Text to Base64 Encoder - Free & Instant Online
Encode plain text into Base64 instantly in your browser. Useful for data URIs, API payloads, and email attachments.
Related tools & use cases
How to use Text to Base64 Encoder - Free & Instant
- 1Type or paste the text you want to encode.
- 2The Base64 output appears instantly.
- 3Copy the result to use in a data URI, config file, or API payload.
Privacy & security
Encoding happens locally using the browser's native btoa() function.
Nothing is sent to a server.
Frequently asked questions
Why is the Base64 output longer than my input?
Base64 re-packs binary data into printable characters, which expands the size by about 33% — 3 bytes of input become 4 bytes of output.
Encoding Text to Base64 Online
Base64 encoding converts arbitrary text or binary data into a string using only printable ASCII characters — necessary anywhere binary data needs to safely travel through a text-only channel.
Common use cases
Embedding Small Assets as Data URIs
Encode a small image or font as Base64 to inline it directly in CSS or HTML, avoiding a separate network request.
Building Basic Auth Headers
Encode a username:password pair for an HTTP Authorization: Basic header (only ever safe to send over HTTPS).
Tips for best results
- Base64 is not encryption — never rely on it to protect sensitive data, only to safely represent it as text.
More questions answered
What's the difference between standard and URL-safe Base64?
Standard Base64 uses + and /, which have special meaning in URLs. URL-safe Base64 substitutes - and _ instead so the output can be used directly in a URL without escaping.