Base64 Encode & Decode Instantly
Convert any text or file to Base64 — or decode Base64 back to readable text. Real-time, URL-safe mode, no sign-up, works in your browser.
Frequently Asked Questions
What is Base64 encoding?
Base64 is an encoding scheme that converts binary data (bytes) into a string of printable ASCII characters using 64 safe characters: A–Z, a–z, 0–9, +, and /. It's widely used to embed images, files, or binary data inside JSON, HTML, CSS, and email formats where binary data isn't allowed.
What is URL-safe Base64?
Standard Base64 uses + and / characters, which have special meaning in URLs and query strings. URL-safe Base64 replaces + with - and / with _ and removes padding = characters, making the result safe to include directly in a URL without percent-encoding.
Does Base64 support Unicode / emoji?
Yes. This tool uses TextEncoder to convert Unicode text to UTF-8 bytes before Base64 encoding, so it correctly handles characters from any language, emoji, and special symbols. The decoder reverses this with TextDecoder.
Can I encode files?
Yes. Drop any file into the "Encode a File" section below the main tool. The file is read locally in your browser and encoded to a Base64 string — nothing is uploaded to any server. Useful for embedding images or fonts in CSS/HTML as data URIs.
Is my data sent to a server?
No. All encoding and decoding happens entirely in your browser using JavaScript. Your text and files never leave your device. This makes the tool safe for encoding sensitive data like tokens or credentials.