reports from regional offices
Each region (NA, EMEA, APAC, LATAM) submits a monthly P&L or pipeline file in the same template. Consolidating the 4-12 regional files into one global file is the recurring Friday task. The header-alignment preview catches the one office that renamed "Revenue" to "Sales" before it ships up to the CEO.
Sales pipeline consolidation
Each rep maintains their own pipeline workbook (or one is pulled per territory from the CRM as XLSX). Consolidating into a single view for the weekly sales meeting needs to happen fast. Header alignment catches when one rep renamed "Close Date" to "Target Close".
Vendor / supplier data consolidation
Each supplier sends quarterly pricing, inventory, or compliance data as their own Excel template. Consolidating 30 supplier files into a comparable master list is the procurement team's recurring pain. Local merging avoids uploading commercial-sensitive data to a third party.
Survey response consolidation
Researchers exporting survey results from multiple panels, regions, or campaigns into separate XLSX files. Stacking them into one analysis-ready file with consistent columns enables downstream Python / R / Power BI without round-tripping through a cloud service.
Expense report rollups
Finance teams gathering individual expense reports from across a department or region. Each report comes out as an Excel attachment from email or the expense system. Bulk consolidation into a single review file beats copy-paste 60 times.
Inventory file consolidation
Operations teams receive per-warehouse or per-store inventory snapshots as separate Excel files. Consolidating them into one company-wide stock view exposes shortfalls and stranded inventory by SKU, in a format that drops cleanly into reporting.
HR onboarding data consolidation
New-hire onboarding forms submitted as Excel templates by each new hire (or by each hiring manager) get consolidated into a single roster file for HRIS bulk import. Local merging avoids exposing PII to a third-party processor.
Multi-department budget consolidation
Each department head submits their annual budget in the same Excel template. Finance consolidates 20+ budgets into one master view before board review. Header preview catches the department that added an extra row or renamed a category before it skews the rollup.
Excel Merge Methods Compared: SimpleTool vs Power Query vs VBA vs Cloud Mergers
Four ways to consolidate workbooks. Different setup cost, different IT-policy implications.
| Feature | SimpleTool | Power Query | VBA Macro | Cloud Mergers |
|---|---|---|---|---|
| Cost | Free | Bundled with Excel | Bundled with Excel | Free with limits |
| Files stay private (no upload) | Yes | Yes (desktop) | Yes | No — uploaded |
| Setup time | 30 seconds | 15-30 min per shape | 20-60 min to write | 2 minutes per merge |
| Header-alignment preview | Yes (built-in) | Manual M-code | Manual coding | Variable |
| Works without Excel installed | Yes (browser) | No | No | Yes (browser) |
| Works on locked corporate laptop | Yes | If Office installed | If macros allowed | Yes |
| Reusable across batches | Yes (re-drop) | Yes (saved query) | Yes (paste macro) | Manual repeat |
| Handles 50+ files in one pass | Yes | Yes | Yes | Often capped |
| Account required | No | Microsoft account | No | Usually yes |
| Source policy / data exposure | Client-side, no logs | Microsoft policy | Local only | Files retained then deleted |
Power Query is genuinely the right answer if you have Excel installed AND the same merge runs every month on the same template — invest 30 minutes building the query, save it, re-run forever. SimpleTool wins when (a) you don't have Excel install permission, (b) the templates aren't stable enough for a one-time query investment, or (c) the data is sensitive enough that you don't want it in any Microsoft cache.
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