Base64 Encoder / Decoder — Free Online Tool
Encode or decode Base64 strings instantly
How to use this tool
- [01]Paste text or a Base64 string into the input field.
- [02]Select Encode to convert to Base64, or Decode to convert a Base64 string back to its original text.
- [03]Copy the result — the conversion updates instantly as you edit the input.
About this Base64 Encoder / Decoder
Base64 Encoder/Decoder converts binary or text data into a plain ASCII string (encoding) or reverses that process back to the original data (decoding), using the standard Base64 alphabet of A–Z, a–z, 0–9, and two symbols. It's important to be clear about what Base64 is and isn't: it's an encoding scheme for representing binary-safe data as text, not an encryption method — anyone can decode Base64 with this tool or a one-line script, so it provides zero confidentiality on its own.
The practical reason Base64 exists is that many older text-based protocols and formats — email attachments, some APIs, embedding a small image directly inside a CSS or HTML file as a data URI — can't safely carry raw binary data, so encoding it as text first avoids characters that would break the transport format. A Base64-encoded string is roughly 33% larger than the original binary data, which is the tradeoff for making it transportable as plain text.
Common uses include decoding a JWT token's payload segment to inspect its contents, embedding a small icon directly into CSS with a data: URI instead of a separate file request, and encoding binary file contents for APIs that expect a text field. For encryption or securing sensitive data, use an actual cryptographic method — Base64 is not a substitute.
Encoding and decoding both happen entirely in your browser; nothing you enter is sent to a server.
Our Base64 Encoder / Decoder is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.
Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.
Frequently asked questions
Is the Base64 Encoder / Decoder completely free?
Yes, the Base64 Encoder / Decoder is 100% free to use with no hidden charges, no subscription, and no signup required. Simply visit the page and start using it immediately.
Does this tool upload my files to a server?
No. Everything runs entirely in your browser using JavaScript. Your files, text, and data never leave your device and are never sent to our servers. This makes it completely private and secure.
Does the Base64 Encoder / Decoder work on mobile?
Yes, the Base64 Encoder / Decoder is fully responsive and works on all devices including smartphones, tablets, and desktop computers. It works on Chrome, Firefox, Safari, and Edge browsers.
How accurate is this tool?
Our Base64 Encoder / Decoder uses industry-standard algorithms to ensure accurate results every time. It has been tested extensively across different browsers and devices to ensure consistent and reliable output.
Is Base64 encoding a form of encryption?
No. Base64 is an encoding scheme, not encryption — anyone can decode it instantly with this tool or a single line of code. Don’t use it to protect sensitive data; use actual encryption for that.
Why is the encoded output longer than my original text?
Base64 represents binary data using a smaller character set than raw bytes allow, which inflates the size by roughly 33% — that overhead is the tradeoff for making the data safely transportable as plain text.
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