Free online Base64 encoder and decoder tool. Encode text to Base64 or decode Base64 back to plain text instantly. Supports UTF-8, URL-safe encoding, MIME, and file data URIs. Essential for web developers handling API tokens, authentication headers, and embedded resources. 100% browser-based.
100% browser-based — your data never leaves your device
Encode or decode Base64 text instantly in your browser.
Select Encode to convert text to Base64 or Decode to convert Base64 back to text.
Type or paste your text into the input area.
Click Encode or Decode, then copy the result to your clipboard.
Ctrl+Enter to convert
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Base64 Encode/Decode is a free online text tool that encode or decode base64 text instantly in your browser. It works entirely in your browser — no downloads, no installations, and no server uploads required. content writers, developers, technical writers use Base64 Encode/Decode when they need a fast, privacy-respecting way to process text data without installing additional software. It supports capabilities such as bidirectional, utf-8 support, url-safe mode. Additional features include file support. Common use cases include encoding binary data for inclusion in json or xml payloads, decoding base64-encoded api tokens and authentication headers, embedding small images as base64 data uris in html or css. All processing happens locally using modern browser APIs, which means your data never leaves your device. This makes Base64 Encode/Decode ideal for working with sensitive data, proprietary code, or any situation where privacy matters.
Base64 Encode/Decode is a free online text tool that helps you encode or decode base64 text instantly in your browser. Key capabilities include bidirectional, utf-8 support, url-safe mode. All processing is done locally in your browser — no data is uploaded, stored, or shared with any server. There are no sign-ups, no file size limits, and no hidden charges. It is commonly used to encoding binary data for inclusion in json or xml payloads.
Select Encode to convert text to Base64 or Decode to convert Base64 back to text.
Type or paste your text into the input area.
Click Encode or Decode, then copy the result to your clipboard.
| Category | Details |
|---|---|
| Input Limits | Maximum input length: Browser memory bound |
| Encoding support: UTF-8, UTF-16, ASCII, ISO-8859-1, Windows-1252 | |
| Supported Formats | Plain text, UTF-8, ASCII, Unicode, Percent-encoding (RFC 3986) |
| Browser Engine |
|
All operations run entirely in your browser using built-in Text APIs. No server uploads, no data storage, and no third-party requests.
Base64 Encode/Decode is ideal when you need to encoding binary data for inclusion in json or xml payloads without installing software or uploading data to a server. Since everything runs in your browser, there is no setup time and no risk of your data being stored on external servers. For for advanced text manipulation within an IDE, consider using VS Code. For for batch text processing on servers, sed/awk (command-line) may be a better fit. Base64 Encode/Decode fills the gap between heavyweight desktop tools and insecure online services that require uploading your data.
No. Base64 Encode/Decode processes everything entirely in your browser using JavaScript. Nothing you type, paste, or upload is ever transmitted to any server. Your data never leaves your device.
Base64 is a binary-to-text encoding that represents binary data in an ASCII string format using 64 characters.
Yes. All encoding/decoding happens locally in your browser — nothing is sent to any server.
Encode text to Base64 or decode Base64 back to plain text with a single toggle.
Handles Unicode and special characters with proper UTF-8 encoding.
Option to use URL-safe Base64 encoding (replacing +/ with -_).
Encode small files or images to Base64 data URIs.
Base64 Encode/Decode is useful in a variety of scenarios across different workflows:
Encoding binary data for inclusion in JSON or XML payloads
Decoding Base64-encoded API tokens and authentication headers
Embedding small images as Base64 data URIs in HTML or CSS
Base64 encoding increases data size by approximately 33%. For large payloads, consider using binary formats instead.
When including Base64 in URLs, use the URL-safe variant where + is replaced with - and / with _ to avoid encoding issues.
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