Free Base64 Encoder
Turn any text into a Base64 string in one click. This free encoder handles full UTF-8 — emoji, accented characters, and CJK scripts encode correctly — offers a URL-safe alphabet option, optional line wrapping for PEM-style output, and never sends your data anywhere.
Base64 output
How to Use the Base64 Encode
- Type or paste your text into the input box.
- Choose standard or URL-safe alphabet and an optional line-wrap width.
- Click Encode to generate the Base64 string instantly.
- Copy the result or download it as a .txt file.
Features
The encoder converts text to bytes with UTF-8 first, so every Unicode character round-trips correctly — a step many quick tools skip. You can switch to the URL-safe alphabet (- and _ instead of + and /) for tokens and query strings, and wrap output at 64 or 76 characters for MIME and PEM-style formats. Input and output sizes are shown so you can see the ~33% overhead Base64 adds.
Benefits & Use Cases
Developers use Base64 encoding to embed images in CSS as data URIs, build Basic-auth headers, pack binary blobs into JSON APIs, and create test fixtures. Doing it locally means credentials and proprietary content never transit a server, and the instant in-browser conversion keeps tight debugging loops fast.
Tips
Remember Base64 is an encoding, not encryption — anyone can decode it, so never use it to hide secrets. If your output will live in a URL, enable the URL-safe alphabet to avoid percent-encoding + and /. For very large inputs, the download button saves you from clipboard limits.
Frequently Asked Questions
What is Base64 encoding used for?
Base64 converts binary data or text into a safe ASCII string using 64 characters. It is used for data URIs in HTML/CSS, email attachments (MIME), embedding binary in JSON or XML, and HTTP Basic authentication headers.
Does Base64 encoding encrypt or protect my data?
No. Base64 is an encoding, not encryption — anyone can decode it instantly. Never rely on Base64 to hide passwords, tokens, or secrets.
Why is the output longer than my input?
Base64 represents every 3 bytes of input as 4 characters, so output is about 33% larger than the input, plus padding. This overhead is the price of making binary data text-safe.
Will emoji and non-English text encode correctly?
Yes. The text is converted to UTF-8 bytes before encoding, so emoji, accented letters, Arabic, Chinese, and every other Unicode script round-trip perfectly.
What is URL-safe Base64?
A variant that replaces + with - and / with _, so the output can be placed directly in URLs and filenames without percent-encoding. Enable it when generating tokens or query-string values.
Is my text uploaded anywhere?
No. Encoding runs entirely in your browser via JavaScript. Your input never leaves your device.
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