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NiuMa Tools Collection

Image Base64 Converter

Image Base64 Converter is a professional online image encoding tool that lets you quickly convert images to Base64 strings or restore Base64 data back to images for download. It runs fully on the client, keeping your data private, supports multiple image formats, and automatically detects Base64 mime types. Ideal for front-end development, API testing, email inline images and other scenarios, the tool provides live preview, dimension display, one-click copy and download features to streamline your Base64 workflow.

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Click to upload an image or drag it here

You can drag and drop image files directly to start converting

Supports JPG, PNG, WebP and more, maximum size 8 MB

Handy Tips

  • A Base64 string can be very long—use the download button to save it as a text file for safe keeping.
  • Base64 is ideal for embedding images directly inside HTML, CSS, JSON or API payloads—copy the result and paste it where you need it.
  • If the Base64 string has no data:image prefix, the tool falls back to PNG by default.

Key Features

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Instant Conversion

Runs 100% in your browser, delivering fast two-way conversion without uploading files.

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Rich Format Support

Handles JPG, PNG, WebP and other common formats while auto-detecting Base64 mime types.

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Developer Friendly

Built-in copy, download, size and dimension helpers streamline debugging and integration.

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Privacy First

Everything stays local in the browser—no network requests, no data leakage.

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WYSIWYG Preview

See both the image and the Base64 result instantly so you always know what you’re working with.

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Export Options

Save Base64 as text or download the decoded image with one click.

Use Cases

Front-end Debugging

Embed small images directly into CSS, HTML or JSON without extra HTTP requests.

API Testing

Decode Base64 responses returned by APIs to visually confirm the payload.

Emails & Docs

Inline images inside emails or documents to guarantee consistent rendering across clients.

Cross-platform Transfer

When file upload isn’t available, share images safely as Base64 text.

Data Archiving

Store Base64 strings for lightweight version control and diffing in text-based systems.

Education & Training

Demonstrate how Base64 works in web transmission with real-time encode/decode examples.

How to Use

1
Choose a mode: convert an image to Base64 or decode Base64 back to an image.
2
For image to Base64, upload or drag an image, review the file info, then click Convert.
3
Copy or download the generated Base64 string for use in code, APIs or documentation.
4
For Base64 to image, paste the encoded string and click Convert to preview and download the image.
5
Switch modes to process more files—every action happens locally in your browser.

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