— Encoders & generators

Base64 Encode / Decode

Convert text to and from Base64 — UTF-8 safe, with an optional URL-safe variant and instant copy, all in your browser.

— What it does

Base64 Encode / Decode is a free tool that converts text to Base64 and back. It is UTF-8 safe, so emoji and accented characters round-trip correctly, and it supports the URL-safe variant used in tokens and query strings. Paste your input, pick encode or decode, and copy the result — everything runs locally in your browser.

  • UTF-8 safe encoding and decoding, so non-ASCII characters survive the round trip.
  • Optional URL-safe Base64 (− and _ instead of + and /, padding stripped).
  • Live conversion with one-click copy and a clear error on invalid Base64.
  • Runs entirely in your browser — nothing you enter is ever uploaded.

How to use it

1

Choose a mode

Switch between Encode and Decode at the top of the tool.

2

Paste your input

Enter plain text to encode, or a Base64 string to decode, into the input box.

3

Copy the result

The output updates as you type. Toggle URL-safe if you need the token-friendly variant, then copy it.

Frequently asked

Is my input uploaded anywhere?
No. Encoding and decoding run entirely in your browser with JavaScript. Nothing you type is sent to a server or stored, so it is safe for tokens and private data.
Does it handle emoji and accented characters?
Yes. The tool is UTF-8 safe: it encodes text through TextEncoder before Base64 and decodes back through TextDecoder, so emoji, accents, and other non-ASCII characters round-trip correctly.
What is URL-safe Base64?
URL-safe Base64 replaces + with − and / with _ and removes = padding, so the result can be used in URLs, filenames, and JWTs without escaping. Toggle it on to produce or read that variant.
Why do I get an error when decoding?
A decode error means the input is not valid Base64 — for example it has stray spaces, illegal characters, or the wrong length. Fix or re-paste the string and the error clears.

Related tools

URL Encode / Decode

Percent-encode text for safe use in URLs and query strings, or decode an encoded URL back to readable text — live, in your browser.

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HTML Entity Encode / Decode

Escape special characters into HTML entities to display code safely, or decode entities back to plain text — live, in your browser.

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JWT Decoder

Paste a JSON Web Token to read its header and payload as formatted JSON, with expiry and timestamps decoded — all in your browser.

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← All free tools

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