Comma-Separated Values (.csv)
RFC StandartComma-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 formatını CSV formatına dönüştür
Ücretsiz tarayıcı içi XLSX - CSV dönüştürücü. Dosyalarınızı cihazınızda anında dönüştürün.
CSV Dosyasını Çevrimiçi Sıkıştırın
Tarayıcıda %100 gizli sıkıştırma – dosyalarınız asla cihazınızdan çıkmaz
İncele & Meta Veriler
İşletim sistemleri ve dosya çözümleyicileri, CSV dosyalarını başlangıçtaki ikili bayt dizisini inceleyerek tanımlar:
Bayt Düzeyinde Başlık İmzası (Magic Bytes)
İşletim sistemleri ve dosya çözümleyicileri, CSV dosyalarını başlangıçtaki ikili bayt dizisini inceleyerek tanımlar:
HEX İMZASI (OFSET 0):
Plain TextASCII GÖSTERİMİ: ASCII / UTF-8
Standardizasyon: RFC 4180 / IETF
Teknik Özellikler
| Konteyner Mimarisi | Delimited flat text file representing tabular data rows and columns |
| Sıkıştırma | Gzip / Deflate achieves 85%-95% compression on repetitive tabular records |
| Bayt Düzeni (Endianness) | UTF-8 text stream (optional UTF-8 BOM EF BB BF used by Excel) |
| Renk Uzayları | Not applicable |
| Kanallar ve Yapı | Row records delimited by CRLF with columns delimited by commas |
| Maksimum Boyutlar | Unbounded; streamable to gigabytes without loading entire file in memory |
| Şeffaflık | Not applicable |
| Akış ve Aşamalı (Streaming & Progressive) | Native line-by-line stream processing supported by all data pipelines |
Teknik Karşılaştırma Matrisi: CSV ve Rakipleri
| Teknik Nitelik | CSV (Güncel) | 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 |
Yaygın Bozulma Modları ve Hex Kurtarma Kılavuzu
⚠️ Columns shift to the right or row counts do not match.
Kök Neden: A text field containing an unescaped comma without surrounding quotation marks.
Kurtarma: 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.
Kök Neden: Excel opened a UTF-8 CSV assuming the legacy Windows ANSI/CP1252 character encoding.
Kurtarma: Prepend the 3-byte UTF-8 Byte Order Mark (0xEF 0xBB 0xBF) to the beginning of the file.
Güvenlik Analizi ve Ayrıştırıcı Saldırı Vektörleri
CSV files open directly in spreadsheet software like Excel and Google Sheets, exposing users to Formula Injection (CSV Injection) attacks.
Bilinen Saldırı Vektörleri
- 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.
Savunmacı En İyi Uygulamalar: 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.
Tarihsel Kökenler ve Kilometre Taşları
Temel Avantajlar ve Artılar
- 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.
Teknik Kısıtlamalar ve Eksiler
- 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.
İlginç Teknik Bilgiler
- 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.
Sıkça Sorulan Teknik Sorular
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.
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