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Free Base64 to Image Converter

Paste a Base64 string or data URI and instantly preview and download the image it represents. Decoding runs entirely in your browser.

Runs entirely in your browser — nothing is uploaded to a server.

Quick answer

To convert Base64 to an image, decode the text back into the original bytes and treat it as a picture. This tool accepts either a full data URI (data:image/png;base64,…) or just the Base64 part, validates that it really decodes to an image, shows a preview, and lets you download it. Everything stays in your browser.

Formula & method

The tool detects whether your input already has a data:<mime>;base64, prefix; if it's raw Base64 it assumes a PNG container. It then loads the data URI into an image element to confirm it decodes to a valid picture before showing a preview and offering a download, so a truncated or malformed string is caught instead of producing a broken file.

Examples

Example 1: Decode a data URI
Input
data:image/png;base64,iVBORw0K…
Result
Preview + download PNG
Why
The mime type in the prefix tells the tool exactly what kind of image it is.
Example 2: Raw Base64 only
Input
iVBORw0KGgoAAAANS… (no prefix)
Result
Treated as PNG, preview shown
Why
Without a prefix the tool assumes a PNG container, which covers most pasted strings.
Example 3: Catch a bad string
Input
Truncated Base64
Result
Clear error message
Why
The tool loads the image to validate it, so incomplete data is reported rather than silently failing.

When to use this tool

  • Previewing an image embedded as Base64 in code, JSON, or an API response.
  • Extracting an inlined data-URI image back into a real file.
  • Verifying that a Base64 string you generated is complete and valid.

Common mistakes

  • Pasting only part of a very long Base64 string — if it's truncated, the image won't decode.
  • Including surrounding quotes or url(...) wrapper text copied from CSS, which breaks the decode; paste just the data URI.
  • Assuming a raw string is JPG — without a prefix it's decoded as PNG; add the correct data:image/jpeg;base64, prefix if needed.

Frequently asked questions

Do I need the data:image prefix?

Not necessarily. If you paste a full data URI the tool reads its mime type; if you paste raw Base64 it assumes PNG. For JPG or WebP raw strings, add the matching prefix for an accurate result.

Is anything uploaded?

No. The Base64 is decoded entirely in your browser, and the resulting image never leaves your device.

Why does it say my string isn't a valid image?

The tool actually loads the decoded data to verify it. If it fails, the string is usually truncated, contains stray characters, or isn't image data at all.

What format will the download be?

It matches the data URI's mime type — PNG, JPG, or WebP. Raw Base64 without a prefix downloads as PNG.

Can it handle very large Base64 strings?

Yes, within your browser's memory. Extremely large strings may be slow to paste, but decoding itself is instant once the text is in the box.

How do I create Base64 from an image?

Use the Image to Base64 tool — it encodes any image into a data URI with copy-ready CSS and HTML snippets.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

  • ✓ Free to use
  • ✓ No sign-up required
  • ✓ Runs entirely in your browser — nothing is uploaded.
  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

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