Are my CSV and Excel files uploaded to any server?

No. Every converter in this suite runs entirely client-side using JavaScript in your browser memory. Your files and data are never sent to our servers or stored anywhere.

What is the maximum file size for CSV and Excel conversions?

Most tools support files up to 25MB. Because all processing happens in your browser memory, this limit ensures fast performance without freezing your browser tab.

Can I convert Excel (.xlsx) files directly?

Yes. Our Excel converters support real Microsoft Excel .xlsx workbooks, allowing you to extract sheets to CSV, convert workbooks to XML, or render print-ready PDFs.

How does the CSV cleaner handle duplicate rows?

The Clean CSV tool compares every row in your dataset, stripping out exact duplicate entries, eliminating empty rows, and trimming accidental leading or trailing whitespace.

CSV, Excel & Data Suite

Transform, split, clean, and convert spreadsheets and tabular datasets directly in your browser with zero server uploads.

All Converters CSV, Excel & Data Suite Format & Developer Utilities Document & Archive Processors Unit & Number Converters

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CSV to JSON

Turn CSV rows into clean, formatted JSON instantly.

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JSON to CSV

Flatten any JSON array into a ready-to-use CSV.

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CSV to Excel

Convert CSV into a real .xlsx spreadsheet.

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Excel to CSV

Extract sheet data from Excel into CSV.

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Split CSV

Break a big CSV into smaller files as a ZIP.

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Clean CSV

Remove dupes, empty rows, and trim data.

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TSV to CSV

Convert tab-separated values into CSV.

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CSV to TSV

Convert comma-separated values into TSV.

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CSV to SQL

Generate SQL INSERT & DDL from CSV files.

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Fast, secure spreadsheet & tabular data conversions

Convert369's CSV, Excel & Data Suite is purpose-built for data engineers, analysts, accountants, and developers who work with tabular information daily. From transforming messy customer CSV exports into structured JSON or SQL INSERT queries, to splitting massive workbooks into chunks and extracting raw data from HTML or Markdown tables, every tool executes locally within your web browser. Your sensitive financial, customer, and internal company data is never transmitted to an external server.

Zero Server Uploads & Complete Data Confidentiality

Unlike traditional web conversion platforms that upload your files to remote cloud storage buckets for backend conversion, Convert369 performs all data parsing, encoding, and schema generation locally inside your browser tab using WebAssembly and memory streams. Once converted, your data stays strictly on your machine.

Accurate Handling of Real-World Delimiters & Encodings

Spreadsheets from different software and international locales often use commas, semicolons, tabs, or pipe symbols as delimiters, often with quoted multiline text. Our CSV engine automatically detects delimiters, resolves line endings (CRLF and LF), and handles complex embedded quotes without mangling column alignment.

Developer-Ready Database Seeding & Schema Export

Need to seed a Postgres, MySQL, or SQLite database from a spreadsheet? Our CSV to SQL converter scans data types across thousands of rows to generate precision CREATE TABLE DDL and bulk INSERT INTO statements, saving hours of manual scripting.