Base64 vs URL Encoding: What's the Difference?
Base64 and URL encoding both transform data into text, but they solve different problems. Base64 carries binary bytes; URL encoding escapes special characters inside a URL. This guide clarifies when each applies and how they differ.
What Is the Difference Between Base64 and URL Encoding?
Base64 is a binary-to-text encoding that turns arbitrary bytes into a compact ASCII alphabet. URL encoding (percent-encoding) replaces unsafe characters in a URL with %-sequences so the link stays valid.
Which One Preserves Binary Data?
Base64. It encodes images, files, and raw bytes into a text-safe string that survives text-only transports. URL encoding is not built to carry binary; it targets the character set allowed inside URLs.
How Do Their Character Sets and Sizes Differ?
Base64 uses A–Z, a–z, 0–9, +, /, and =, inflating data by about a third. URL encoding uses %XX hex escapes, which grow most inputs and only touches unsafe characters, leaving letters and digits unchanged.
When Should You Use Each Encoding?
Use Base64 for data URLs, email attachments, and binary payloads. Use URL encoding for query parameters and path segments. Switch between %20 and + styles and inspect the result with the URL encoder and the Base64 converter.