Base64 Encoder Online
Encode text, files, and images to Base64 instantly — UTF-8 perfect, Base64URL safe, up to 100MB, and 100% private in your browser.
LIVE
Encode a file to Base64
Drop your file here, or click to browse
Maximum file size: 100MB
What is Base64 encoding?
Advanced options explained
Security & Privacy
Completely free
How Base64 works
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is used in JWT tokens, CSS image embedding, email attachments (MIME), API authentication, and webhooks.
Is Base64 safe for passwords?
No. Base64 is encoding, not encryption. Anyone can decode it instantly. For passwords, use bcrypt, SHA-256, Argon2, or similar hashing algorithms with a salt.
How do I convert an image to Base64?
Use our Image to Base64 converter: drag and drop your image, click Convert, and get the Base64 string instantly. Perfect for embedding in CSS, HTML, and API payloads.
Does Base64 encoding increase file size?
Yes, by approximately 33%. Three binary bytes are encoded as four ASCII characters. Use Base64 when you need binary data in text-based formats (JSON, XML, CSS), not for serving images at scale.
What is Base64URL safe encoding?
Base64URL is a variant of Base64 that replaces + with -, / with _, and removes = padding. Defined in RFC 4648 §5. Ideal for JWT tokens, URL parameters, filenames, and webhooks.