Frequently Asked Questions
Answers to common questions about our CSV, Excel, JSON, XML, and finance file conversion tools. For in-depth format tutorials, visit our format guides.
What file formats can I convert?
Convert CSV supports CSV, XLSX, JSON, XML, YAML, SQL, HTML tables, KML, GeoJSON, fixed-width text, and finance formats including OFX, QFX, QIF, and IIF. You can convert between these formats using the dedicated tool for each transformation — browse the tools directory or use the search box on the home page to find the right converter.
Is my data secure?
Yes. All file processing happens directly in your browser using JavaScript. Your files are never uploaded to our servers, stored in a database, or shared with third parties. When you close the browser tab, your data is gone. This client-side approach means your sensitive financial, customer, or business data stays on your device.
What's the maximum file size I can upload?
Files up to 5 MB work reliably across all tools. Smaller files (under 1 MB) convert almost instantly. Files approaching 5 MB may take a few seconds and use more browser memory. For very large datasets, split the source into smaller files, convert each part, and combine the results in the Online CSV Editor.
Do I need to create an account?
No account is required. Every converter and editor is free to use without registration, email verification, or subscription. Open a tool, upload or paste your data, and download the result immediately.
Can I edit my files before or after converting?
Yes. The Online CSV Editor and Online XLSX Editor let you upload spreadsheet files and edit them in a browser-based grid. You can fix values, delete rows, adjust headers, and export the cleaned file. Many workflows use the editor as a cleanup step: convert JSON to CSV, edit the result, then convert CSV to Excel.
What browsers are supported?
Convert CSV works in all modern browsers: Chrome, Firefox, Safari, and Edge. We recommend the latest version for best performance. Mobile browsers are supported but the editing experience is best on desktop for larger files.
Is Convert CSV really free?
Yes. All tools are free with no hidden charges, premium tiers, or usage limits. The site is supported by advertising. You can convert and edit as many files as you need.
Why does my CSV show garbled characters?
This is usually an encoding issue. The source file may be saved in Latin-1 or Windows-1252 instead of UTF-8. Open the file in a text editor (Notepad++, VS Code, or similar), check the encoding, and re-save as UTF-8. Then upload the corrected file. Our format guide on CSV explains this in more detail.
Why are all my columns merged into one?
Your file likely uses a different delimiter. European Excel versions often export semicolon-delimited files instead of comma-delimited. Try our CSV to Delimited converter to change the separator, or re-export the source file with comma delimiters.
Can I convert bank statement or accounting files?
Yes. The Finance File Converter hub supports OFX, QFX, QIF, IIF, and bank statement text. Each format has a dedicated converter page. For PDF bank statements, copy the transaction table text and paste it into the bank statement converter.
How do I convert JSON from an API response?
Copy the JSON response from your browser's network tab, API client, or log file. Paste it into the JSON to CSV converter and click Convert. Arrays of objects produce the cleanest result — each object becomes one row with keys as column headers.
Can I use Convert CSV for commercial work?
Yes. There are no restrictions on commercial use. Teams, businesses, and freelancers use our tools for everyday data conversion tasks. See our Terms of Service for full details.
What is the difference between CSV and Excel output?
CSV is a plain-text format that any application can read — it is universal but has no formatting, formulas, or multiple sheets. Excel (XLSX) is a binary format that opens natively in Microsoft Excel, Google Sheets, and LibreOffice with better handling of wide tables and numeric formatting. Use CSV for data pipelines and Excel when the recipient expects a spreadsheet file.
How do I report bugs or request features?
Email support@convertcsvonline.com or visit our contact page. Include the tool you were using, the input format, and a description of what went wrong. We read every message and prioritize fixes that affect multiple users.