Effloow / Tools / Base64 Encoder & Decoder
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Base64 Encoder & Decoder

Encode text or files to Base64, or decode Base64 back to text. Supports URL-safe variant. Everything runs in your browser — nothing is sent to any server.

Text Input

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Base64 Output

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What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data as a sequence of printable ASCII characters. It is widely used in web development and data transmission.

Common Use Cases

  • Email attachments — MIME encoding for sending binary files over text-based email protocols
  • Data URIs — Embedding images directly in HTML or CSS using data: URLs
  • API payloads — Transmitting binary data within JSON payloads
  • Authentication — HTTP Basic Authentication encodes credentials in Base64
  • Cookies & URLs — Storing complex data structures in cookies or query parameters

Standard vs URL-safe Base64

Standard Base64 uses A-Z, a-z, 0-9, +, and / with = padding. URL-safe Base64 replaces + with - and / with _, and removes padding. This makes it safe for URLs and filenames.