Free Online Base64 Image Encoder

Base64 image encoding converts an image file (JPEG, PNG, GIF, WebP, SVG) into a `data:` URI you can embed directly in HTML, CSS, or JSON.

Your data is processed entirely in your browser and never sent to any server.

Instant results 100% private No signup needed
— or paste an existing data URI —

How to Use This Developer Tool

  1. To encode, click Choose file or drag an image onto the upload area.
  2. Copy the generated data:image/...;base64,... URI.
  3. To decode, paste an existing data URI to preview the image, MIME type, and size.
  4. Click Clear to reset the form.

What Is a Base64 Image Encoder?

Embedding a small image as a data URI saves an HTTP request — useful for inline SVG icons in CSS, transactional email signatures, and self-contained HTML snippets that need to render without external resources. The cost is size: Base64 inflates the binary by about 33%, and the URI lives inside the file rather than being cached separately by the browser.

The tool works in both directions. Upload an image to get its `data:image/…;base64,…` URI; paste an existing URI to preview the image and read its MIME type and decoded byte size. Both flows run entirely in your browser via the FileReader API — files don't leave your device.

Frequently Asked Questions

What image formats are supported?
JPEG, PNG, GIF, WebP, and SVG. The output includes the correct data:image/<type>;base64, prefix.
Can I preview a data URI?
Yes — paste an existing data URI to see the image, MIME type, and decoded byte size.
Is there a size limit?
Browser-based tools have memory limits. Very large images (several MB) may fail or be slow.

Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.

Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.

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