Base64 Encoder & Decoder Online
Encode text or files into Base64, decode Base64 back to readable text or a file, and use URL-safe Base64 — directly in your browser.
Base64 tool features
Text encoding and decoding
Encode text or files into Base64, decode Base64 back to readable text or a file, and use URL-safe Base64 — directly in your browser.
URL-safe Base64
Yes. Enable the URL-safe option when the Base64 value uses hyphens and underscores.
File encoding and decoding
This implementation processes selected files in your browser. It does not include a server-side upload endpoint.
Line-by-line decoding
Decode each line separately
Live text conversion
Live mode
Copy and download controls
Copy result / Download result
Base64 encoding explained
Base64 represents groups of bytes using a 64-character alphabet. In the standard form, the alphabet uses letters, numbers, + and /, with = used as padding when needed. URL-safe Base64 replaces + and / with - and _.
Because Base64 expands data, the encoded output is typically larger than the original binary data. It is useful for transporting data through text-oriented formats, but it is not compression.
Security note: Anyone who can see a Base64 value can generally decode it. Do not treat Base64 as a password, encryption method or secure secret-storage mechanism.
Frequently asked questions
Is this Base64 tool free?
Yes. The tool is designed as a free browser-based utility.
Are my files uploaded to a server?
This implementation processes selected files in your browser. It does not include a server-side upload endpoint.
Can I decode URL-safe Base64?
Yes. Enable the URL-safe option when the Base64 value uses hyphens and underscores.
Is Base64 encryption?
No. Base64 is an encoding scheme. It does not provide confidentiality or password protection.
Why does Base64 make data larger?
Base64 represents binary data using text characters and adds overhead. This is a trade-off for compatibility with text-based systems.