The HappyCSV Blog
Tutorials, guides, and tips to help you master your data.
Anonymize CSV Data (GDPR/Testing)
How to mask sensitive data in CSV files. Anonymize names, emails, and phones for testing or GDPR compliance.
Batch Convert Multiple Excel Files to CSV
How to convert 100 Excel files to CSV at once. Use VBA macros, Python scripts, or batch converters to save hours of manual work.
Best Free CSV Viewers for Mac & Windows
Excel isn't the only way to open CSVs. Check out the best free CSV viewers like Tad, Miller, and online tools for large files.
How to Clean Email Lists Before Sending (5-Step Guide)
Clean your email list to improve deliverability and avoid spam complaints. Remove duplicates, validate formats, and fix common issues.
[Combine CSV Files](https://happycsv.com/blog/merge-multiple-csv-files) from Multiple Folders
How to merge CSV files scattered across different subfolders. Recursive merging using Command Line and Python.
Compare Two CSV Files (Find Differences)
How to compare two CSV files to find added, removed, or changed rows. Methods using Excel, command line, and diff tools.
Convert CSV to Excel with Formatting
Turn a plain CSV into a professional Excel report. Learn how to auto-format as a Table, add filters, and adjust column widths automatically.
Convert CSV to XML (For Legacy Systems)
How to convert CSV files to XML format. Understand elements vs attributes, schema validation, and tools for conversion.
Convert CSV to YAML (For Config Files)
Convert CSV data to YAML format. Perfect for DevOps configuration files, Kubernetes manifests, and static site data.
Convert Excel to CSV (Without Losing Data)
Learn how to convert Excel files to CSV format without losing formatting, formulas, or data. Step-by-step guide with common problem fixes.
Convert JSON to CSV (Developer's Guide)
Convert JSON files to CSV format easily. Handle nested objects, arrays, and complex structures. Perfect for developers and data analysts.
Convert Multi-Sheet Excel to Multiple CSVs
How to export every sheet in an Excel workbook to separate CSV files. Use VBA macros, Python, or online tools to save time.
CSV Delimiters Explained (Comma, Tab, Semicolon)
Why do some CSVs use semicolons? What is a delimiter? Learn about commas, tabs, pipes, and how to handle different CSV formats.
CSV File Size Limits (Excel, Sheets, Databases)
What is the maximum size for a CSV file? Learn the limits of Excel, Google Sheets, and databases, and how to handle files that are too big.
Convert CSV to JSON (Complete Guide with Examples)
Learn how to convert CSV files to JSON format. Handle nested objects, arrays, and complex transformations with practical examples.
CSV vs XLSX vs TXT: Which Format to Use?
Compare CSV, XLSX (Excel), and TXT formats. Understand the differences, file size, compatibility, and when to use each for your data.
Why Won't My CSV File Open in Excel? (7 Fixes)
Troubleshoot CSV files that won't open in Excel. Fix file associations, size limits, corruption, and encoding issues.
Excel Changed My CSV Numbers (How to Stop This)
Fix Excel's annoying auto-formatting that removes leading zeros, turns numbers into dates, and displays scientific notation. Keep your data intact.
Excel vs CSV: Which Should You Actually Use?
Understand the real differences between Excel and CSV files. Learn when to use each format and how to convert between them without losing data.
How to Combine Facebook Lead Reports (The Fast Way)
Merge multiple Facebook lead export files into one master list. Step-by-step guide for marketers dealing with monthly or campaign-based lead downloads.
Find and Replace in CSV Files (Bulk Edit Guide)
How to find and replace text across large CSV files. Learn methods for Excel, text editors, and specialized tools to bulk edit your data.
Fix CSV Encoding Issues (UTF-8 Guide)
Fix weird characters in your CSV files. Understand UTF-8 vs ANSI, fix mojibake (), and ensure your data displays correctly everywhere.
