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Base64 Encoder vs URL Encoder

Base64 vs URL encoding: different encoding schemes for different purposes. Learn when to use each and avoid common mistakes.

Encoders & Decoders

Base64 Encoder & Decoder

Encode and decode Base64 strings instantly

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URL Encoder & Decoder

Encode and decode URL components safely

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Not interchangeable

Base64 and URL encoding serve different purposes and produce different output for the same input. Base64 represents binary or text data as ASCII-safe characters — common in JWTs, data URIs, and email attachments. URL encoding (percent-encoding) escapes reserved characters in URLs and query strings.

When to use Base64

Use Base64 when you need to embed binary data in text formats: image data URIs, basic auth headers, or decoding JWT payload segments. The Base64 tool handles UTF-8 text correctly before encoding.

When to use URL encoding

Use URL encoding when building query strings, encoding path segments, or decoding URLs copied from browser address bars. Spaces become %20, ampersands become %26, and Unicode characters get percent-encoded byte sequences.

Common mistake

Do not URL-encode a string when you need Base64, or vice versa. JWT segments look like Base64 (with URL-safe variants); query parameters need percent-encoding. Using the wrong scheme produces garbled output or broken URLs.

Frequently asked questions

Is Base64 the same as URL encoding?
No. Base64 encodes data into A–Z, a–z, 0–9, +, / (with = padding). URL encoding replaces special characters with %XX hex codes.
Can I decode a JWT with the URL encoder?
JWTs use Base64URL encoding, which is a variant of Base64. Use the Base64 decoder for JWT payload inspection.

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