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 (like images or files) in text-based formats such as JSON, HTML, or email.

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 (or vice versa) to verify correctness.

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.

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.

Plain Text

Base64 Output

100% Private

No Upload

Instant

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

Use Cases

Base64 encode/decode guide Best Developer Tools JSONLint Alternative

Why Use Irreva for Base64 Encoder / Decoder?

Embed images in CSS or HTML as data URIs

Encode binary data for JSON APIs

Decode Base64 strings from API responses

Runs 100% in your browser — files never leave your device.

No account, no sign-up, no subscription — free forever.

Works on any device: desktop, tablet, or mobile.

Frequently Asked Questions

Base64 vs URL encoding Base64 encoding explained

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