File Format Reference
Comprehensive technical guides for popular file formats. Understand the strengths, limitations, and best uses for each format.
Documents
Portable Document Format
CompressionLossless
TransparencyNo
Best for: Preserving document layout, Printing
DOCX
Microsoft Word Open XML Document
CompressionLossless
TransparencyNo
Best for: Editable documents, Word processing
XLSX
Microsoft Excel Open XML Spreadsheet
CompressionLossless
TransparencyNo
Best for: Spreadsheets with formulas, Data analysis
Images
JPG
Joint Photographic Experts Group
CompressionLossy
TransparencyNo
Best for: Photographs, Web images
PNG
Portable Network Graphics
CompressionLossless
TransparencyYes
Best for: Graphics with transparency, Screenshots
HEIC
High Efficiency Image Container
CompressionLossy
TransparencyYes
Best for: iPhone and iPad photos, High-quality photos with small file size
