Base64 Encoder — Text to Base64
Encode any text or string to Base64 format instantly. Supports Unicode, emoji, and special characters. 100% client-side processing.
How to Encode Text to Base64
- 1Type or paste the text you want to encode
- 2The Base64 encoded output appears automatically
- 3Copy the encoded string with one click
- 4Use the Base64 Decoder to reverse the process
Key Benefits
- Encodes any text including Unicode and emoji
- Real-time encoding as you type
- No size limits for typical use cases
- Your input stays in your browser — nothing is sent to an external server
Frequently Asked Questions
What is Base64 encoding?
Base64 is an encoding scheme that converts binary data into ASCII text using a 64-character alphabet (A-Z, a-z, 0-9, +, /). Every 3 bytes of input become 4 characters of output. It exists because text-based protocols — email, HTTP headers, JSON — can safely carry only printable ASCII, while raw binary bytes can get corrupted or misinterpreted in transit. Base64 solves this by making binary data look like plain text.
Is Base64 the same as encryption?
No — and this is an important distinction. Base64 is encoding, not encryption. Anyone can decode it in seconds with any Base64 decoder. It provides no confidentiality whatsoever. If you need to protect sensitive data, use proper encryption (such as AES). Base64 is purely a transport format, not a security measure.
When is Base64 encoding used?
Common uses: embedding images or fonts directly in HTML/CSS as data URIs (data:image/png;base64,...), sending binary payloads inside JSON API responses, including certificates or public keys in text files (PEM format), MIME email attachments, and encoding binary data for storage in systems that only accept text.
Why does Base64 increase data size?
Base64 maps every 3 bytes to 4 ASCII characters, so the output is roughly 33% larger than the input. A 100 KB image embedded as a data URI becomes about 133 KB of text. This overhead is usually acceptable for small resources like icons but adds up for larger files — worth keeping in mind if you are embedding many assets this way.
How does this tool handle Unicode and emoji?
Unicode characters (including emoji) are first converted to UTF-8 bytes, then those bytes are Base64-encoded. This correctly round-trips back to the original text when decoded with a UTF-8-aware tool. Some environments' built-in Base64 functions only handle ASCII and will error on non-ASCII input — this tool adds the UTF-8 conversion step so any text works.
What is URL-safe Base64?
Standard Base64 uses + and /, which carry special meaning in URLs. URL-safe Base64 substitutes - for + and _ for /, making the output usable in query parameters and path segments without percent-encoding. When decoding a URL-safe string, use a decoder that supports this variant — pasting URL-safe Base64 into a standard decoder may produce errors or wrong output.