Fix 'EndOfStreamException' and CSV Errors
Troubleshoot common CSV parsing errors like 'Unexpected end of file', 'Invalid column count', and 'Unescaped quote'.
Generate SQL INSERT Statements from CSV
Convert CSV data into SQL INSERT statements. A guide for developers to quickly populate databases from spreadsheet data.
How to Clean CSV Data Without Losing Your Mind
Learn practical techniques to clean messy CSV files. Remove duplicates, fix formatting, and standardize data without Excel crashes or complex scripts.
How to Create a CSV File (3 Easy Methods)
Learn how to create CSV files using Excel, text editors, or code. A step-by-step guide for beginners and developers.
How to Open CSV Files (5 Easy Ways)
Learn 5 ways to open CSV files - Excel, Google Sheets, text editors, and more. Fix common problems like wrong formatting and encoding issues.
Import CSV to MySQL/PostgreSQL (Step-by-Step Guide)
Learn how to import CSV files into MySQL and PostgreSQL databases. Command-line and GUI methods with error handling and best practices.
Import CSV to HubSpot (Contacts & Companies)
A complete guide to importing contacts, companies, and deals into HubSpot from CSV. Learn how to map properties, handle associations, and fix errors.
Import CSV to Salesforce (Step-by-Step Guide)
Learn how to import CSV data into Salesforce using Data Import Wizard and Data Loader. Tips for mapping fields, handling IDs, and avoiding errors.
Import Products to WooCommerce via CSV
Bulk upload products to WooCommerce using the built-in CSV importer. Handle images, variations, categories, and attributes correctly.
Import Transactions to QuickBooks Online
How to import bank transactions into QuickBooks Online using CSV files. Format your dates and amounts correctly to avoid errors.
Merge CSV Files with Different Headers
How to [combine CSV files](https://happycsv.com/blog/merge-multiple-csv-files) that have different columns. Learn about union, intersection, and schema mapping to merge mismatched data.
Merge CSV Files in Order by Date
How to [merge multiple CSV files](https://happycsv.com/blog/merge-multiple-csv-files) and ensure the final result is sorted chronologically. Avoid messy, unsorted data dumps.
Merge Mailchimp Exports (Email Marketing Guide)
How to combine multiple Mailchimp CSV exports into one master list. Clean duplicates, merge tags, and prepare for re-import.
How to Merge Multiple CSV Files (The Easy Way)
Combine multiple CSV files into one master file without Excel crashing. Step-by-step guide for merging CSV files with different structures.
How to Prepare CSV Files for Python Pandas
Clean and format your CSV files for seamless import into Python Pandas. Avoid encoding errors, type mismatches, and parsing issues.
How to Remove Duplicates from CSV Files (3 Methods)
Remove duplicate rows from CSV files using Excel, Google Sheets, or specialized tools. Learn when to use exact vs fuzzy matching.
Remove Empty Rows and Columns from CSV
Clean up your CSV by removing blank rows and empty columns. Fix messy exports that break your database imports.
How to Repair Broken CSV Files
CSV file won't open? Lines shifting? Quotes broken? Learn how to diagnose and repair corrupted CSV files.
How to Prepare Shopify Product CSV (Complete Import Guide)
Learn the exact Shopify CSV format for bulk product imports. Avoid common errors and import your products successfully on the first try.
[Split CSV](https://happycsv.com/blog/split-large-csv-files) by Date or Year
How to split a large CSV file into multiple files based on a date column. Separate data by year, month, or day.
How to Split Large CSV Files (3 Easy Methods)
Split large CSV files that are too big for Excel. Learn how to divide CSV files by row count or column values. Handle files over 1 million rows.
Transposing CSV Data (Rotate Rows to Columns)
How to transpose CSV files—swapping rows and columns. Use Excel Paste Special, Python Pandas, or online tools to reshape your data.
What is a CSV File? (Simple Explanation)
Learn what CSV files are, why they're useful, and how they differ from Excel. Simple guide for beginners with real examples.