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Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 strings — instantly, privately.

100% in-browser — no data sent anywhere

URL-safe charset

76-char line wrap

Plain Text Input

0 chars

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Base64 Output

0 chars

What is Base64?

Base64 is an encoding scheme that converts binary data into a sequence of printable ASCII characters. It uses a set of 64 characters — A–Z, a–z, 0–9, plus + and / (or - and _ in the URL-safe variant) — to represent any data safely across systems that only handle text.

The name comes from the fact that every 3 bytes of input become exactly 4 Base64 characters, and output is padded with = signs to make the length a multiple of 4. It is not encryption — it is purely an encoding format and can be decoded by anyone instantly.

URL-safe Base64 replaces + with - and / with _, making it safe to include in URLs and filenames without percent-encoding.

Common uses of Base64

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Web APIs & Auth

HTTP Basic Auth headers, JWT tokens, and OAuth secrets are Base64-encoded.

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Azure & AWS

Cloud init scripts, Key Vault secrets, and ARM template parameters are often Base64-encoded.

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Inline Images

Images embedded in HTML, CSS, or JSON payloads use Base64 data URIs.

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Email Attachments

The MIME standard uses Base64 to encode attachments in plain-text email protocols.

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SSH & TLS Keys

Public/private keys and certificates (PEM format) are Base64-encoded binary data.

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Config & Secrets

Kubernetes secrets, Docker configs, and .env files frequently use Base64 values.