Comma-Separated Values (.csv)
RFC मानकComma-Separated Values (CSV) is a ubiquitous plain-text format for tabular data, where each line represents a data record and fields are separated by delimiter characters.
XLSX को CSV में कन्वर्ट करें
मुफ्त इन-ब्राउज़र XLSX से CSV कन्वर्टर। अपने डिवाइस पर तुरंत फ़ाइलें कन्वर्ट करें।
CSV ऑनलाइन कॉम्प्रेस करें
ब्राउज़र में 100% निजी कंप्रेसन — फ़ाइलें कभी भी आपके डिवाइस से बाहर नहीं जाती हैं
इंस्पेक्ट और मेटाडेटा
ऑपरेटिंग सिस्टम और फ़ाइल विश्लेषक शुरुआती बाइनरी बाइट अनुक्रम का निरीक्षण करके CSV फ़ाइलों की पहचान करते हैं:
बाइट-स्तरीय हेडर हस्ताक्षर (मैजिक बाइट्स)
ऑपरेटिंग सिस्टम और फ़ाइल विश्लेषक शुरुआती बाइनरी बाइट अनुक्रम का निरीक्षण करके CSV फ़ाइलों की पहचान करते हैं:
HEX हस्ताक्षर (ऑफ़सेट 0):
Plain TextASCII निरूपण: ASCII / UTF-8
मानकीकरण: RFC 4180 / IETF
तकनीकी विनिर्देश
| कंटेनर आर्किटेक्चर | Delimited flat text file representing tabular data rows and columns |
| कंप्रेशन | Gzip / Deflate achieves 85%-95% compression on repetitive tabular records |
| बाइट एंडियानेस | UTF-8 text stream (optional UTF-8 BOM EF BB BF used by Excel) |
| कलर स्पेस | Not applicable |
| चैनल और संरचना | Row records delimited by CRLF with columns delimited by commas |
| अधिकतम आयाम | Unbounded; streamable to gigabytes without loading entire file in memory |
| पारदर्शिता (Transparency) | Not applicable |
| स्ट्रीमिंग और प्रोग्रेसिव | Native line-by-line stream processing supported by all data pipelines |
तकनीकी तुलना मैट्रिक्स: CSV बनाम प्रतियोगी
| तकनीकी विशेषता | CSV (वर्तमान) | Excel (XLSX) | Parquet | JSON |
|---|---|---|---|---|
| File Type | Plain text flat table | Zipped XML spreadsheet | Binary columnar storage | Hierarchical text |
| Multiple Sheets | No (single flat table only) | Yes (multiple workbooks and sheets) | Partition-based storage | Nested arrays and objects |
| Data Types | Untyped raw text | Typed cells, formulas, formatting | Strict binary column types | Primitive types (string, number, bool) |
| Big Data Analytics | Slow (requires reading every row linearly) | Not suitable for big data | Ultra-fast (column pruning & predicate pushdown) | Moderate |
सामान्य करप्शन मोड और हेक्स रिकवरी गाइड
⚠️ Columns shift to the right or row counts do not match.
मूल कारण: A text field containing an unescaped comma without surrounding quotation marks.
रिकवरी: RFC 4180 requires fields containing commas to be wrapped in double quotes: "Smith, John".
⚠️ Accented characters render as strange symbols (mojibake like é instead of é) in Excel.
मूल कारण: Excel opened a UTF-8 CSV assuming the legacy Windows ANSI/CP1252 character encoding.
रिकवरी: Prepend the 3-byte UTF-8 Byte Order Mark (0xEF 0xBB 0xBF) to the beginning of the file.
सुरक्षा विश्लेषण और पार्सर अटैक वेक्टर्स
CSV files open directly in spreadsheet software like Excel and Google Sheets, exposing users to Formula Injection (CSV Injection) attacks.
ज्ञात अटैक वेक्टर्स
- Formula Injection: Cells starting with '=', '+', '-', or '@' executing spreadsheet macros or DDE commands (e.g. '=cmd|' /C calc'!A0').
- Data exfiltration via HYPERLINK() formulas sending sensitive cell data to remote attacker servers upon click.
सुरक्षात्मक सर्वोत्तम प्रथाएँ: When exporting user data to CSV, prepend a single quote (') or tab to any cell starting with '=', '+', '-', or '@' to force plain text rendering in Excel.
ऐतिहासिक मूल और मील के पत्थर
मुख्य लाभ और खूबियाँ
- Maximum simplicity: readable in any text editor and importable into every database and spreadsheet.
- Extremely fast line-by-line streaming without building a full in-memory DOM.
- Minimal overhead: no verbose tag syntax or schema definitions.
तकनीकी सीमाएँ और कमियाँ
- No standard data types: numbers, dates, booleans, and text are all stored as raw strings.
- No support for multiple sheets, cell formatting, formulas, or metadata.
- Delimiter conflicts (commas inside text, decimal commas in European locales) cause frequent parsing bugs.
रोचक तकनीकी जानकारी
- In many European countries where commas are used as decimal points, semicolons (;) are used instead of commas as CSV separators.
- Microsoft Excel historically required a UTF-8 BOM (0xEF 0xBB 0xBF) to correctly display non-ASCII accented characters.
अक्सर पूछे جانے वाले तकनीकी प्रश्न
What is RFC 4180?
RFC 4180 is the official IETF standard for CSV. It mandates that fields containing commas, line breaks, or double quotes must be enclosed in double quotes, and internal quotes must be escaped by doubling them ("").
Why do CSV files open with corrupted characters in Excel?
Older versions of Microsoft Excel default to the local Windows code page (like Windows-1252) rather than UTF-8 when opening CSV files directly. Adding a UTF-8 BOM (Byte Order Mark) at the start of the file forces Excel to decode UTF-8 correctly.
संबंधित CSV रूपांतरण जोड़े
Export Microsoft Excel spreadsheets into clean, comma-separated plain text tables.
Import CSV tabular data into formatted Microsoft Excel XLSX workbooks.
Import tabular CSV spreadsheet records directly into indexed SQLite database tables.
Extract table records and rows from SQL INSERT statements into standardized comma-separated CSV spreadsheets.
Extract multidimensional scientific datasets and numerical matrices from HDF5 (.h5) into tabular CSV format.
Flatten multidimensional NetCDF (.nc) climate and oceanographic variables into comma-separated CSV spreadsheets.
Convert electronic business cards (vCard / VCF) into tabular CSV contact lists for Excel and Google Contacts.