What the Base64 tool does
The CubTools Base64 tool has one job and does it well: it converts plain text into a Base64 string (encoding), and converts a Base64 string back into readable text (decoding). Developers use it for API keys, configuration values, data URIs, and debugging encoded payloads.
Everything happens locally in your browser. Your text is never uploaded to a server, nothing is stored, and there is no account to create. Open the page, paste your text, and copy the result — that is the whole process.
Encoding text to Base64
Select the Encode mode, paste or type your text into the input box, and the Base64 output appears instantly. The tool handles international characters correctly by treating your input as UTF-8, so accented letters, Chinese characters, and emoji all survive the round trip.
Long strings are fine, and line breaks inside your text are preserved as part of the encoding. If you plan to paste the result into a URL or a JSON value, double-check whether you need the URL-safe variant, which swaps two characters to avoid breaking links.
Decoding Base64 back to text
Switch to Decode mode, paste the Base64 string, and the original text appears. The tool tolerates the padding characters (=) at the end, which are a normal part of Base64 output and simply mark how the last bytes were aligned.
If decoding fails or produces garbled output, the usual culprits are missing padding, stray spaces or line breaks copied along with the string, or a string that was never valid Base64 to begin with. Cleaning the input usually fixes it immediately.
Getting clean results every time
For the most reliable results, copy the Base64 string exactly as produced — including any trailing = characters — and avoid letting rich-text editors reformat it. When you decode, confirm the output matches the original; a quick round-trip check catches most mistakes before they reach your code or config.
What to do with the decoded result
Decoding is only half the job — what you do with the result matters just as much. If you decoded a config value or token, paste it directly into its destination instead of saving it in a stray text file. Decoded secrets are more sensitive than their encoded form precisely because they are readable, so handle them with corresponding care.
If the decoded output is JSON or another structured format, verify that it parses before relying on it — a successful decode only guarantees valid Base64, not valid content. And never execute decoded content blindly: a Base64 string can conceal a script or command, and while decoding a stranger's string to inspect it is safe, running what comes out is not.
Steps
- Open the CubTools Base64 tool in your browser — no sign-up needed.
- Choose Encode mode to turn text into Base64, or Decode mode for the reverse.
- Paste your text (or Base64 string) into the input box.
- The result appears instantly — copy it, including any trailing = padding.
- If decoding, verify the output matches the original text.
- Paste the result into your code, config, or document.
Frequently asked questions
Is Base64 a form of encryption?
No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string instantly, so never use it to hide passwords, tokens, or anything sensitive.
Why does my Base64 output end with = or ==?
Those are padding characters. Base64 works in blocks, and padding marks how the final group of bytes was filled. They are normal — keep them when you copy the string.
Is there a limit on how much text I can convert?
The tool handles typical developer-sized inputs comfortably — keys, tokens, snippets, and config blocks. Extremely large documents are better handled by a script, but everyday use has no practical limit.
Does the tool work offline?
The conversion itself runs entirely in your browser with JavaScript, so once the page has loaded, encoding and decoding do not need a network connection.