Universal file formats refer to those readable across nearly all operating systems and devices without specialized software. "Universally supported" typically means formats with open specifications, minimal complexity, and widespread adoption. Common examples include plain text files (TXT), basic image formats (PNG, JPEG), and simple data formats (CSV). These function fundamentally differently than proprietary or complex formats (e.g., specific CAD formats or raw photo files) by using widely understood encoding.

Text files (TXT) are used for configuration files across all software platforms and documentation universally accessible on any device. PNG images are regularly used for logos and web graphics due to their guaranteed viewability across browsers and operating systems. CSV files are an industry standard for exchanging tabular data between different database systems, spreadsheets (like Microsoft Excel or Google Sheets), and custom applications.

The key advantage is maximum compatibility, ensuring information sharing without access barriers. The main limitation is functional simplicity: these formats lack advanced features like layers, complex formatting, encryption, or animations. Future developments focus on newer open standards (like WebP for images) balancing wider support with richer capabilities, but universal adoption takes significant time.