💻Developer Utilities

Base64 Encode & Decode
Online & Free

Convert plain text to Base64 or decode Base64 representations in real time. Safe UTF-8 handling with 100% in-browser privacy.

TEXT INPUT0 chars
BASE64 OUTPUT0 chars

How to Encode and Decode Base64

1

Select Mode

Choose between encoding plain strings or decoding an existing Base64 block.

2

Instant Local Transform

The browser computes the binary character table mapping with zero latency.

3

Copy Result

Grab the output with 1 click for use in source code, headers, or data URIs.

Multibyte UTF-8 & Emoji Accuracy

Standard browser implementations of Base64 like window.btoa() crash when encountering characters outside the Latin-1 range (ASCII 0-255), throwing errors on emojis, foreign alphabets, and mathematical symbols. FileConvert utilizes an advanced TextEncoder buffer pipeline to guarantee full UTF-8 byte stream fidelity without corrupted sequences.

Private Token & Credential Processing

Developers routinely handle bearer tokens, webhook payloads, and auth headers that must be decoded for inspection. By executing 100% client-side in your local sandbox, you can decode credentials with complete confidence that nothing is captured in server access logs.

Frequently Asked Questions

Does this tool support emojis and special UTF-8 characters?

Yes. Unlike primitive btoa/atob implementations that throw an InvalidCharacterError on Unicode, this tool encodes strings via standard TextEncoder and TextDecoder, ensuring full UTF-8 and emoji fidelity.

Are my decoded strings sent to your servers?

No. All encoding and decoding operations execute 100% locally inside your browser memory. Your API keys, tokens, and payloads are never transmitted.

What is Base64 encoding typically used for?

Base64 represents binary data in an ASCII string format. It is widely used in HTTP Basic Auth headers, embedding inline images in HTML/CSS, and transferring binary assets across text-only protocols.

Can I decode Base64 data with whitespace or line breaks?

Yes. The decoder automatically sanitizes standard whitespace, tab characters, and newlines before parsing the Base64 sequence.

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