How to Use This Tool

1. Choose conversion mode: Select either the "Image → Base64" or "Base64 → Image" tab depending on what you need to do.

2. Provide your input: For Image to Base64 — click the drop zone or drag and drop an image file (JPG, PNG, GIF, WebP, BMP, SVG). For Base64 to Image — paste your Base64 string into the textarea.

3. Click Convert: Press the Convert button. The result appears instantly below — no server involved, no waiting.

4. Copy or download the result: For Base64 output click "Copy to Clipboard" to grab the string. For decoded images click "Download Image" to save the file to your device.

5. Clear and repeat: Click the Clear button to reset all inputs and outputs so you can start a fresh conversion.

Key Features

How the Conversion Works

Base64 is a binary-to-text encoding scheme. It represents binary data (like an image) using only 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). This makes it safe to embed binary content inside text-based formats.

Image → Base64 (Encoding)

The browser's FileReader.readAsDataURL() reads the raw binary image file and converts it to a Base64-encoded data URI automatically. The output size is approximately 4/3 × the original binary size (a ~33% increase).

Base64 → Image (Decoding)

The tool detects whether your pasted string already contains a data URI prefix. If not, it assumes PNG and prepends the correct header. The decoded blob is displayed as a preview image and offered as a downloadable file.

Practical Examples

What Is Base64 Image Encoding?

Base64 image encoding is the process of converting a binary image file into a string of printable ASCII characters. The resulting string can be embedded directly inside HTML, CSS, JavaScript, JSON, XML, or any other text-based format without needing to host the image separately. This technique is widely used in email templates, data URIs, offline web apps, and API payloads.

The term "Base64" refers to the 64-character alphabet used in the encoding: uppercase A–Z, lowercase a–z, digits 0–9, plus (+), and slash (/), with equals (=) used for padding. Every 3 bytes of binary data map to exactly 4 Base64 characters, which is why the encoded output is always about one-third larger than the original file.

Decoding reverses the process — the Base64 string is converted back to binary, reconstructing the original image perfectly. Because Base64 is a lossless encoding (not compression), the decoded image is byte-for-byte identical to the original.

This Tool in Multiple Languages