Base64 Converter
Encode and decode Base64 text and files. Convert images to Base64 and back.
About Base64 Converter
Convert text and files to Base64 encoding and decode Base64 back to original content. Perfect for embedding images in HTML/CSS, encoding API payloads, and handling data URIs. Supports both text and file (image) conversion with instant results.
What Is Base64 Converter and Why Use It?
Base64 encoding solves a fundamental compatibility problem: how to represent binary data as plain text that can be transmitted through systems designed only for ASCII characters. Email protocols, JSON APIs, XML documents, and URL parameters all struggle with raw binary content. Base64 encodes binary data into a 64-character alphabet (A-Z, a-z, 0-9, +, /) that any text-based system can handle. Our Base64 Converter handles both text and image encoding with instant results. Web developers embed small icons directly in CSS as data URIs, eliminating separate HTTP requests. API developers encode binary payloads for REST endpoints that only accept JSON text. Email designers embed images in HTML messages so they display without external loading. Data scientists encode binary datasets for text-based analysis tools. The output size indicator helps you understand the 33% size increase that Base64 encoding inherently adds, making it easy to decide when embedding makes sense versus using separate files. All conversions happen locally for privacy when processing proprietary images or confidential text.
Tips for Best Results
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Base64 encoding increases file size by approximately 33% — only use it for small files.
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Data URIs work best for icons and small images under 5KB.
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When decoding, make sure the Base64 string is complete — truncated strings will fail.
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Use the image-to-Base64 feature for quickly generating CSS background-image data URIs.
How to Use Base64 Converter
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Choose the mode: Encode or Decode.
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For Encode: paste text or upload an image file. For Decode: paste Base64 string.
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The conversion happens instantly in your browser.
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Review the output size and format information displayed.
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Copy the result or download it as a file.
Common Use Cases
Web Development
Embed small images directly in HTML and CSS as data URIs to reduce HTTP requests.
API Development
Encode binary data for JSON payloads that only support text content.
Email Development
Embed images in HTML emails that display without external image hosting.
Data Transfer
Safely transfer binary data through text-only channels like copy-paste and chat.
Why Use Our Base64 Converter؟
Encode and decode Base64 text
Convert images to Base64
Copy to clipboard instantly
Show output size
100% client-side
Free and unlimited