Input example
FileDiffCheckerBase64 tool
Base64 Encode Decode Online
Encode plain text to Base64 or decode Base64 content when possible. No signup is required.
Open toolBrowser tool
Paste or upload content
The input is processed locally in your browser. You can copy, download, or share the result.
Paste or upload content, then run the tool.
When to use this Base64 encoder decoder
Use this Base64 tool when you need to encode plain text for a quick test or decode a Base64 sample to inspect what it contains. It is designed for everyday web, data, and developer workflows where a quick browser-side result is more convenient than opening a heavy desktop application.
The best workflow is to paste a small representative sample first, confirm the output looks correct, and then process the full content if it is appropriate to handle in your browser.
Example
Base64 Encode Decode Online example
Use this before-and-after sample as a quick reference for what the tool changes.
Output example
Encoded: RmlsZURpZmZDaGVja2VyReview checklist
Common mistakes to avoid
Assuming Base64 is encryption
Review this point before copying the output into another system, committing it to a project, or sending it to someone else.
Decoding sensitive tokens on shared screens
Review this point before copying the output into another system, committing it to a project, or sending it to someone else.
Using malformed Base64 strings with missing padding
Review this point before copying the output into another system, committing it to a project, or sending it to someone else.
Privacy and local processing
This Base64 encoder decoder runs in your browser. The page uses client-side JavaScript to process pasted text or uploaded files, and it does not require an account. Share links can include the content you entered, so only create or send a share link when the content is safe for the recipient to view.
For private projects, remove passwords, API keys, access tokens, personal information, customer records, and internal identifiers before using any online utility.
FAQ
Base64 Encode Decode Online FAQ
Does this tool upload my file?
The tool is designed to process content in your browser with client-side JavaScript. You should still avoid using sensitive files in any browser-based tool unless you are comfortable handling that data there.
Can I download the result?
Yes. After running the tool, use Download output to save the processed content as a local file.
Can I share the result?
Yes. Use Share link to copy a link containing the current input and output. Only share it with people who should see the content.