Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text.
About Base64 Encoder/Decoder
The GuruAlpha Base64 Encoder/Decoder converts text to Base64 encoding and decodes Base64 strings back to readable text. Base64 is a binary-to-text encoding scheme that represents binary data as ASCII text, commonly used for embedding images in HTML/CSS, encoding credentials in HTTP headers, and transmitting data over text-based protocols.
Base64 encoding is ubiquitous in web development. Email attachments use MIME/Base64 encoding. HTTP Basic Authentication encodes credentials as Base64. Data URIs embed images directly in HTML/CSS using Base64. JWT tokens contain Base64-encoded headers and payloads. The Base64 Encoder/Decoder makes it easy to work with these encoded strings in any context.
The encoder converts any text or binary data into a Base64 string. The encoding expands the data by approximately 33% — a 100-byte string becomes 133 bytes in Base64. This expansion is the trade-off for text-safe representation. The decoder reverses the process, converting Base64 back to the original text. Both operations are instant and handle any character encoding.
The tool supports multiple input formats. Paste plain text for simple encoding. Paste Base64 strings for decoding. The tool auto-detects whether the input is plain text or Base64 and offers the appropriate conversion. For binary data, the file upload option lets you encode files (images, PDFs, etc.) to Base64 for embedding.
For developers, the tool is essential for debugging API authentication (decoding Authorization headers), testing Data URI image embedding, and working with JWT tokens. The one-click copy feature makes it easy to transfer encoded/decoded strings between tools and code editors.
Key Features of Base64 Encoder/Decoder
- Encode text to Base64
- Decode Base64 to text
- Auto-detect input type
- File upload for binary encoding
- Supports all character encodings
- One-click copy to clipboard
- Instant processing in browser
- No data sent to servers
How to Use Base64 Encoder/Decoder
- Open the Base64 Encoder/Decoder on GuruAlpha.
- Paste text to encode or Base64 string to decode.
- The tool auto-detects and shows the appropriate result.
- Or click 'Encode'/'Decode' to force a specific operation.
- Copy the result to your clipboard.
- Use file upload for binary data encoding.
Tips for Using Base64 Encoder/Decoder
- Base64 is NOT encryption — anyone can decode it. Use it for data transport, not security.
- Data URIs using Base64 can embed small images directly in CSS, reducing HTTP requests.
- Decode JWT tokens to inspect claims — paste the middle section into the decoder.
- HTTP Basic Auth headers are 'Basic ' + Base64(username:password). Decode to verify.
- The tool handles all character encodings including UTF-8, ASCII and Latin-1.
Frequently Asked Questions About Base64 Encoder/Decoder
Is Base64 the same as encryption?
No. Base64 is an encoding scheme, not encryption. It converts binary data to text for safe transport. Anyone can decode Base64 without a key.
Why does Base64 make text longer?
Base64 uses 6-bit encoding, representing every 3 bytes of binary data as 4 ASCII characters. This 33% expansion is the trade-off for text-safe representation.
Can I encode files?
Yes. The file upload option lets you encode images, PDFs and other binary files to Base64 for embedding in HTML, CSS or data URIs.
What character encoding is used?
The tool supports UTF-8, ASCII, Latin-1 and other common encodings. UTF-8 is used by default for maximum compatibility.