Base64 Encoder/Decoder
Encode and decode text with Base64.
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Introduction
Base64 Encoder/Decoder — Encode and decode text with Base64. Enter Mode, Text to get an instant, accurate result.
Formula
Base64 maps every 3 bytes of input to 4 printable ASCII characters using a 64-character alphabet (A–Z, a–z, 0–9, +, /).
Step-by-step
- Enter the Mode.
- Enter the Text.
- Click Calculate to see your result instantly.
Real-world example
Example: With Mode = encode, the Base64 Encoder/Decoder gives Encoded: SGVsbG8sIENhbGNIdWIh.
Frequently Asked Questions
Is Base64 encryption?
No — it's an encoding, not encryption. It provides no confidentiality, only a way to represent binary data as text.
What happens if I try to decode invalid Base64?
The decode will fail since the input doesn't match valid Base64 structure.
What inputs does the Base64 Encoder/Decoder need?
You'll need to provide: Mode, Text. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Base64 Encoder/Decoder?
The Base64 Encoder/Decoder applies the formula exactly as calculated — Base64 maps every 3 bytes of input to 4 printable ASCII characters using a 64-character alphabet (A–Z, a–z, 0–9, +, /). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Base64 Encoder/Decoder free to use?
Yes, the Base64 Encoder/Decoder is completely free, requires no signup, and runs instantly in your browser.
About the Base64 Encoder/Decoder
The Base64 Encoder/Decoder uses a real, verifiable formula — Base64 maps every 3 bytes of input to 4 printable ASCII characters using a 64-character alphabet (A–Z, a–z, 0–9, +, /). — so results are accurate every time, not an approximation.