Is this Base64 encoder free to use?

Yes, our Base64 encoder/decoder is completely free with no signup required. There are no usage limits. All encoding and decoding happens in your browser - your data never leaves your device and is never stored on any server.

What's the difference between encode and decode?

Encoding converts regular text or binary data INTO Base64 format. Decoding converts Base64 text BACK to its original form. For example, 'Hello' encodes to 'SGVsbG8=' and 'SGVsbG8=' decodes back to 'Hello'.

Why does Base64 make data larger?

Base64 increases data size by approximately 33%. This is because it represents 3 bytes of data using 4 ASCII characters. While less efficient for storage, it ensures safe transmission through text-only channels like email or JSON.

Is Base64 encryption?

No, Base64 is NOT encryption - it's encoding. Anyone can decode Base64 without a key. It's designed for data transmission, not security. Never use Base64 to protect sensitive information. Use proper encryption (AES, RSA) for security.

What is a Base64 data URI?

A data URI embeds Base64-encoded data directly in HTML or CSS. Format: 'data:[mediatype];base64,[data]'. Example: 'data:image/png;base64,iVBORw0KGgo...' This eliminates extra HTTP requests but increases HTML file size.

Does Base64 support UTF-8 and Unicode?

Yes, our encoder fully supports UTF-8 and Unicode characters including emojis, Chinese, Arabic, and other non-ASCII text. We properly handle multi-byte characters that basic encoders often fail to process correctly.

Can I encode files and images to Base64?

Yes! You can upload any file (images, PDFs, documents) and convert it to Base64. This is useful for embedding images in HTML emails, storing binary data in JSON, or transmitting files through text-only APIs.

Base64 Encoder/Decoder

Encode and decode Base64 with file support and URL-safe mode

Text Input0 chars

Base64 Output0 chars

Base64 Settings

Live Mode

Encode/decode as you type

URL-Safe Mode

RFC 4648 compliant (-_ instead of +/)

Line Breaks

Add line breaks every 76 chars

About Base64:

Standard: Uses A-Z, a-z, 0-9, +, / and =
URL-Safe: Replaces + with - and / with _
Use cases: Embed images in HTML/CSS, encode binary data in JSON
File support: Drag & drop files up to 5MB

Quick Examples

Tool Capabilities

Client-Side (Browser)

Files never leave your device

Encode text to Base64
Decode Base64 to text
File to Base64 conversion
Base64 to file download
URL-safe Base64 encoding
Real-time encoding/decoding

Requires Server-Side

Not available — would need cloud processing

Large file encoding (500MB+)
Streaming encode/decode for binary data
Base64 in email (MIME) processing

Very large file encoding exceeds browser memory limits and requires server-side streaming.

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that converts any data into a safe ASCII string using 64 characters: A-Z, a-z, 0-9, + and /. The "64" refers to the 64-character alphabet used in the encoding. Base64 was designed to safely transmit binary data through systems that only handle text, like email (SMTP) or JSON APIs.

How It Works

Base64 takes 3 bytes (24 bits) of input and converts them to 4 ASCII characters (6 bits each). This is why Base64 increases size by ~33%. The = character pads the output when input isn't divisible by 3.

URL-Safe Variant

Standard Base64 uses + and / which need escaping in URLs. URL-safe Base64 (RFC 4648) replaces them with - and _, making it safe for URLs, filenames, and JWT tokens without additional encoding.

Common Use Cases for Base64

Embedding Images

Create data URIs to embed images directly in HTML/CSS without separate HTTP requests. Format: data:image/png;base64,... Reduces page requests for small icons and sprites.

API Data Transfer

Send binary files (images, PDFs, documents) through JSON/XML APIs that only support text. The receiving system decodes Base64 back to the original binary.

Email Attachments

MIME encoding uses Base64 to attach binary files to emails. The SMTP protocol only handles 7-bit ASCII, so attachments must be Base64 encoded.

JWT Tokens

JSON Web Tokens use Base64URL encoding for the header and payload sections. This allows tokens to be safely transmitted in HTTP headers and URLs.

Data URIs

Embed fonts, SVGs, and small files directly in CSS using data URIs. Eliminates additional HTTP requests but increases CSS file size.

Configuration Storage

Store binary data in text-based configs like YAML, JSON, or environment variables. Common for certificates, keys, and small binary assets.

Your Data Stays Private

Unlike most online Base64 tools, we never upload your data. All encoding and decoding happens entirely in your browser using JavaScript. Your text, files, and sensitive data never leave your device.

