Base64 Encoder Decoder – Encode & Decode Free Online
Encode text or files to Base64 and decode Base64 strings instantly. Swap mode, file encoding, one-click copy. Free, no upload required.
Frequently Asked Questions
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It is commonly used to embed binary data (like images or files) in text-based formats such as JSON, HTML, or email.
Yes. Click 'Encode File' to select any file from your device. The tool reads it locally and outputs the Base64-encoded string. The file is never uploaded to a server.
Swap moves the current output into the input field and switches the mode, so you can quickly round-trip encode then decode (or vice versa) to verify correctness.
No — Base64 actually increases data size by about 33% because it encodes every 3 bytes of binary data as 4 ASCII characters. It is an encoding scheme, not a compression algorithm.
Yes. All encoding and decoding uses the browser's built-in btoa() and atob() functions. Nothing is sent to any server.
What is Base64 Encoder / Decoder?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It is widely used to embed binary data such as images, files, or certificates inside text-based formats like JSON, HTML, CSS, XML, and email. Our Base64 Encoder/Decoder lets you encode plain text or any file to Base64, and decode Base64 strings back to readable text. All processing uses the browser's built-in btoa() and atob() functions - nothing is sent to any server.
How to Use Base64 Encoder / Decoder
- 1Select Encode mode to convert text to Base64, or Decode to convert Base64 back to text.
- 2Type or paste your input text into the left panel.
- 3The output appears instantly in the right panel.
- 4To encode a file, click Encode File and select any file from your device.
- 5Use the Copy button to copy the output, or the Swap button to reverse the operation.
Key Features
- ✓Encode text to Base64 and decode Base64 to text
- ✓File encoding - encode any file to Base64
- ✓Swap button to quickly reverse encode/decode
- ✓One-click copy to clipboard
- ✓Character count display for output
- ✓Runs entirely in your browser
Benefits
- →Embed images in CSS or HTML as data URIs
- →Encode binary data for JSON APIs
- →Decode Base64 strings from API responses
- →Encode email attachments and certificates
- →Keep data private - no server upload
Why Use Irreva for Base64 Encoder / Decoder?
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It is commonly used to embed binary data in text-based formats such as JSON, HTML, or email.
Does Base64 compress data?
No. Base64 actually increases data size by about 33% because it encodes every 3 bytes of binary data as 4 ASCII characters. It is an encoding scheme, not a compression algorithm.
Can I encode files with this tool?
Yes. Click Encode File to select any file from your device. The tool reads it locally and outputs the Base64-encoded string. The file is never uploaded to a server.
What is the Swap button for?
Swap moves the current output into the input field and switches the mode, so you can quickly round-trip encode then decode to verify correctness.
Is my data private?
Yes. All encoding and decoding uses the browser's built-in btoa() and atob() functions. The text or file you encode is processed in browser memory only  it is never transmitted to Irreva's servers or any third-party service.
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