Question 1

What is Base64 encoding?

Accepted Answer

Base64 is a way of representing binary data using only 64 safe, printable characters (A–Z, a–z, 0–9, + and /). It's used to embed data in places that only handle text — email attachments, data URLs, JSON payloads, JWT tokens, and HTTP basic authentication headers.

Question 2

How do I decode a Base64 string?

Accepted Answer

Switch to Decode mode, paste the Base64 string, and the decoded text appears instantly. If the input isn't valid Base64 (wrong characters or broken padding), the tool tells you instead of producing garbage output.

Question 3

Is Base64 encryption?

Accepted Answer

No. Base64 is encoding, not encryption — it provides zero security. Anyone can decode a Base64 string with no key or password. Never use Base64 to hide passwords or secrets; use proper encryption instead.

Question 4

Why do Base64 strings end with = signs?

Accepted Answer

The = characters are padding. Base64 encodes data in groups of 3 bytes into 4 characters, so when the input length isn't a multiple of 3, one or two = signs pad the output to a multiple of 4. They carry no data and some decoders accept input without them.

Question 5

Does Base64 work with Unicode, emoji, and special characters?

Accepted Answer

Yes — this tool encodes text as UTF-8 before converting to Base64, so accented characters, non-Latin scripts, and emoji all round-trip correctly. Naive JavaScript btoa() calls fail on these characters; this tool handles them properly.

Question 6

What is URL-safe Base64?

Accepted Answer

Standard Base64 uses + and /, which have special meanings in URLs. URL-safe Base64 (used in JWTs and web tokens) replaces + with - and / with _, and usually drops the = padding. Toggle the URL-safe option above to encode or decode this variant.

Base64 Encode & Decode

BASE64 ENCODE & DECODE FAQ