Understanding Base64 Encoding: When to Inline Assets and When to Avoid It

Base64 translates 8-bit binary bytes into a set of 64 printable ASCII characters. Because every 3 binary bytes (24 bits) are mapped into 4 ASCII characters (also 24 bits, with 6 bits utilized per character), Base64 encoding consistently increases raw byte volume by roughly 33%.

However, for tiny SVG icons (under 1 KB) or critical placeholder blur hashes, inlining via Data URIs saves an entire HTTP round-trip request. Test conversions with our Base64 Encoder/Decoder.