Trình mã hóa Base64

Base64 is a way to represent binary data using only 64 safe text characters (A to Z, a to z, 0 to 9, plus and slash). It lets you carry bytes through systems that only handle text, such as JSON, XML, email and URLs.

Type or paste your text in the input box and click Encode. The Base64 string appears in the output box. The tool shows the original and encoded size, and you can copy the result or download it as a text file.

Click Choose file and select any file, such as a PNG, JPG, PDF or font. The tool reads it in your browser and outputs the Base64 string. To use an image in HTML or CSS, put the string after data:image/png;base64, in the src or url.

No. Base64 is an encoding, not encryption. Anyone can decode it in one click, so never use it to hide passwords or secrets. Use real encryption for sensitive data.

Base64 stores every 3 bytes as 4 characters, so the output is about 33 percent larger. Line breaks, if you enable wrapping, add a little more.

Standard Base64 uses plus, slash and equals signs, which have special meaning in URLs. URL-safe Base64 swaps plus for a hyphen, slash for an underscore and removes the equals padding. Tick URL-safe when the string goes into a link, a filename or a JWT style token.

It inserts a line break every 76 characters, the format used by MIME email and PEM files. Leave it off for a single continuous string, which is what most APIs and data URIs expect.

Yes. Text is converted to UTF-8 bytes before encoding, so accented letters, Arabic, Chinese, emoji and other symbols encode correctly and decode back to the same text.

No. Encoding runs entirely in your browser. Your text and files are never sent, stored or logged, so it is safe for private content.

Very large files can slow or crash a browser tab, so the tool sets a maximum file size and tells you if a file is too big. For huge files use a command line tool such as base64.

Use the Base64 decoder. Paste the string and it returns the original text, or offers a file download when the data is binary such as an image or PDF.

Yes. It is free with no sign-up and works on phones, tablets and computers.