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DocWello
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100% Client-Side • Instant Speed

Online Excel Tools: Merge, Protect & Convert

Merge multiple Excel spreadsheets, password-protect sheets, split workbooks to ZIP, convert to CSV/JSON, and clean messy spreadsheet data. 100% Client-Side security.

Kéo thả các tệp Excel (.xlsx, .xls, .csv) vào đây

Chọn từ 2 tệp Excel trở lên để ghép thành 1 workbook đa Sheet hoặc nối dữ liệu thành 1 Master Sheet duy nhất.

Zero Server Upload
•Files never leave your device
RAM AES-256•HTML5 Client-Side
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Professional Office & Accounting Suite

Complete Guide to Client-Side Excel Spreadsheet Processing

Effortlessly combine multiple monthly department reports, protect formulas with password encryption, export to UTF-8 CSV, and clean messy whitespaces with zero server upload.

01

Fast Excel Merging

Combine dozens of workbooks into a multi-sheet file or merge data rows into a single Master Sheet.

02

Password Protection

Lock cell editing and protect proprietary formulas with standard password hashing.

03

Data Cleansing

Trim extra spaces, format proper capitalization, remove empty rows, and eliminate duplicates.

Quick FAQ

Frequently Asked Questions (FAQ)

Answers to common questions regarding features, client-side security, and usage.

Q1.Is merging and protecting Excel workbooks on DocWello safe for confidential business data?

100% secure. All processing, sheet merging, and password hashing execute entirely inside your local browser memory (RAM). Your files are never uploaded to any remote server or third-party cloud.

Q2.How does the Master Sheet merge mode work?

The Master Sheet mode preserves the column headers from the first workbook and automatically appends all subsequent data rows from remaining files into one single unified spreadsheet.

Q3.Can I export Excel sheets to clean UTF-8 CSV without broken characters?

Yes, our exporter embeds a standard UTF-8 BOM () header into every CSV download, ensuring accented characters open flawlessly across Microsoft Excel and all OS environments.

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