Base64 Encoder / Decoder
Encode or decode text to/from Base64 format instantly.
How it works
Type or paste any text string and click Encode to convert it to Base64 format. Paste a Base64 string and click Decode to convert it back to plain text. The conversion happens instantly in your browser with no data sent to any server.
Why use this tool?
Widely used by developers to encode binary data for transmission in APIs, embed images as data URIs in HTML/CSS, and store credentials in HTTP Basic Auth headers. A must-have free online Base64 encoder decoder tool.
Frequently Asked Questions
What is Base64 encoding?
Base64 converts binary data into a string of 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). This allows binary content like images and files to be safely transmitted in text-based protocols like HTTP headers, JSON, and email.
Does Base64 encrypt my data?
No. Base64 is encoding, not encryption. Anyone can decode a Base64 string instantly. Never use Base64 to protect sensitive data — use proper encryption (AES, RSA) for that purpose.
Why is Base64 output longer than the original?
Base64 encodes 3 bytes of input as 4 characters of output, making the result about 33% larger than the original. This is the tradeoff for making binary data text-safe.
Is this free?
Yes, completely free and works entirely in your browser. Your data is never sent to any server.
Rate this tool:
Was this tool helpful?