Image to Base64
Convert images to Base64 Data URI. Files never leave your browser.
Drag image or click to select
Supports PNG, JPG, GIF, SVG, WebP
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Filename
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Format
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Original Size
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Base64 Size
Practical Example
Convert a small icon or email-template image into a Data URI when you need to embed it directly in HTML or CSS. Check the output length and MIME type, and keep larger images as regular files to avoid bloated markup.
When to use image-to-Base64 conversion
Converting images to Base64 turns binary files into text-safe payloads for HTML, CSS, and JSON workflows. It is especially useful for quick prototyping, API payload validation, and restricted environments.
Practical scenarios
- Inline small icons in CSS to reduce extra network requests during UI testing.
- Embed image samples in JSON payloads for API integration checks.
- Render temporary previews when direct file hosting is unavailable.
Caveats
- Base64 output is typically about 33% larger than the original file.
- Inlining large assets can increase document size and slow initial rendering.
- Frequently reused assets are often better served as normal files for caching efficiency.
Inline as Data URI or Keep as a File?
| Factor | Inline (Data URI) | Separate image file |
|---|---|---|
| File size | Icons and logos of a few KB | Photos and banners of tens of KB and up |
| Reuse | Used on a single page | Shared across pages (browser cache wins) |
| Environment | Email templates, single-file HTML, blocked external requests | Ordinary websites |
| Change frequency | Rarely changes | Swapped often (replace the file, done) |
Inlining to cut request counts made sense before HTTP/2; multiplexed connections have mostly erased that benefit. What remains valuable is the environments where you simply cannot attach a file — HTML email, JSON payloads, offline single-file documents.
Size Growth, Concretely
Base64 maps 3 bytes to 4 characters, so output is exactly 4/3 of the input plus padding. A 2 KB favicon becomes about 2.7 KB of text; a 15 KB PNG logo about 20 KB; a 200 KB product photo about 267 KB. Embedded in HTML, that string usually ends up larger than the original binary even after gzip, and inside CSS it delays rendering until the whole stylesheet parses. The encoding itself is explained in the Base64 guide.
FAQ
Are uploaded images sent to a server?
No. Conversion is performed locally in your browser.
Is Data URI the same as Base64?
Data URI is a full format that includes MIME metadata plus the Base64 body.
Which formats are supported?
Common browser-readable formats such as PNG, JPG, GIF, WebP, and SVG.