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A fixed-width Unicode encoding where each code point is represented by 32 bits.
DESCRIPTION
UTF-32 (also known as UCS-4) encodes each Unicode scalar value as a 32-bit integer, providing constant-time indexing and simplicity. It is less space-efficient than UTF-8/UTF-16 for most text but avoids surrogate pairs and variable-length decoding. UTF-32 can be stored in big-endian or little-endian forms and may include a BOM to indicate endianness. It’s used in internal representations and APIs where simplicity outweighs storage costs.
ALTERNATIVE DEFINITIONS
Unicode Consortium
UTF-32 is a simple format that encodes each Unicode scalar value as 32 bits.
Highlights fixed-width 32-bit encoding for each scalar value.
Python Documentation
UTF-32 uses 4 bytes per code point and is a fixed-length encoding.
Emphasizes fixed-length and 4-byte representation in Python context.
ICU (International Components for Unicode)
UTF-32 represents each Unicode code point with 32 bits, simplifying indexing at the cost of memory.
Notes simplicity of indexing versus memory overhead trade-off.
RELATED TERMS
Unicode Code Point UCS-4 BOM Endianness
COMPETING TERMS
KNOWLEDGE AREAS
Data Integration & Interoperability Programming Languages Data Storage & Operations
TARGET AUDIENCE
Software Developer Data Engineer Full Stack Developer
EXTERNAL SOURCES
- Wikipedia - UTF-32
- Unicode Consortium - Official UTF and BOM guidance
- Python - Unicode HOWTO for developers
- ICU - Unicode library and design notes
TOP QUESTIONS
When is UTF-32 preferable over UTF-8 or UTF-16?
When constant-time indexing and simplicity are more important than storage efficiency, such as certain internal representations.
Category: Opinion
Does UTF-32 require surrogate pairs?
No. Each code point is represented directly, avoiding surrogate pairs used in UTF-16.
Category: Overview
What are the storage trade-offs of UTF-32?
UTF-32 consumes more memory, typically 4 bytes per character, which is inefficient for common text.
Category: Risk
How does endianness affect UTF-32?
UTF-32 can be big-endian or little-endian; a BOM may indicate byte order.
Category: Requirements
Is UTF-32 widely used in file formats?
Less common than UTF-8; usage is limited due to size overhead.
Category: Misunderstanding
How does UTF-32 handle non-BMP characters?
All code points, including non-BMP, map directly to a single 32-bit value.
Category: Overview
Can UTF-32 be converted to other encodings?
Yes, conversion libraries and APIs handle transcoding among UTF-8, UTF-16, and UTF-32.
Category: Interoperability
Does UTF-32 have a BOM?
It may include a BOM to indicate endianness for UTF-32BE or UTF-32LE.
Category: Specification
What systems expose UTF-32 APIs?
Some programming languages, libraries, and OS APIs provide UTF-32 code point interfaces.
Category: Platform