A data URI wraps Base64 (or other data) so browsers treat it like a URL. The common image form is data:image/png;base64, followed by the encoded characters. You can put that string in an img src or CSS background-image.

How do I convert an image to Base64 with this tool?

Drop or select an image. Mewix encodes it in your browser and shows Data URI, raw Base64, HTML, CSS, Markdown, and JSON snippets you can copy in one click.

Does Base64 make files larger?

Yes. Base64 text is typically about 33% larger than the original binary file because every three bytes become four ASCII characters. Use it for small icons, not large photos.

When should I use Base64 instead of a normal image URL?

Use Base64 for tiny assets (icons, bullets, email template images under roughly 10–50 KB) when avoiding an extra HTTP request matters. For product photos, blog heroes, or anything you want in Google Image Search, keep a normal hosted file URL.

Is Base64 good for SEO image ranking?

No for image search. Google indexes crawlable image URLs with alt text, not Base64 data URIs. Embed Base64 only for decorative or structural UI assets that do not need to rank.

Are my images uploaded to a server?

No. Encoding uses the FileReader / ArrayBuffer APIs in your browser. Files never leave your device.

Which formats can I convert to Base64?

Common web formats work: PNG, JPEG, WebP, GIF, SVG, AVIF, BMP, ICO, and others your browser can read. The tool detects MIME type for the data URI prefix.

How do I use the HTML or CSS output?

Paste the HTML snippet as an img element, or paste the CSS snippet into a rule like .icon { background-image: url("data:…"); }. Markdown and JSON tabs give ready strings for docs and APIs.

Can I convert Base64 back to an image?

Yes. Use the Base64 → Image tool (or the decode tab) to paste a data URI or raw Base64, preview it, and download the file.

Is there a size limit?

The browser must hold the whole string in memory. Very large images create huge text and can slow the tab. Compress or resize first if the Base64 output feels unwieldy.

Image to Base64

Convert any image to a Base64 string or data URI for HTML, CSS, Markdown, and JSON — entirely in your browser, with no upload.

Convert image to Base64

Drag & drop images here, or choose from your device

PNG, JPG, WebP, SVG, GIF and more · encodes in your browser

How to convert an image to Base64

Open the converter. Go to the Mewix Image to Base64 page in your browser.
Add an image. Drop or select a PNG, JPG, WebP, SVG, or other supported image. Nothing is uploaded.
Copy the format you need. Choose Data URI, raw Base64, HTML, CSS, Markdown, or JSON, then copy.
Paste into your project. Use the string in an img src, CSS background, email template, or API payload.

When not to use Base64

Skip Base64 for large photos, anything that should appear in Google Image Search, and assets shared across many pages (inlining bloats every HTML/CSS payload). Prefer a normal URL after compressing or converting the file. To decode a string back to a downloadable image, use Base64 to Image.

Frequently asked questions

Base64 converts binary image bytes into a text string using A–Z, a–z, 0–9, +, and /. That string can sit inside HTML, CSS, JSON, or Markdown instead of a separate image file URL.

How to convert an image to Base64

When not to use Base64

Frequently asked questions

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