What is Base64 Encoder / Decoder?
Base64 is an encoding scheme that represents binary or text data using only 64 printable ASCII characters. It is widely used to embed images in CSS, send data in URLs and email, and store binary content in text-only formats like JSON and XML. A Base64 encoder and decoder converts your text to this format and back again.
This tool fully supports UTF-8, so it correctly encodes and decodes international characters and emojis, not just plain English.
How to Use the Base64 Encoder / Decoder
- Enter plain text to encode, or a Base64 string to decode.
- Click Encode to convert text into Base64.
- Click Decode to turn Base64 back into readable text.
- Copy the output for use in your code or documents.
Features of Our Base64 Encoder / Decoder
- Two-way Base64 encoding and decoding
- Full UTF-8 support for any language
- Clear error messages for invalid input
- Handles long strings instantly
- Copy and clear controls
- Runs entirely offline for privacy
Benefits & Use Cases
Developers encode data for data URIs, API tokens, basic authentication headers and configuration files. Decoding Base64 is equally common when inspecting JWTs, email attachments and encoded payloads.
Because encoding happens locally, you can safely work with tokens and sensitive strings without sending them to any server.
Converting data accurately is easy to get wrong by hand, and a single mistake can ripple through everything downstream. The Base64 Encoder / Decoder removes that risk by applying the correct rules every time, so the output you copy is dependable. Because it sits alongside our other converters, you can chain conversions and handle mixed data formats in one place rather than juggling several different websites.
Best of all, our Base64 Encoder / Decoder runs entirely inside your web browser. Nothing you enter is uploaded or stored on a server, so your data stays private and results appear instantly. It is completely free, requires no sign-up or installation, and it works beautifully on desktop, tablet and mobile alike. The interface supports both light and dark themes and is built with accessibility in mind, so it is comfortable to use for everyone. Bookmark this page and come back to the Base64 Encoder / Decoder as often as you need — it will always be here, ready and free to use.
Tips for Getting the Best Results
For the most accurate conversion, double-check that your input is formatted the way the Base64 Encoder / Decoder expects before you run it. Small details — an extra space, a missing separator, or the wrong notation — are the usual cause of unexpected output, and correcting them takes only a moment. When you are working with a large batch of data, convert a small sample first to confirm the result looks right, then process the rest with confidence.
Keep in mind that conversion is only as good as the source data you provide. If your figures or encodings need to be exact for a downstream system, verify a couple of results by hand the first time you use the Base64 Encoder / Decoder. Once you trust the output, you can rely on it for repeated use, knowing every conversion follows the same consistent, standards-based rules on every run.
FAQ about Base64 Encoder / Decoder
Is Base64 a form of encryption?
No. Base64 is encoding, not encryption. Anyone can decode it, so it should never be used to protect secrets — only to represent data safely as text.
Does it handle emojis and accents?
Yes. The tool encodes and decodes using UTF-8, so emojis, accented letters and non-Latin scripts all work correctly.
Why did decoding fail?
Decoding fails when the input is not valid Base64. Check for missing padding, spaces or characters that are not part of the Base64 alphabet.
Can I encode a whole file?
This tool focuses on text. To encode an image or file to Base64, use our dedicated Image to Base64 tool instead.