Base64 Encoder & Decoder
Encode text to Base64, decode Base64 data and convert to URL-safe Base64 within seconds.
All operations are performed in your browser. The data you enter is not sent to the server.
Base64 encoding and decoding tool
Enter text or Base64 data in the left field and choose the operation you want to perform.
Input
Text or Base64Result
OutputBase64 Encoder & Decoder features
Base64 encoding, decoding, URL-safe conversion and copying of results are all available on a single page.
Base64 encoding
Converts text and Unicode characters to Base64 by processing them as UTF-8.
Base64 decoding
Decodes valid Base64 data and displays the original UTF-8 text content in a readable form.
URL-safe Base64
Converts the + and / characters for safer use in URLs and file names.
UTF-8 character support
Correctly processes Turkish characters, emojis and Unicode text in other alphabets.
Quick copy and download
You can copy the generated Base64 data or the decoded text to the clipboard and download it as a file.
Secure processing in the browser
Your data is processed directly on your device and is not sent to any server.
What is the Base64 Encoder & Decoder?
The Base64 Encoder & Decoder is a free online developer tool that converts text or binary data into a Base64 representation and converts Base64 data back to its original content.
Base64 is an encoding method that allows binary data to be represented using only printable ASCII characters. It makes it easier to transport binary data or data containing special characters in text-based systems such as email attachments, API requests, data URIs, authentication headers and configuration files.
Base64 is not an encryption method. Encoded data can be easily decoded without any secret key. Therefore, Base64 should not be used to secure sensitive information such as passwords, access keys or personal data.
How do you use the Base64 Encoder & Decoder?
Follow the steps below to encode or decode Base64.
Add your data
Paste the text you want to encode or the Base64 data you want to decode into the input field.
Choose the format
If needed, enable the URL-safe Base64 and padding removal options.
Run the operation
Start the conversion using the Base64 Encode or Base64 Decode button.
Use the result
Copy the generated result to the clipboard or download it as a text file.
Base64 encoding example
When the text below is encoded to Base64, a new representation consisting of ASCII characters is produced.
Original text
Tekno Danışman ile özel yazılım geliştirmeBase64-encoded value
VGVrbm8gRGFuxLHFn21hbiBpbGUgw7Z6ZWwgeWF6xLFsxLFtIGdlbGnFn3Rpcm1lBase64 encoding does not change the original text but alters how its characters are represented. The encoded data can be converted back to the original text using the Base64 Decoder.
What is the difference between standard Base64 and URL-safe Base64?
Both formats use the same encoding logic, but some of the characters used differ.
| Feature | Standard Base64 | URL-safe Base64 |
|---|---|---|
| Use case | General data transfer and storage | Use in URLs, query strings, cookies and file names |
| 62nd character |
+
|
-
|
| 63rd character |
/
|
_
|
| Padding | Usually = is used |
In some applications = is removed |
| Use within a URL | Additional URL encoding may be required | Better suited for use in URLs |
| Common example | Email attachments and data URIs | JWT Header and Payload sections |
+ character is replaced with - and the / character with _.What you should know about Base64 encoding
When working with Base64 data, the encoding structure, data size and security properties should be taken into account.
It is not encryption
Base64 does not hide data. Encoded content can be easily decoded without any key.
It increases data size
Base64 encoding generally increases data size by about one third.
Groups of four
The character length of standard Base64 output is generally a multiple of four.
Padding character
One or two = characters may appear at the end of the output to complete the data length.
Character encoding
Processing the same text with different character encodings can produce different Base64 results.
UTF-8 support
UTF-8 conversion should be used to process Turkish characters and Unicode text correctly.
Whitespace and line breaks
The Base64 Decoder can ignore spaces and line breaks but does not accept invalid characters.
URL-safe characters
In URL-safe Base64, - is used instead of + and _ instead of /.
Security check
Sensitive information encoded with Base64 should be encrypted separately and transmitted over secure communication channels.
Where is Base64 used?
Base64 allows binary data or data containing special characters to be transported through systems that only accept text.
REST API requests
Small files, credentials or binary content can be carried as Base64 inside JSON fields.
HTTP Basic Authentication
The username and password can be combined and sent in Base64 format in the Authorization header.
JWT tokens
The JWT Header and Payload sections are encoded using the URL-safe Base64 format.
Data URIs
Small images, fonts or files can be used as Base64 data URIs in HTML and CSS.
Email attachments
In the MIME standard, binary files can be encoded with Base64 so they can pass through text-based email systems.
Configuration and certificates
Certificates, keys or small blocks of binary data can be stored as Base64 in configuration files.
Frequently Asked Questions About the Base64 Encoder & Decoder
Read the answers to frequently asked questions about Base64 encoding, decoding, URL-safe Base64 and data security.
What is the Base64 Encoder & Decoder used for?
Is Base64 an encryption method?
How do you decode Base64 data?
Does Base64 increase data size?
What does the equals sign at the end of Base64 mean?
= characters at the end of a Base64 result are called padding. One or two padding characters may be used to complete the data into groups of three bytes.What is URL-safe Base64?
+ character in standard Base64 with - and the / character with _. This makes the value safer to use in places such as URLs, cookies and file names.Does Base64 support Turkish characters?
Can Base64 contain whitespace?
Can passwords be stored with Base64?
Is my Base64 data sent to a server?
Why does an invalid Base64 error occur?
Is the Base64 Encoder & Decoder free?
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