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Base64 encoding transforms binary data into ASCII text. Used to embed an image in HTML (<img src="data:image/png;base64,...">) without an external file, or to transmit data in a text-only format.
Free, no account required, browser processing and no server upload.
Base64 encoding transforms binary data into ASCII text. Used to embed an image in HTML (<img src="data:image/png;base64,...">) without an external file, or to transmit data in a text-only format.
Overhead by type
PNG image 100 KB
100 KB
~136 KB
+36%
Small SVG icon 2 KB
2 KB
~2.7 KB
+36%
String "Hello"
5 B
8 B
+60%
A 100 KB PDF becomes ~133 KB in Base64. Encoding increases size by about 33%. For large files, prefer a regular URL over a data URI.
Base64 is not encryption: anyone can decode the string instantly. Never use it to protect sensitive data.
Encode and decode Base64 helps you complete this task directly in your browser. You keep control of your data and get the result locally.
Yes. Encode and decode Base64 is free to use and runs in your browser without sending files or content to Lmaotools servers for processing or storage.
No. Files and content added to the tools are processed in your browser. They are not sent to Lmaotools servers for conversion or storage.
No. Open the tool, add your file or content, then get the result. Processing happens locally in your browser.