Encoder Tool
Image to Base64 Encoder
Convert any image to a Base64 string or Data URI instantly. Embed images directly in HTML, CSS, or JSON. 100% client-side.
Freeno limits, no watermarks
Instantreal-time conversion
100%private — runs in browser
Drag & drop an image here or browse
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What is Base64 Image Encoding?
Base64 encoding converts binary image data into a text string made of ASCII characters. This lets you embed images directly inside HTML, CSS, JavaScript, or JSON files without needing separate image files. It is widely used for small icons, email templates, and reducing HTTP requests.
When Should You Use Base64 Images?
- Small icons and logos under 10 KB
- Email HTML templates that need inline images
- Single-page apps where you want to reduce HTTP requests
- CSS sprites or background images embedded in stylesheets
- Data transfer in JSON APIs that don't support binary
Frequently Asked Questions
What is Base64 encoding?▶
Base64 is a binary-to-text encoding scheme that represents binary data (like images) as an ASCII string. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent the data, making it safe for embedding in text-based formats like HTML and CSS.
Why use Base64 images instead of regular files?▶
Base64 images eliminate the need for separate HTTP requests, which can speed up page loading for small images. They are also essential for HTML emails, where external images are often blocked by default. However, they increase file size by about 33%, so they are best for small images.
Does Base64 increase the file size?▶
Yes, Base64 encoding increases data size by approximately 33%. A 10 KB image becomes roughly 13.3 KB when encoded. For this reason, it is recommended only for small images (under 20-30 KB). For larger images, serving them as separate files is more efficient.
Which browsers support Data URIs?▶
All modern browsers fully support Data URIs, including Chrome, Firefox, Safari, Edge, and Opera. There are no practical size limits in modern browsers. Internet Explorer 8 had a 32 KB limit, but that browser is no longer in use.