Image to Base64 Converter
Convert any image (JPG, PNG, WebP, GIF, SVG, BMP) to a base64 encoded string. Choose between a full data URI or raw base64 output. Everything runs in your browser — your files are never uploaded.
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About This Tool
How to Use
- 1Click the upload area or drag and drop a single image file (JPG, PNG, WebP, GIF, SVG, or BMP, up to 10 MB).
- 2Choose whether to include the data URI prefix (e.g. "data:image/png;base64,") or omit it for a cleaner raw string.
- 3Select your preferred output format: "Data URL" for a ready-to-use URI, or "Raw Base64" for the encoded characters only.
- 4Click "Convert" to generate the base64 encoded string.
- 5Download the resulting .txt file or copy the base64 string directly from the preview.
When to Use
- •When embedding small images (icons, logos, placeholders) directly in HTML or CSS to reduce HTTP requests.
- •When including images inline in email templates where external image URLs may be blocked by email clients.
- •When storing image data in JSON configuration files, databases, or API payloads that only accept text.
- •When building single-page applications or offline-capable web apps that need self-contained image assets.
- •When sharing image data through text-only channels like chat messages, configuration files, or environment variables.
- •When creating data URIs for CSS background-image properties to eliminate extra network round-trips.
Tips & Tricks
- ✨Keep images small (under 50 KB) for inline embedding — base64 encoding increases the data size by roughly 33%, so large images can bloat your HTML or CSS significantly.
- ✨Use the "Raw Base64" output when you need to store the encoded string in a database or pass it through an API that builds its own data URI.
- ✨SVG files often produce smaller base64 strings than raster images and scale perfectly, making them ideal candidates for inline embedding.
- ✨For CSS background images, use the full data URL output and paste it directly into your background-image property value.
- ✨Consider using base64 for critical above-the-fold images to avoid render-blocking requests, but serve larger images as regular files for better caching.
- ✨When embedding in JSON, remember to escape the string properly — most JSON serializers handle this automatically.
Frequently Asked Questions
Base64 is a binary-to-text encoding scheme that converts binary data (like image files) into a string of ASCII characters. Encoding an image as base64 lets you embed it directly in HTML, CSS, JavaScript, or JSON without needing a separate image file. This reduces HTTP requests and is particularly useful for small icons, email templates, and offline applications.
A data URL (also called a data URI) includes a prefix like "data:image/png;base64," followed by the encoded string. This format is ready to use directly in an HTML <img> src attribute or CSS url() value. Raw base64 is just the encoded characters without the prefix — useful when you need to store or transmit the data separately and will construct the full URI yourself.
Yes. Base64 encoding increases the data size by approximately 33% compared to the original binary file. For example, a 30 KB image will produce roughly 40 KB of base64 text. This is why base64 embedding is best suited for small images; for larger files, serving them as regular image URLs with proper caching is more efficient.
No. All processing runs entirely in your browser using the native FileReader API. Your image files never leave your device and are not transmitted over the network. This makes the tool completely safe for sensitive or private images.
The tool supports JPEG (.jpg, .jpeg), PNG (.png), WebP (.webp), GIF (.gif), SVG (.svg), and BMP (.bmp). These cover virtually all common image formats used on the web and in applications.
For HTML, set the image src attribute to the full data URL: <img src="data:image/png;base64,...">. For CSS, use it in a background-image property: background-image: url("data:image/png;base64,..."). Make sure you use the "Data URL" output format with the prefix included.
The tool accepts images up to 10 MB. However, for practical inline embedding, images under 50 KB are recommended. Larger base64 strings can significantly increase the size of your HTML, CSS, or JavaScript files and may hurt page load performance.
This tool processes one image at a time to keep the output clean and focused. If you need to convert multiple images, simply run the tool once for each file. For batch workflows, consider using a build tool or script that automates the process.
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