Comma-Separated Values (.csv)
RFC قياسيComma-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.
تحويل XLSX إلى CSV
محول مجاني داخل المتصفح للتحويل من XLSX إلى CSV. قم بتحويل الملفات فوراً على جهازك.
ضغط CSV عبر الإنترنت
ضغط محلي 100% داخل المتصفح - لا يتم رفع ملفاتك إلى أي خادم أبداً
فحص البيانات الوصفية
تتعرف أنظمة التشغيل ومحللات الملفات على ملفات CSV من خلال فحص تسلسل البايت الثنائي البادئ:
توقيع رأس الملف على مستوى البايت (Magic Bytes)
تتعرف أنظمة التشغيل ومحللات الملفات على ملفات CSV من خلال فحص تسلسل البايت الثنائي البادئ:
التوقيع الست عشري (الإزاحة 0):
Plain Textتمثيل ASCII: ASCII / UTF-8
القياسية: RFC 4180 / IETF
المواصفات الفنية
| هيكلية الحاوية | Delimited flat text file representing tabular data rows and columns |
| الضغط | Gzip / Deflate achieves 85%-95% compression on repetitive tabular records |
| ترتيب البايتات (Endianness) | UTF-8 text stream (optional UTF-8 BOM EF BB BF used by Excel) |
| مساحات الألوان | Not applicable |
| القنوات والبنية | Row records delimited by CRLF with columns delimited by commas |
| الحد الأقصى للأبعاد | Unbounded; streamable to gigabytes without loading entire file in memory |
| الشفافية | Not applicable |
| البث والتحميل التدرجي | Native line-by-line stream processing supported by all data pipelines |
مصفوفة المقارنة التقنية: CSV مقابل المنافسين
| السمة التقنية | CSV (الحالي) | 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 |
أنماط التلف الشائعة ودليل استرداد النظام السداسي
⚠️ Columns shift to the right or row counts do not match.
السبب الجذري: A text field containing an unescaped comma without surrounding quotation marks.
الاسترداد: 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.
السبب الجذري: Excel opened a UTF-8 CSV assuming the legacy Windows ANSI/CP1252 character encoding.
الاسترداد: Prepend the 3-byte UTF-8 Byte Order Mark (0xEF 0xBB 0xBF) to the beginning of the file.
تحليل الأمان وناقلات هجوم المحلل اللغوي
CSV files open directly in spreadsheet software like Excel and Google Sheets, exposing users to Formula Injection (CSV Injection) attacks.
ناقلات الهجوم المعروفة
- 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.
أفضل الممارسات الدفاعية: 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.
الأصول التاريخية والمحطات الرئيسية
المزايا الرئيسية والإيجابيات
- 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.
القيود الفنية والسلبيات
- 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.
معلومات تقنية طريفة
- 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.
الأسئلة التقنية المتكررة
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.
أزواج تحويل CSV ذات الصلة
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.