Skip to main content
Bethemesh
Images & graphics

Image ⇄ Base64

Encode an image to Base64 or decode a Base64/Data URI string into an image entirely in your browser.

Embed this widget

Customize the result, check the live preview, then copy the code.

Preview

Embed code type

Code to copy

Responsive and automatically resized by Bethemesh.

  • 100% local
  • Instant
  • Free
  • No account
  • Works offline
  • Clipboard

Your files are processed locally in your browser and are never sent to our servers.

Drop your file here

Recommended size: up to 25 MB

Preview

Base64 / Data URI

Why use this tool?

Convert an image to Base64/Data URI or rebuild an image from a Base64 string directly in your browser without uploading the source file.

100% local and secure

Your data stays on your device and is never sent to our servers.

Smart processing

Prepare and transform images directly in your browser without additional software.

Supported formats

Common image formats with export options provided by the tool.

Save time

Get a clean, ready-to-use result in seconds without installing software or configuring a complex workflow.

Fonctionnement

How does this tool work?

The tool works in both directions. When encoding, your browser reads the image file and produces a Data URI containing the MIME type and Base64 data, ready to copy into code or configuration. When decoding, you can paste either a complete Data URI or raw Base64, choose the MIME type when needed, preview the reconstructed result, and download it as an image. Every step runs locally on your device.

Use cases

Embed a small image

Turn an icon or lightweight graphic into a Data URI for direct use in HTML, CSS, templates, or configuration files.

Decode received data

Preview a Base64 string returned by an API, export, log, or configuration before saving it back to an image file.

Debug an exchange

Confirm that an encoded payload or Data URI produces the expected image during development, testing, or troubleshooting.

Guide

How to use this tool

  1. 1

    Choose direction

    Switch between Image → Base64 and Base64 → Image depending on the task.

  2. 2

    Add the source

    Upload an image or paste a Base64 string or complete Data URI.

  3. 3

    Copy or download

    Copy the generated text or download the decoded image file.

Tips and best practices

  • A Data URI already contains its MIME type, while raw Base64 does not.
  • Base64 increases data size by roughly one third compared with the original binary content.
  • Avoid embedding very large Base64 images in web pages because they can make the document unnecessarily heavy.

Frequently asked questions

What is the difference between Base64 and a Data URI?

Base64 represents binary data as text. A Data URI wraps that text with metadata such as the MIME type and the data: prefix.

Are my images uploaded to a server?

No. File reading, encoding, decoding, preview, and download all happen locally inside your browser.

Can I decode Base64 without a data: prefix?

Yes. Paste the raw Base64 string and select the matching MIME type so the browser can reconstruct the image correctly.

Was this tool useful?

Read next

GuideBest practicesBeginner

Convert a PDF to images or images to PDF

Learn what changes when PDF pages are rasterized, how resolution and image format affect quality, and when to assemble images into a PDF.

29 August 20262 minRead

Recommended workflow

Continue your processing

Discover tools that naturally fit before, after, or alongside this one.

Complementary tools

Images & graphics

Create a GIF from images

Combine multiple images into an animated GIF directly in your browser.

100% localNew
Use this tool
Images & graphics

Convert and compress an image

Convert an image to PNG, JPEG, or WebP and adjust output quality before download.

100% localFeatured
Use this tool
Images & graphics

SVG to PNG converter

Turn an SVG into PNG, JPEG, or WebP with custom dimensions and background.

100% local
Use this tool