Free Online Tool · 100% Client-Side · Zero Tracking
Free Base64 Encoder Decoder Online
Encode any text to Base64 or decode Base64 back to readable text. Works for Unicode, binary data, and data URIs. Runs entirely in your browser — zero data sent anywhere.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is widely used to encode binary data for safe transmission over text-based protocols like HTTP, email (MIME), and JSON APIs. Common use cases include embedding images as data URIs in HTML/CSS, encoding JWT payloads, and passing binary data through query strings.
How to Use
1
Choose Mode
Select "Encode" to convert text → Base64, or "Decode" to convert Base64 → text.
2
Paste Input
Enter your plain text or Base64 string in the input box.
3
Click Button
Hit "Encode to Base64" or "Decode from Base64" to see the result instantly.
FAQ — Base64 Encoder Decoder
Is this Base64 encoder free?
Yes — 100% free. No account, no limits, no watermarks. Use it as many times as you want.
Is my data safe?
Yes. The tool runs entirely in your browser using JavaScript. Nothing is sent to any server. Safe for API keys, tokens, and private data.
Does it support Unicode and emoji?
Yes. The encoder uses UTF-8 encoding (encodeURIComponent + btoa) to correctly handle Unicode characters, including emoji and non-ASCII text.
What is URL-safe Base64?
URL-safe Base64 replaces + with - and / with _ to make the encoded string safe for use in URLs and filenames. JWTs use URL-safe Base64. Our tool handles both standard and URL-safe variants.
Can I encode images to Base64?
For small images, paste the binary content or use the data URI approach. For large file Base64 encoding, use our Hash Generator tool which supports file upload via the File Reader API.