Online CSV, Excel & JSON Toolkit
View, Edit & Convert Files
✔ No sign-up required · ✔ No server uploads · ✔ Works locally
DataDesk is a privacy-first online data editor and converter for CSV, Excel (XLSX), and JSON files. View, edit, and convert between formats — including CSV, XLSX, JSON, and PDF — All file processinghappens directly inside your browser using modern client-side parsing technology — keeping your data secure and under your control.
CSV Tools
Excel Tools
JSON Tools
CSV viewer online
- Go to CSV Viewer path
- Open your CSV file
- Scroll and pan large datasets smoothly
- filter data, Search and sort rows instantly
- Export CSV file with your changes (sorted/filtered)
- Also You can export csv with your selected columns and rows
How to edit CSV files without Excel
- 1Open the CSV Editor
- 2Open your CSV file in your browser
- 3Scroll and pan large datasets smoothly
- 4Search, filter, and sort rows instantly
- 5Export CSV file with your changes (sorted/filtered)
How to Convert CSV to XLSX (Excel) files online
- Go to CSV Converter path
- Open your CSV file
- Your CSV file are reday to export in Excel, JSON or PDF format
- Scroll and pan large datasets smoothly
- Search, filter, and sort rows if you want
- Export CSV file with your changes (sorted/filtered)
- Export CSV file to Excel (XLSX) format with one click
Open & View Excel (XLSX) files online
- 1Open your spreadsheet using the XLSX Viewer
- 2Preview and navigate your Excel file instantly
- 3Search data, Sort, Hide/show and filter columns easily
- 4Download the updated spreadsheet securely
- 5Every step runs locally in your browser
How to edit Excel (XLSX) files online
- Open your Excel file using the XLSX Editor
- Preview and navigate your Excel file instantly
- Search data, Sort, Hide/show and filter columns easily
- Edit any cell directly in your browser
- Download the updated Excel file securely
How to convert Excel to CSV online
- 1Open the XLSX to CSV converter
- 2Load your Excel file locally
- 3Conversion runs instantly in your browser
- 4Download the CSV file by clicking the 'Export as CSV' button
- 5Excel to CSV, Excel to JSON & Excel to PDF option are away from Just one click
How to view JSON files in Table online
- Open the JSON viewer
- open a local .json file
- Flatten nested objects into rows
- Preview JSON data in a clean table
- Tree view is also available for better visualization of nested JSON data
- Table view and Tree view are Searchable, Sortable and Filterable for better data exploration
How to Edit JSON files in your browser
- 1Open the JSON Editor
- 2View json data in a clean table format with nested objects flattened into rows
- 3Tree view is also available for better visualization of nested JSON data
- 4Table, Tree Both are Searcable and editable for better data exploration and manipulation
- 5Edit any cell directly in your browser and see the changes reflected in the JSON structure instantly
- 6Download the updated JSON file securely with one click
How to convert JSON to CSV/Excel
- Open the JSON Converter tool
- Open a local .json file
- Preview JSON data in a clean table OR Data tree
- In table view, flatten nested objects into rows
- Search, sort, Edit and filter your JSON data to explore it better
- As soon as you open your JSON file, it's ready to export in CSV, Excel or PDF format
- Export as CSV, Excel or PDF format
Built for Developers, Analysts, Business & Data Teams
Whether you’re cleaning datasets, exporting API responses, reviewing Excel reports, or working with sensitive CSV files, DataDesk helps you get the job done without sending your data to the cloud.
Everything you need to know
Quick answers about our privacy-first data toolkit.
Can I open XLSX files without having Excel installed?
Yes. DataDesk is a standalone web-based viewer. You can open, read, and edit .xlsx and .xls files without a Microsoft Office subscription.
Which file formats can I convert?
You can view, edit, and convert between CSV, Excel (XLSX), and JSON. You can also export any file as a PDF report.
Can I convert JSON to a table format?
Yes, in json-converter DataDesk automatically flattens nested JSON data into a clean, editable table which you can then export to Excel, CSV or PDF. also TREE VIEW is available for better visualization of nested JSON data.
Is my data secure?
Absolutely. We don't have servers that store your data. Everything runs locally in your browser. We do not upload or store your files.
How do I convert CSV to Excel?
Simply open your CSV file in our csv-converter and click the 'Export' button to save it as an XLSX file instantly.
Can I convert Excel to PDF locally?
Yes. You can open any Excel (XLSX), JSON or CSV file and export it directly to a PDF report without using any cloud-based conversion services.
Is there a file size limit?
No hard-coded limit. DataDesk is limited only by your device's memory. Our virtualization engine is designed to handle 500k+ rows smoothly.
Can I use it for free?
Yes, DataDesk is a free web-based utility for developers, analysts, and anyone needing to clean data quickly.
Microsoft wants your credit card. 💳
Google forces a signup. 👤
Datadesk? Just drop your file. 🚀
Servers are for others.
Your PC is for your data.
We use Client-Side Parsing. That's a fancy way of saying your files never leave your browser. No "cloud," no hackers, no third-party eyes. Just pure, private execution.
FAST.
Handles 500k+ rows without breaking a sweat. No more "Page Unresponsive" popups.
Contact & Support
Have a feature request, bug report, or feedback? We’d love to hear from you.
We don’t store your files. Messages are used only to improve DataDesk.