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Filesvo

Image to Base64 Converter

Turn an image into a Base64 string for embedding directly in HTML, CSS, JSON or emails. Filesvo generates the data URI plus ready-to-paste CSS and HTML snippets, each with a copy button — all computed on your device.

or drag and drop an image here — you can also paste from the clipboard

Processed on your device — files are never uploaded to Filesvo.

How to use Filesvo

  1. Select or drop an image file, or paste one from your clipboard.
  2. Copy the snippet you need: data URI, raw Base64, CSS background or HTML img tag.
  3. Paste it into your code, stylesheet or document.

When to embed images as Base64

A Base64 data URI packs an entire image into a text string, letting you embed it directly in an HTML page, CSS file or JSON payload with no separate file or extra network request. That's genuinely useful for small icons, tiny logos, email signatures and self-contained documents.

The trade-off is real: Base64 encoding makes data about 33% larger than the original file, and embedded images can't be cached separately by the browser. For images beyond a few tens of kilobytes, linking a normal image file is almost always faster — Filesvo warns you when a file crosses that line instead of leaving you to find out from a slow page.

Private by design

Your files are processed directly in your browser using the browser's built-in image APIs and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

Frequently asked questions

Why is the Base64 string larger than my image file?
Base64 represents every 3 bytes of binary data as 4 text characters, so the encoded string is about 33% larger than the file by design. No Base64 encoder can avoid this — it's the cost of representing binary data as safe text.
What's the difference between the data URI and raw Base64?
The data URI includes a prefix (data:image/png;base64,…) that tells browsers what the content is, so it can be used directly in src attributes and CSS. Raw Base64 is just the encoded payload, for cases where your code or API adds its own framing.
When should I not use Base64 images?
For anything larger than roughly 100 KB, or images used on many pages. Embedded images bloat your HTML/CSS, can't be cached independently and slow initial page loads. Link a normal image file — optionally compressed with Filesvo first — instead.
Is my image uploaded to generate the Base64?
No. The encoding is done by your browser's own FileReader API. The image and its Base64 string never leave your device.

Related Filesvo tools

Base64 to Image

Decode a Base64 string or data URI back into an image you can preview and download.

Compress Image

Reduce JPG, PNG and WebP file sizes in your browser with adjustable quality and honest before/after numbers.

PNG to WebP

Convert PNG images to compact WebP files with transparency preserved — in your browser.