Base64 Encoder / Decoder
Instantly encode or decode text with Base64 — fully in your browser, nothing sent to any server.
How to Use the Base64 Encoder / Decoder
- 1Select the Encode tab to convert plain text to Base64, or the Decode tab to reverse the process.
- 2Paste or type your text into the Input field. The result appears instantly in the Output field.
- 3Toggle URL-safe Base64 if you need the output to be safe for use in URLs or filenames (replaces + with - and / with _).
- 4Click Copy Output to copy the result to your clipboard with a single click.
- 5Use Clear to reset the input and start fresh.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is widely used to transmit binary data over text-only channels such as email, JSON payloads, and HTML data URIs.
Is Base64 the same as encryption?
No. Base64 is an encoding scheme, not an encryption algorithm. It does not provide any security or confidentiality. Anyone who has the Base64 string can trivially decode it back to the original data.
What is URL-safe Base64?
Standard Base64 uses the characters + and / which have special meaning in URLs. URL-safe Base64 replaces + with - and / with _ to make the encoded string safe to include in query strings and file names without percent-encoding.
Why do I get 'Invalid Base64' error?
The input must consist only of valid Base64 characters (A–Z, a–z, 0–9, +, /, =). Common mistakes include extra whitespace, line breaks inserted by copy/paste, or missing padding characters (=). Try trimming the string first.
Does this tool send my data to a server?
No. All encoding and decoding happens entirely inside your browser using the native btoa() and atob() JavaScript functions combined with the TextEncoder/TextDecoder Web APIs. Your data never leaves your device.