UtilityKit
AvailableBrowser-OnlyText

Base64 Encoder & Decoder

Encode and decode Unicode text, UTF-8 strings, and files to and from Base64 format.

Source Text / Unicode
39 chars
Base64 Result
0 chars
Full UTF-8 Unicode Support

Standard browser Base64 functions fail when encoding emojis or non-Latin text. UtilityKit utilizes modern UTF-8 byte encoding with TextEncoder and TextDecoder to safely encode and decode any language without character corruption.

About Base64 Encoder & Decoder

Robust online Base64 encoder and decoder with full UTF-8 Unicode support. Handles emojis, international languages, and URL-safe Base64 with clear error diagnostics for corrupted strings.

Accepted Input:Plain text, Unicode UTF-8 string, or Base64 payload
Output Result:Encoded Base64 string or decoded UTF-8 Unicode text
Processing model:Encoding and decoding occur entirely in memory inside your browser. No payload data touches any server.

How It Works

1Step 1

Select 'Encode' to turn text into Base64, or 'Decode' to convert Base64 back into plain text.

2Step 2

Type or paste your content, or upload a local file.

3Step 3

Toggle URL-Safe mode if you need Base64 for URL parameters, and copy or download the result.

Common Use Cases

Encoding binary assets, SVG icons, and small images as inline Data URIs in CSS and HTML.
Debugging JWT tokens, basic authorization headers, and API request payloads.
Safely transmitting non-ASCII or multi-byte international text across legacy protocols.

Frequently Asked Questions

Quick answers to common questions for users and search assistants

Why do standard Base64 tools fail on emojis and accents?
Standard browser btoa/atob APIs only support 8-bit Latin1 characters. UtilityKit converts Unicode into multi-byte UTF-8 bytes first using TextEncoder, ensuring emojis and non-Latin scripts work flawlessly.
What is URL-safe Base64?
Standard Base64 contains '+' and '/' characters which have special meaning in URLs. URL-safe Base64 substitutes '-' and '_' and removes '=' padding.

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