JPG vs XLS
A detailed comparison of JPEG Image and Excel Spreadsheet (Legacy) — file size, quality, compatibility, and which format to choose for your workflow.
JPEG Image
Raster & Vector ImagesJPEG is the most widely used lossy image format on the web. It achieves small file sizes through adjustable compression, making it ideal for photographs and complex images where some quality loss is acceptable.
About JPG filesExcel Spreadsheet (Legacy)
Spreadsheets & DataXLS is the legacy binary format for Microsoft Excel 97-2003 spreadsheets. While superseded by XLSX, it remains common in archived data and older business systems.
About XLS filesStrengths Comparison
JPG Strengths
- Excellent compression ratio for photographs (10:1 or better without visible quality loss).
- Universal support — every camera, phone, OS, and browser reads JPEG natively.
- Adjustable quality setting balances file size against visual fidelity.
- Embeds EXIF metadata (camera model, GPS, exposure) automatically.
- Progressive rendering for graceful loading over slow networks.
XLS Strengths
- Universal legacy — every Excel since 1997 opens .xls natively.
- Binary format is compact and loads quickly.
- Full support for formulas, charts, pivots, and VBA macros.
- Deep integration with every accounting and ERP system of the 1990s-2000s.
Limitations
JPG Limitations
- Lossy — every save degrades the image further (generation loss).
- No transparency channel (use PNG or WebP for that).
- Visible compression artifacts on text, sharp edges, and flat colors.
- Limited to 8 bits per channel — poor for HDR or print work.
- Baseline JPEG tops out at 65,535 × 65,535 pixels.
XLS Limitations
- Row/column limits are ~64× smaller than modern XLSX.
- Macro-enabled variants are a notorious malware vector.
- Binary corruption often means total data loss.
- Cannot represent modern Excel features (dynamic arrays, LAMBDA, structured references).
- Microsoft stopped evolving the format in 2007.
Technical Specifications
| Specification | JPG | XLS |
|---|---|---|
| MIME type | image/jpeg | application/vnd.ms-excel |
| Compression | Lossy — Discrete Cosine Transform + quantization + Huffman coding | — |
| Color depth | 8 bits per channel (24-bit RGB or 8-bit grayscale) | — |
| Max dimensions | 65,535 × 65,535 pixels (baseline) | — |
| Transparency | Not supported | — |
| Typical quality | 75–90 for web, 95+ for print | — |
| Max rows | — | 65 536 (Excel 97-2003) |
| Max columns | — | 256 (A to IV) |
| Container | — | OLE Compound File |
| Successor | — | .xlsx (2007) |
Typical File Sizes
JPG
- Phone photo (12 MP, quality 85) 2–5 MB
- Web thumbnail (400px) 20–60 KB
- Full-page magazine photo 500 KB – 2 MB
- Social-media square (1080×1080) 100–400 KB
XLS
- Simple budget (1 sheet) 30-60 KB
- Multi-sheet financial model 500 KB - 5 MB
- Data export with 65 000 rows 5-20 MB
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Frequently Asked Questions
JPG (JPEG) is the most widely used image format, developed by the Joint Photographic Experts Group in 1992. It uses lossy compression to achieve small file sizes, making it the standard for digital photography, web images, and social media.
XLS is the legacy Microsoft Excel binary format used from 1987 to 2007, storing worksheets, formulas, charts, and VBA macros. Excel 97 switched XLS to the OLE Compound File container. It was replaced as default by XLSX in Office 2007 but survives in legacy financial systems and older government databases.
JPG files can be opened by virtually any image viewer or editor, including Windows Photos, macOS Preview, Adobe Photoshop, GIMP, and all web browsers.
XLS files open in every Excel version since 1997, Google Sheets (free), LibreOffice Calc (free), Apple Numbers, and most online viewers. The maximum worksheet size in XLS is 65 536 rows × 256 columns — modern XLSX raises those limits dramatically.
Use JPG for photographs and complex images where small file size matters. Use PNG when you need transparency, sharp text, or lossless quality such as logos, screenshots, and graphics with flat colors.
Use KaijuConverter's XLS-to-XLSX converter, or open the .xls in Excel and use Save As → Excel Workbook (.xlsx). LibreOffice and Google Sheets also convert on save. Modern XLSX supports 1 048 576 rows per sheet — 16× more than XLS.