Base64-encode a String
Convert a string to Base64 encoding, right in your browser. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Base64-encode a String
- 1. Paste the text to encode. Type or paste the string you want converted, from a plain word to a full sentence with accented or Unicode characters.
- 2. Choose URL-safe alphabet if needed. Turn on URL-safe alphabet (no padding) when the result will go into a URL path or query string, since it swaps '+' and '/' for '-' and '_' and drops trailing '=' signs.
- 3. Copy the Base64 result. Copy the encoded string and paste it into your API request, config file, or wherever a Base64 value is expected. The result stays in your browser the whole time.
When to use Base64-encode a String
Base64-encode a String converts a string into Base64, the encoding that lets arbitrary text and binary data travel safely through text-only channels like JSON fields, URLs, and HTTP headers. It runs entirely in your browser, so nothing you type leaves your machine.
- Building a Basic Auth header. You need to manually construct an Authorization header for testing an API with curl or Postman, which requires the 'username:password' string Base64-encoded first.
- Embedding data in a URL. A single-page app passes a small JSON payload as a query parameter and needs it Base64-encoded with the URL-safe alphabet so it survives being placed in a link.
- Preparing a data URI. You are hand-building a data: URI for a small SVG or text snippet and need the content portion Base64-encoded before assembling the full URI string.
- Encoding a config secret. A Kubernetes Secret or environment file expects values in Base64; encoding a plain connection string here gives you the exact value to paste into the manifest.
Examples
Encode a greeting
Input
Hello
Output
SGVsbG8=
About the Base64-encode a String tool
Base64-encode a String runs as plain JavaScript in your browser tab, with no server behind it. Convert a string to Base64 encoding, right in your browser. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's String Tools section, 159 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the URL-safe alphabet (no padding) setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Is Base64-encode a String free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.