Image to Base64 Converter — Free Online Image Encoder
Convert images to Base64 strings for embedding in HTML, CSS, or JSON. Supports PNG, JPG, GIF, WebP, and SVG. Runs entirely in your browser.
How to Use the Image to Base64 Converter
- Upload image — drag and drop or click to select a file (PNG, JPG, GIF, WebP, SVG).
- View Base64 — the encoded string appears in the output textarea.
- Check file sizes — compare original file size vs Base64 encoded size.
- Choose embed format — select HTML img tag, CSS background-image, or raw data URI.
- Copy code — click copy to grab the embed code for your project.
- Download as text — save the Base64 string as a .txt file for later use.
- Batch mode — upload multiple images and process them all at once.
- Preview — see the embedded image rendered in the preview area.
Why Use This Image to Base64 Converter
Base64 encoding lets you embed images directly in HTML, CSS, or JSON without external file references. This is useful for email templates, inline images in Markdown, small icons in CSS, and situations where you can't host separate image files.
The tool shows file size comparison so you can make informed decisions about when Base64 encoding is appropriate. For small images like icons, the overhead is minimal. For large photos, linking to an external file is usually better. The batch mode processes multiple images at once for efficiency.
Frequently Asked Questions
Base64 encoding increases file size by approximately 33%. This is because Base64 uses 6 bits per character (ASCII) to encode 8-bit binary data. For a 100KB image, the Base64 string will be about 133KB. The tool shows the exact overhead for your file.
Use Base64 for small images (icons, logos under 10KB) where the overhead is negligible and you want to reduce HTTP requests. Use linked files for larger images where the 33% size increase would be significant. Base64 is great for email templates and inline Markdown images.
No! All encoding happens locally in your browser. Your images never leave your device. The tool reads the file using the FileReader API and encodes it entirely client-side.
The tool supports PNG, JPEG, GIF, WebP, and SVG. These are the most common web image formats. The encoded Base64 string includes the appropriate MIME type prefix (data:image/png;base64, etc.) for direct embedding.
Use Cases
Embedding Images in CSS Without Extra Requests
Encode small images as Base64 data URIs to embed them directly in CSS, eliminating additional HTTP requests.
Encoding Images for API Payloads
Convert images to Base64 strings for inclusion in JSON API requests and webhook payloads.
Creating Data URIs for Email Templates
Embed images directly in HTML email templates using Base64 data URIs for reliable email client compatibility.
Converting Logos for Inline HTML
Convert company logos to Base64 for inline HTML embedding where external file hosting isn't available.
Reducing HTTP Requests for Small Icons
Combine small icon images into Base64 strings to reduce HTTP requests and improve page load performance.