Base64 is a binary-to-text encoding scheme that represents binary data using an ASCII character set of 64 printable characters (A-Z, a-z, 0-9, +, /). It is widely used to embed images, credentials, or attachments into text-based protocols like HTTP, JSON, and MIME email without corruption.
SECURITY & CRYPTO·Client-Side (100% Private)
Base64 Encoder / Decoder
Encode plain text or binary files to Base64 format and decode Base64 data strings with URL-safe support.
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Zero Server Storage Guarantee
Data entered into this tool is processed 100% locally within your browser. Nothing is ever sent to or logged on any server.
FREQUENTLY ASKED QUESTIONS
Frequently Asked Questions about Base64 Encoder / Decoder
Quick answers to common questions about usage, conversion rules, privacy guarantees, and best practices.
What is Base64 encoding and why is it used?
Is Base64 encoding secure or equivalent to encryption?
No. Base64 is an encoding format, not an encryption method. Anyone who receives Base64 data can easily decode it back into plain text. It should never be used alone to secure sensitive passwords or confidential information.
Why is Base64 output approximately 33% larger than the original input?
Base64 represents every 3 bytes (24 bits) of binary input using 4 ASCII characters (32 bits). This 4:3 expansion ratio results in an approximate 33% overhead in payload size.
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