Base64 Encoder & Decoder - Text & File Converter
Encode and decode Base64 strings and files with full UTF-8 Unicode support and URL-safe formatting options.
How to use Base64 Encoder / Decoder in 3 simple steps
Choose Mode
Select Encode to turn plain text/files into Base64, or Decode to extract original content.
Enter Text or Upload File
Type or paste content into the box, or drop a file to convert it directly into Base64 Data URI.
Copy or Download
Toggle URL-safe encoding if needed, then copy or download the result.
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Safe Base64 Conversion with Full Unicode and File Support
Base64 encoding is widely used to transmit binary data, inline images, authentication tokens, and email attachments safely across text-based protocols. A frequent trap of standard JavaScript Base64 implementations (like window.btoa) is that they crash when handling non-ASCII Unicode characters (such as emojis or accented foreign text).
Toolnova Base64 Converter is engineered with comprehensive UTF-8 encoding pipelines using TextEncoder and TextDecoder. It encodes multi-byte Unicode text without data corruption.
Additionally, you can encode binary files (such as icons or fonts) directly into Base64 Data URLs for embedding into CSS or HTML, with an optional URL-safe mode substituting "+" and "/" characters.
Key features & capabilities
Frequently asked questions about Base64 Encoder / Decoder
Common questions about usage, privacy, limits, and browser compatibility.
Can I decode Base64 that contains emojis or accented text?
The converter uses a UTF-8 pipeline built on TextEncoder and TextDecoder, so emoji, accented letters, and non-Latin scripts decode back to their original characters. Standard browser functions such as btoa often throw on these characters, which is why the tool avoids relying on them alone. Round-trip the output to confirm nothing was corrupted.
Is my Base64 data uploaded to a server?
Encoding and decoding both run locally in your browser, so text, tokens, and uploaded files stay on your device. Nothing is transmitted, stored, or logged remotely. That makes the tool suitable for credentials and internal documents you would not hand to a third party.
What is URL-safe Base64 and when should I use it?
URL-safe mode replaces the plus and slash characters with hyphen and underscore, avoiding escaping problems in query strings, filenames, and token-style strings. Use it whenever the encoded value will travel inside a URL or a system that treats those characters specially. Standard Base64 is fine for inline data URIs and email bodies.
How do I convert an image or font to a Base64 data URI?
Drop the file into the converter and it returns a Base64 string you can paste into CSS or HTML as a data URI. The result carries the whole file, so large assets produce very long values that inflate your stylesheet. For icons and small fonts that tradeoff is usually acceptable.
Why is Base64 output about a third larger than the original?
Base64 encodes every 3 bytes of binary data as 4 printable ASCII characters, adding roughly 33 percent overhead. That expansion is the cost of making binary content safe for text-only protocols. It is not compression, so avoid stacking Base64 on files that are already compressed.
Does Base64 encryption protect my data?
Base64 is an encoding, not encryption, so anyone can reverse it without a key. It only makes binary or Unicode content safe to move through text channels such as email, JSON, and URLs. Treat encoded secrets as plain text and protect them with real encryption.