What is Base64 encoding?

Base64 is an encoding scheme that converts binary data (or any bytes) to ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It's used to safely transmit binary data in text-based systems like email, JSON, and HTTP headers.

When would I need to decode Base64?

Common use cases: decoding JWT tokens (which are Base64-encoded), reading API responses, decoding email attachments, and working with data URIs for images.

What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _ to make the encoded string safe to use in URLs without percent-encoding. Used in JWT tokens and many web APIs.

Can I encode images to Base64?

Yes — upload any image file and get its Base64 data URI, which you can embed directly in HTML or CSS without a separate image request.

All Tools

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Base64 Encoder / Decoder

Free to Use

Encode text or files to Base64, or decode Base64 strings back to text or downloadable files. Real-time conversion.

Plain Text / Input

Base64 Output

Output will appear here...

Frequently Asked Questions

Is this Base64 encoder free?›

Yes, completely free with no account or sign-up required. Encode and decode as much as you like.

What does Base64 encoding do?›

Base64 converts binary or text data into a string of 64 printable ASCII characters. It is the standard (RFC 4648) used to embed images in HTML/CSS, transmit data in JSON APIs, and encode email attachments in MIME format.

Can it handle files as well as text?›

Yes. You can upload any file and get its Base64 data URI output, useful for embedding images directly into HTML or CSS. When decoding, the tool can download the result as a binary file.

What are common use cases?›

Encoding images to embed in HTML emails, passing binary data through text-only channels like JSON or XML, storing small assets inline in CSS, and decoding Base64 payloads from API responses or JWT tokens.

Is my data private?›

Yes. Encoding and decoding both happen entirely in your browser using the built-in btoa/atob functions — your data is never sent to any server.

What Is Base64 Encoder & Decoder?

A Base64 encoder/decoder converts binary data (text, files, images) to the Base64 ASCII string format used in data URIs, email attachments (MIME), HTTP headers, and data transfer between systems that don't support binary. Formly's free Base64 tool handles both text-to-Base64 encoding and Base64-to-text decoding, plus file encoding for embedding images in HTML/CSS as data URIs.

Why Formly's Base64 Encoder & Decoder Is the Best Free Option

✓Text and file support — encode raw text, upload files, or decode Base64 strings.
✓Image to data URI — convert images to Base64 data URIs for embedding in HTML/CSS.
✓URL-safe Base64 option — encodes to URL-safe variant (replaces + with -, / with _).
✓Instant decode — paste any Base64 string and immediately see the decoded content.
✓Free and private — everything processed in browser.

Free Alternative to base64encode.org, CyberChef

→base64encode.org: External server processes your data. Formly is 100% in-browser.

→CyberChef: CyberChef is powerful but complex. Formly is focused and simpler for common Base64 tasks.

Who Uses Base64 Encoder & Decoder?

Web developers

Encode images to Base64 data URIs to embed in HTML without separate HTTP requests.

API developers

Encode/decode authentication tokens, API keys, and binary data transmitted via JSON.

DevOps engineers

Encode Kubernetes secrets, environment variables, and configuration files in Base64.

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Looking for a detailed guide? Read our in-depth tutorial on using Base64 Encoder & Decoder for professional results.

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