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Base64 to Image

Paste a Base64 data URI and get the image back in your browser — preview it, then download.

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Quick Answer

Base64 to Image takes a Base64 string — ideally a full data URI like data:image/png;base64,... — and turns it back into a viewable, downloadable picture, all in your browser. Paste it, hit render, and the image appears; if you paste raw Base64 without the data: prefix, the tool assumes PNG. Decoding is exact and lossless, and nothing is uploaded.

What the Base64 to Image Does

When you have an image trapped as a Base64 blob — copied from some code, a CSS file, an API response, or our Image to Base64 tool — this turns it back into an actual image you can see and save. Paste the string, and it renders on the spot.

It is the exact reverse of encoding: the Base64 text is decoded back to the original bytes, so the picture you get is identical to the one that was encoded. No quality is lost in the round trip.

How It Works

The tool takes whatever you paste and points an image element at it. If the text already starts with data:, it is used as-is; if it is raw Base64 with no prefix, the tool wraps it as data:image/png;base64,... so the browser knows how to read it.

If the data is valid, the browser decodes and displays the image immediately. The download button saves it (named image.png); if the string is malformed, you get a clear invalid-Base64 message instead of a broken file.

Processing pipeline

  1. Step 1. Paste a Base64 string — a full data URI, or raw Base64 (assumed to be PNG).
  2. Step 2. Click Render; the tool points an image element at the data.
  3. Step 3. If valid, the picture displays instantly; if not, an error message appears.
  4. Step 4. The decode is lossless — the exact bytes that were encoded.
  5. Step 5. Download the result, saved as image.png.

Privacy

Whatever you paste stays in your browser. The string is decoded and rendered locally — nothing is sent to a server, and there is no account or history.

Close or refresh the tab and the pasted data and the image are gone from memory, so it is safe for private or proprietary images.

Technical Details

EngineBrowser image decoder (data: URI)
InputFull data URI, or raw Base64 (assumed PNG)
OutputRendered image + download (image.png)
DecodingLossless — exact original bytes
ValidationShows an error on malformed data
UploadNever — runs in your browser

Standards & references

  • RFC 2397 (data: URL scheme) — the data:[mediatype][;base64],data syntax the tool reads; a full data URI carries its own MIME type.
  • RFC 4648 (Base64) — the encoding being decoded — 4 text characters back to 3 bytes, exactly reversing the original.
  • HTML image decoding — the browser natively decodes the data URI when it is set as an image source, so no library is needed.

Accuracy & Limitations

Decoding is exact and lossless — you get back the precise bytes that were encoded, so the image is identical to the original. Nothing is re-compressed.

Paste the whole data URI when you can. The data: prefix carries the real format (PNG, JPEG, WebP, SVG); if you paste only the raw Base64, the tool assumes PNG, which usually still renders because browsers sniff the actual bytes — but the full URI is the reliable route.

The download is always named image.png regardless of the true format. The bytes inside are whatever was encoded, so a JPEG data URI still downloads correct image data — just rename the extension if you need it to match.

If the string is incomplete, corrupted, or not actually an image, the tool cannot render it and shows an invalid-Base64 message rather than failing silently. Stray spaces or line breaks from copying are the usual culprits.

Real-World Use Cases

Inspect an inlined image

See what a data: blob in some HTML or CSS actually contains.

Recover an image from code

Pull a picture out of an API response, config file, or export that stored it as Base64.

Round-trip check

Verify a string from the Image to Base64 tool decodes back correctly.

Save an embedded asset

Turn an inline icon back into a normal image file you can use elsewhere.

When to use it — and when not to

Good for

  • Decoding a data URI back to an image
  • Inspecting or saving an inlined image
  • Recovering Base64 from code or an API
  • Confirming an encode round-trips

Not the best choice for

  • Encoding an image to Base64 (use the reverse tool)
  • Fixing a truncated or partial string
  • Bulk-decoding many strings at once
  • Guaranteeing the right file extension

To go the other way, use Image to Base64; if a paste will not render, check it is not truncated and includes the full data: prefix.

Frequently Asked Questions

What should I paste?
Ideally a full data URI, like data:image/png;base64,iVBOR.... You can also paste raw Base64 with no prefix, and the tool will assume it is a PNG.
Does decoding lose any quality?
No. Base64 decoding returns the exact original bytes, so the image is identical to the one that was encoded — the round trip is lossless.
It says invalid Base64 image data — what is wrong?
The string is usually truncated, corrupted, or not an image. Copying often introduces stray spaces or line breaks; make sure you have pasted the complete string, including the data: prefix if it had one.
Why does the download come out as image.png?
The tool names every download image.png. The bytes are whatever was encoded, so a JPEG still downloads as valid image data — just rename the file extension if it needs to match the real format.
Do I need the data: prefix?
It is best to include it, because it tells the browser the real format. Without it, the tool assumes PNG; that often still works because browsers detect the actual format, but the full data URI is the reliable choice.
Is anything uploaded?
No. The string is decoded and the image is rendered entirely in your browser. Nothing is sent to a server, and refreshing clears it from memory.
Can it handle JPEG, WebP, or SVG data URIs?
Yes. A full data URI carries its own MIME type, so JPEG, WebP, SVG, and PNG all render. Only when you paste raw Base64 with no prefix does the tool assume PNG.
Can I decode several strings at once?
No — it renders one pasted string at a time. Paste the next one to decode it.
Where do these Base64 strings come from?
Usually from inlined images in HTML or CSS, API responses, configuration files, or an encoder like our Image to Base64 tool.
Is my pasted data private?
Yes. It is processed locally in your browser and never sent anywhere, so it is safe for private images.

References

Written from how the tool really decodes a data URI — including the raw-Base64-assumed-PNG behavior and the always-image.png download.

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