Does Base64 encoding make data secure?

No. Base64 is encoding, not encryption. Anyone with the Base64 string can decode it instantly. Use proper encryption or hashing for security.

How much larger is Base64 output?

Base64 output is approximately 33% larger than the original. Every 3 bytes of input becomes 4 Base64 characters.

What is the difference between Base64 and Base64URL?

Base64URL replaces + and / with - and _ for URL safety. JWTs use Base64URL encoding.

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Base64 Encoder / Decoder

Encode text or files to Base64 and decode Base64 strings back to plain text. Everything runs locally in your browser — nothing is uploaded to any server.

Input

Output

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Drop a file or click to browse

Supports any file type. Max 10 MB. File is read locally — never uploaded.

How to use

Pick Text or File mode and paste or drop your input.
Click Encode or Decode — the result appears below instantly.
Copy the output, swap input/output to round-trip, or grab a full data URL for file mode.

FAQ

No. Base64 is just encoding — anyone with the string can decode it. Use real encryption (AES) or password hashing (bcrypt, Argon2) for security.

Roughly 33% larger than the original. Three bytes of input become four Base64 characters, plus padding to the nearest multiple of four.

Base64URL swaps + and / for - and _ so the result is safe to drop into URLs and HTTP headers. JWTs use Base64URL.