Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 strings back to plain text. Supports standard and URL-safe Base64 with UTF-8 encoding. All processing runs locally — no data uploaded.

Base64 Encoder Decoder: Paste text to encode it to Base64, or paste a Base64 string to decode it back to plain text. Supports UTF-8 encoding. Copy the result with one click. Useful for API payloads, data URIs, and email encoding.

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Key Takeaways

Encodes any text to Base64 and decodes Base64 back to text
Base64 uses A–Z, a–z, 0–9, +, / and = for padding
Encoding increases size by approximately 33% (3 bytes → 4 characters)
Used in data URIs, email attachments (MIME), and API authentication headers
All encoding/decoding runs locally in your browser

What is Base64 Encoder Decoder?

Base64 Encoder Decoder — A Base64 Encoder/Decoder is a free tool that encodes text into Base64 format and decodes Base64 strings back into readable text.

Encode and decode Base64 online with this free tool. Paste plain text to encode it as Base64, or paste a Base64 string to decode it back to readable text. Supports both standard Base64 (A-Z, a-z, 0-9, +, /) and URL-safe Base64 (replaces + with - and / with _). Useful for API payload debugging, data URI creation, email encoding (MIME), JWT inspection, and embedding binary data in JSON or XML. All encoding and decoding runs locally in your browser — no data is sent to any server.

How to Use Base64 Encoder Decoder

1
Choose encode or decode mode.
2
Paste text or Base64 input into the editor.
3
Enable URL-safe handling when required.
4
Copy the output for your implementation workflow.

Key Features

Bi-directional Base64 conversion

URL-safe mode support

Fast copy workflow

Useful for API and token debugging

Browser-based utility

Use Cases

API request/response debugging

JWT-related base64url checks

Data URI generation and inspection

Encoding checks in integration tests

About Base64 Encoder Decoder

Base64 is a binary-to-text encoding scheme that converts data into ASCII characters for safe transport through text-based protocols. It is NOT encryption — anyone can decode Base64 without a key. Base64 is used in data URIs (embedding images in HTML/CSS), email attachments (MIME encoding), HTTP Basic authentication headers, JWT token segments, and API payloads that need to carry binary data as text. Standard Base64 uses A-Z, a-z, 0-9, +, / with = padding. URL-safe Base64 replaces + with - and / with _ to avoid conflicts in URLs and query strings. Encoding increases size by approximately 33% (every 3 bytes becomes 4 characters).

Frequently Asked Questions

What is Base64 encoding used for?: Base64 is used to encode binary data as ASCII text for transport through text-based protocols. Common uses: data URIs in HTML/CSS, email attachments (MIME), JWT token segments, HTTP Basic auth headers, and embedding binary data in JSON or XML.
Is Base64 the same as encryption?: No. Base64 is an encoding format, not encryption. Anyone can decode Base64 without a key. It provides no security — use proper encryption (AES, RSA) for confidential data.
What is URL-safe Base64?: URL-safe Base64 replaces + with - and / with _ to avoid characters that have special meaning in URLs. It is used in JWTs, URL query parameters, and file names. Some implementations also strip the = padding.
Why does Base64 increase file size?: Base64 converts every 3 bytes of data into 4 ASCII characters, resulting in approximately 33% size increase. This is the trade-off for being able to embed binary data in text formats.
Can I encode files to Base64?: Yes. The tool supports file encoding to Base64, which is useful for creating data URIs (e.g., data:image/png;base64,...) and embedding images in HTML or CSS.
Is this Base64 tool free?: Yes. Completely free, runs locally in your browser, and has no limits on encoding/decoding or registration requirements.

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Frequently Asked Questions

What is Base64 encoding used for?

Base64 is used to encode binary data as ASCII text for transport through text-based protocols. Common uses: data URIs in HTML/CSS, email attachments (MIME), JWT token segments, HTTP Basic auth headers, and embedding binary data in JSON or XML.

Is Base64 the same as encryption?

No. Base64 is an encoding format, not encryption. Anyone can decode Base64 without a key. It provides no security — use proper encryption (AES, RSA) for confidential data.

What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _ to avoid characters that have special meaning in URLs. It is used in JWTs, URL query parameters, and file names. Some implementations also strip the = padding.

Why does Base64 increase file size?

Base64 converts every 3 bytes of data into 4 ASCII characters, resulting in approximately 33% size increase. This is the trade-off for being able to embed binary data in text formats.

Can I encode files to Base64?

Yes. The tool supports file encoding to Base64, which is useful for creating data URIs (e.g., data:image/png;base64,...) and embedding images in HTML or CSS.

Is this Base64 tool free?

Yes. Completely free, runs locally in your browser, and has no limits on encoding/decoding or registration requirements.

Base64 Encoder & Decoder

Key Takeaways

What is Base64 Encoder Decoder?

How to Use Base64 Encoder Decoder

Key Features

Use Cases

About Base64 Encoder Decoder

Frequently Asked Questions

Base64 Encoder & Decoder