What's the difference between Base64 and URL encoding?

Base64 turns arbitrary bytes into 64 printable characters (A-Z, a-z, 0-9, +, /) so binary data can travel inside text-only fields like JSON or email. URL encoding only escapes reserved characters, spaces become %20, slashes become %2F, so a string is safe inside a URL. A PDF in a request body gets Base64'd; a search query with spaces gets URL-encoded. Use base64-encode-decode for the first and url-encode-decode for the second.

Is Base64 a form of encryption?

No, Base64 is encoding, not encryption. Anyone can decode a Base64 string with the public alphabet. The point is to make binary data survive text transports, not to hide it. If a dev response contains a 'Base64-encrypted' password, that's a bug, not a feature. For real secrets, use password hashing or AES, the Security Tools category covers bcrypt, AES, and random password generators.

How big does Base64 make a file?

Base64 grows the payload by roughly 33%, every 3 bytes of input becomes 4 output characters, plus padding. A 300 KB PNG encoded as a data URI lands near 400 KB. Fine for small assets under 4 KB inlined in CSS, painful for photos over 50 KB. image-to-base64 shows the encoded size upfront, so the size trade-off is visible before shipping.

When should I URL-encode vs. HTML-entity-encode?

URL-encode when the string lives in a URL, a query value, path segment, or form body. HTML-entity-encode when the string lives in rendered HTML, inside a , attribute, or template. A user comment on a page needs entity escaping so can't run; a search term dropped into ?q=... needs URL encoding so & doesn't split the query.

Why does Base64 sometimes end with = or ==?

The = characters are padding. Base64 works in 3-byte input groups; when the input isn't a multiple of 3, = pads the output to a multiple of 4. One leftover byte yields ==, two leftover bytes yield =. URL-safe Base64 (used in JWTs) strips the padding, re-add = until the total length divides by 4 if a decoder rejects the string.

Can I decode a string without knowing which encoding it uses?

Usually, yes, by shape. Strings ending in = with only A-Z/a-z/0-9/+// characters are Base64. Strings full of %XX sequences are URL-encoded. Strings with & or &#NNN; are HTML entities. If the first pass returns gibberish, chain, some payloads are Base64-encoded JSON that was itself URL-encoded, so one pass of each gets to readable text.

Binary & Encoding Tools

Encoding tools convert text between the formats APIs, browsers, and databases use, Base64 for JSON payloads, percent-encoding for URL query strings, HTML entities for safe markup, hex and binary for debugging protocol dumps. A backend developer chasing a broken webhook can paste a Base64 response body, decode it to UTF-8, and spot the malformed field in seconds.

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