# Image to Base64

Canonical URL: https://offlineutils.com/image-to-base64
Category: Media & Design
Published: 2026-07-10
Publisher: offlineutils.com
Runs entirely in the browser; nothing entered into the tool is uploaded.

> An Image to Base64 converter encodes an image file into a Base64 data URI you can paste directly into HTML or CSS, and decodes a data URI back into a downloadable image — all in your browser with no upload.

Drop an image to get its exact bytes as a data: URI, ready to inline as an img src, a CSS background-image, or anywhere a URL is accepted — with one-click copy for each. It reports the encoded size and warns when a data URI is large enough that a normal file reference would be better. Flip to decode mode to paste a data URI (or raw Base64), preview the image, and download it. Encoding uses the browser's FileReader so the original bytes are preserved exactly — no lossy re-encoding.

## Features

- Encode any image to a Base64 data URI
- Ready-made HTML img and CSS background-image snippets
- Decode a data URI or raw Base64 back to a downloadable image
- Preserves original bytes (FileReader, no re-encode)
- Size readout with a warning for oversized data URIs
- Runs entirely in your browser — nothing uploaded

## Use cases

- Inlining a small icon or logo into CSS to save an HTTP request
- Embedding an image directly in an HTML email or template
- Pasting an image into a JSON payload or data attribute
- Recovering an image from a data URI copied out of dev tools

## How to use it

1. **Choose a direction** — Pick Image to Base64 or Base64 to Image.
2. **Provide the input** — Drop an image to encode, or paste a data URI/Base64 to decode.
3. **Copy or download** — Copy the data URI or HTML/CSS snippet, or download the decoded image.

## When to use it, and when to use something else

- **vs Command-line base64** — use Image to Base64 when you want the ready-to-paste HTML/CSS wrappers and a live preview, on any device. Use Command-line base64 when you're scripting encoding in a build pipeline.
- **vs Referencing an image file normally** — use Image to Base64 when the image is tiny and you want to avoid an extra request. Use Referencing an image file normally when the image is more than a few KB — a file reference caches better and keeps HTML/CSS small.

## Frequently asked questions

### What is a Base64 data URI?

It's a way to embed a file's bytes directly in text using the data: scheme, e.g. data:image/png;base64,iVBORw0... A browser treats it as if it were a URL to the image, so you can inline images in HTML or CSS.

### When should I inline an image as Base64?

For very small, critical images (tiny icons, a 1px gradient) where avoiding a separate request matters. Base64 adds ~33% size and can't be cached separately, so it's a poor fit for anything more than a few KB.

### Can I convert Base64 back to an image?

Yes. Switch to 'Base64 to Image', paste a full data URI or the raw Base64, preview it, and download the decoded file.

### Does encoding change my image?

No. The original file bytes are read with FileReader and Base64-encoded verbatim — there's no canvas re-encode, so quality and format are untouched.

### Is my image uploaded?

No. Encoding and decoding happen locally in your browser; the image never leaves your device.

## Related tools

- https://offlineutils.com/image-compressor
- https://offlineutils.com/image-converter
- https://offlineutils.com/base64