Base64 in C#: Convert.ToBase64String and FromBase64String
Encode and decode Base64 in C# using Convert.ToBase64String. Covers byte arrays, streams, URL-safe variants, and common encoding pitfalls in .NET.
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Tags: encoding, csharp, base64
Base64 in C#: Convert.ToBase64String and FromBase64String C# provides Base64 encoding through the class with and . Since .NET 5, there are also -based methods for allocation-free encoding of large data. This guide covers both, plus Base64URL, async file encoding, and the gotchas that catch developers off guard. Span<byte> API (.NET 5+) The methods allocate a new on every call. For performance-sensitive code (e.g., encoding many small values in a hot loop), use the overloads which let you work with stack-allocated or pre-allocated buffers. For decoding with : --- Base64URL encoding The .NET standard library doesn't include a Base64URL implementation, but in newer versions, and the manual approach, both work well: JWT decoding --- Async file encoding For encoding files, use async file I/O…
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