# Image to Base64 — Free Online (PdfPixels)

> Encode any image to a Base64 data URI with ready-to-paste HTML, CSS, and JSON snippets. Runs in your browser.

Canonical URL: https://www.pdfpixels.com/tools/image-to-base64
Processing: browser (client-side canvas)
Cost: free, no signup required for core use.

## Short answer

The Image to Base64 tool by PdfPixels encodes an image into a Base64 data URI with HTML, CSS, and JSON snippets. Pick a file and copy the format you need — it runs entirely in your browser.

## About

Image to Base64 encodes any image into a Base64 data URI and formats it as ready-to-paste HTML, CSS, and JSON. Inlining small images removes extra HTTP requests, keeps logos and icons inside a single HTML file, and sidesteps asset-pipeline issues in email templates — at the cost of roughly a third larger markup. Everything runs locally in your browser: the image is read with the FileReader API and never uploaded.

## Key features

- Data URI, HTML img, CSS url(), and JSON output formats
- Shows the Base64 size overhead versus the original file
- Runs 100% locally — the image never leaves your device
- One-click copy for every format
- Free with no signup and no upload at all

## How to use

1. **Choose an image** — Pick a PNG, JPG, WebP, GIF, or SVG from your device.
2. **Pick a format** — Switch between Data URI, HTML, CSS, and JSON snippets.
3. **Copy and paste** — Copy the snippet straight into your code or template.

## FAQ

### When should I Base64-embed an image?

For small, rarely-changing assets under a few kilobytes — icons, bullets, dividers. Large images bloat the document, block incremental rendering, and cannot be cached separately.

### How much bigger is Base64 than the original file?

About 33% larger, because every 3 bytes become 4 characters. The tool shows the exact overhead for your file.

### Is my image uploaded anywhere?

No. Encoding uses the browser’s FileReader API on your device. The tool works even with your network disconnected after the page loads.

### Is Image to Base64 free?

Yes — free with no signup. Because processing is local there are no server limits.

## Limits

- PDF tools: 50 MB per file. Merge: 20 files / 100 MB total / 1000 pages.
- Image tools: 25 MB, 50 MP max. AI tools: 20 MB.
- Rate limits: 20/min per processing route per IP.
- Server-side files are processed ephemerally and purged automatically within 60 minutes.

More tools: https://www.pdfpixels.com/tools — Full machine reference: https://www.pdfpixels.com/llms-full.txt