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Base64 Image Encoder/Decoder

Convert images to Base64 strings for embedding in HTML, CSS, or JSON. Also decode Base64 strings back to images. 100% client-side processing.

Supported: JPG, PNG, WebP, GIF, SVG

What is Base64 Image Encoder/Decoder?

Base64 Image Encoder/Decoder is a free online tool that converts images to Base64-encoded strings and vice versa. Base64 encoding transforms binary image data into text format, allowing you to embed images directly in HTML, CSS, JavaScript, JSON, or APIs without separate image files. This tool supports JPG, PNG, WebP, GIF, and SVG formats and performs all encoding and decoding entirely in your browser using JavaScript—no uploads, no servers, complete privacy. Perfect for web developers embedding small images as data URIs, creating self-contained HTML emails, or working with APIs that require Base64 image payloads.

How to Use Base64 Image Encoder/Decoder

Encode Image to Base64:

  1. Select Mode: Click "Encode Image to Base64" (active by default).
  2. Upload Image: Click "Choose Image" and select an image file from your device.
  3. Preview: View your image and see its file size and format.
  4. Get Base64: The tool automatically encodes the image and displays the Base64 string.
  5. Copy: Click "Copy Base64" for the raw string, or "Copy Data URL" for the complete data URI format.
  6. Use: Paste the Base64 string into your HTML, CSS, or JSON as needed.

Decode Base64 to Image:

  1. Switch Mode: Click "Decode Base64 to Image".
  2. Paste Base64: Paste a Base64 string or complete data URL into the text area.
  3. Decode: Click "Decode to Image" to convert the string back to an image.
  4. Preview: View the decoded image rendered in the browser.
  5. Download: Click "Download Image" to save the image to your device.

Features

  • ✅ Encode images to Base64 strings
  • ✅ Decode Base64 strings back to images
  • ✅ Support for JPG, PNG, WebP, GIF, SVG
  • ✅ Copy raw Base64 or data URL format
  • ✅ Real-time encoding/decoding
  • ✅ 100% client-side processing (no uploads)
  • ✅ Download decoded images
  • ✅ Handles large images efficiently

Use Cases

  • Embed Images in HTML/CSS: Use data URLs to embed small images directly in stylesheets or HTML, reducing HTTP requests.
  • JSON/API Payloads: Send images as Base64 strings in API requests or responses (e.g., REST, GraphQL).
  • Self-Contained HTML Emails: Embed images as data URIs in email templates to avoid blocked external images.
  • JavaScript/React: Store images as Base64 in variables or state for dynamic rendering.
  • Testing & Development: Quickly encode/decode images for prototyping or debugging without managing separate files.

FAQ

What is Base64 encoding?
Base64 is a method of encoding binary data (like images) into ASCII text format using 64 characters. It allows images to be represented as text strings, making them easy to embed in code or transmit over text-based protocols.
What is a data URL?
A data URL is a URI scheme that embeds data inline. Format: data:[mimetype];base64,[base64string]. Example: data:image/png;base64,iVBORw0KG... This can be used directly in <img src=""> or CSS background-image.
Should I use Base64 for large images?
Base64 increases file size by ~33% and can make HTML/CSS files large and slow to parse. Use it for small images (icons, logos < 10KB). For large images, use separate image files with caching.
Are my images uploaded to a server?
No. All encoding and decoding happens locally in your browser using JavaScript FileReader and Canvas APIs. Your images never leave your device.
Can I decode Base64 from APIs?
Yes! If an API returns a Base64 image string, paste it into the decode mode (with or without the data:image/... prefix) to view and download the image.

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