FastCompiler
Open Compiler

Free CSV tools — without Excel, offline

View CSV online without Excel — preview, filter & convert to JSON

View CSV online without Excel — paste CSV or drop a .csv file to preview it as a sortable, searchable table, then convert CSV to JSON instantly. Everything runs in your browser — no sign-up, nothing uploaded, works fully offline.

Trusted by developers free, private, no upload.

Drop a .csv file here, or click to browse — your file never leaves your device

How to view a CSV file online without Excel

Answer in 30 seconds: Paste CSV text or drag and drop a .csv file, click View CSV, then click any column header to sort (numbers and text aware) or type to filter. Click Download JSON to convert CSV to JSON with headers as keys — all local, no Excel, no upload.

  1. 1

    Add your CSV data

    Paste CSV text, or drag and drop a .csv / .tsv file. Comma, semicolon or tab delimiters are auto-detected; quotes handled. Nothing is uploaded.

  2. 2

    Preview, sort and filter without Excel

    Data renders as a table instantly. Click headers to sort (numeric vs text), toggle First row is header, and filter rows live.

  3. 3

    Convert CSV to JSON or download CSV

    Click Download JSON to get a JSON array with headers as keys, or Download CSV for cleaned CSV. Works offline.

Convert CSV to JSON online without upload

Direct answer: After preview, click Download JSON to convert your CSV to a JSON array where each row becomes an object with column headers as keys — all in your browser, no upload, handles large files up to 10k rows.

Example

name,age
Alice,30
Bob,25

→ [{"name":"Alice","age":"30"},{"name":"Bob","age":"25"}]

Large & TSV

Auto-detects comma/semicolon/tab, so Excel semicolon exports and TSV tabs just work. Handles up to 10,000 rows (5000 rendered) with filtering.

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Frequently asked questions

How can I view a CSV file online without Excel?

Open this CSV viewer, paste CSV text or drag and drop a .csv file. It renders as a sortable, filterable table in your browser — no Excel, no install, no upload.

Can I convert CSV to JSON online?

Yes — click Download JSON to export a JSON array with headers as keys. Conversion is local, no upload, works offline.

Does it handle large files, semicolons and tabs?

Yes — delimiter auto-detected (comma/semicolon/tab), quotes parsed correctly, up to 10,000 rows (5000 rendered) with filtering and sort.

Can I open TSV or Excel CSV exports?

Yes — TSV tabs and Excel semicolon exports are detected. Export as CSV or JSON after preview.

Is my data uploaded anywhere?

No — parsing is local in your browser. Your spreadsheet never leaves your device.

Does it work offline?

Yes — runs entirely in your browser, works offline after page load.

Can I filter and sort without Excel?

Yes — click headers to sort numerically or alphabetically, and use the filter box to search all columns instantly.