✓ No server uploads
✓ No data logging
✓ No cookies tracking
✓ Works offline after loading

Features

Encode & Decode

Convert text to Base64 or decode Base64 back to text instantly

File Support

Drag and drop files up to 5MB to encode them to Base64

URL-Safe Mode

RFC 4648 compliant encoding that replaces +/ with -_ for URLs

Live Mode

Real-time encoding as you type for instant feedback

UTF-8 Support

Full Unicode support including emojis and special characters

Copy & Download

One-click copy or download your encoded/decoded content

Bidirectional

Swap panels to quickly reverse encode/decode operations

100% Client-Side

All processing in your browser - data never leaves your device

How to Use

Enter text in the left panel to encode to Base64

Or paste Base64 in the right panel to decode to text

Enable Live Mode for real-time encoding as you type

Toggle URL-safe for URL-compatible Base64 output

Upload files by dragging them into the left panel

Use Swap to quickly exchange input and output

TL;DR - Free Base64 Encoder/Decoder

Encode and decode Base64 instantly in your browser. Convert text, files, and images to Base64 for data URIs, API payloads, and email attachments. URL-safe mode for JWTs and web apps. 100% client-side - your data never leaves your device.

Files up to 5MBURL-safe modeLive encode100% private

JumpTools vs Other Base64 Encoders

How does our Base64 tool compare to alternatives?

Feature	JumpTools	Base64Encode.org	Base64.guru
Price	Free	Free (ads)	Free (ads)
Privacy	100% client-side	Server-side	Server-side
URL-safe mode	Yes (RFC 4648)	Yes	Yes
File encoding	Up to 5MB	Limited	Up to 10MB
Live mode	Real-time as you type	Button click	Button click
Line breaks option	Yes (76 chars)	No	Yes
Data URIs	Auto-generate	Manual	Yes
Download output	Yes	Yes	Yes

Comparison as of February 2026. JumpTools processes all data locally in your browser.

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Loading tool...

Features

Encode & Decode

Convert text to Base64 or decode Base64 back to text instantly

File Support

Drag and drop files up to 5MB to encode them to Base64

URL-Safe Mode

RFC 4648 compliant encoding that replaces +/ with -_ for URLs

Live Mode

Real-time encoding as you type for instant feedback

UTF-8 Support

Full Unicode support including emojis and special characters

Copy & Download

One-click copy or download your encoded/decoded content

Bidirectional

Swap panels to quickly reverse encode/decode operations

100% Client-Side

All processing in your browser - data never leaves your device

Feature

JumpTools

Base64Encode.org

Base64.guru

Price

Free

Free (ads)

Privacy

100% client-side

Server-side

URL-safe mode

Yes (RFC 4648)

Yes

File encoding

Up to 5MB

Limited

Up to 10MB

Live mode

Real-time as you type

Button click

Line breaks option

Yes (76 chars)

Yes

Data URIs

Auto-generate

Manual

Yes

Download output

Yes

Base64 Encoder/Decoder

Tool Capabilities

Client-Side (Browser)

Requires Server-Side

How It Works

URL-Safe Variant

Embedding Images

API Data Transfer

Email Attachments

JWT Tokens

Data URIs

Configuration Storage

Features

Encode & Decode

File Support

URL-Safe Mode

Live Mode

UTF-8 Support

Copy & Download

Bidirectional

100% Client-Side

How to Use

TL;DR - Free Base64 Encoder/Decoder

Frequently Asked Questions

What is Base64 encoding?

What is URL-safe Base64?

How do I encode a file to Base64?

How do I decode Base64 back to text?

Is Base64 encoding the same as encryption?

Why does Base64 increase file size?

How do I create a data URL from Base64?

Is my data secure with this Base64 tool?

What is the difference between Base64 and Base64URL?

Can I encode Unicode and emojis in Base64?

Related Tools

Base64 Encoder/Decoder

Tool Capabilities

Client-Side (Browser)

Requires Server-Side

How It Works

URL-Safe Variant

Embedding Images

API Data Transfer

Email Attachments

JWT Tokens

Data URIs

Configuration Storage

Features

Encode & Decode

File Support

URL-Safe Mode

Live Mode

UTF-8 Support

Copy & Download

Bidirectional

100% Client-Side

How to Use

TL;DR - Free Base64 Encoder/Decoder

Frequently Asked Questions

What is Base64 encoding?

What is URL-safe Base64?

How do I encode a file to Base64?

How do I decode Base64 back to text?

Is Base64 encoding the same as encryption?

Why does Base64 increase file size?

How do I create a data URL from Base64?

Is my data secure with this Base64 tool?

What is the difference between Base64 and Base64URL?

Can I encode Unicode and emojis in Base64?

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