What is Base64 decoding for images?

Base64 decoding converts a text-encoded image string (starting with data:image/...) back to a binary image file you can view and download.

What formats does the Base64 string need to be in?

Paste a full data URI — for example: data:image/png;base64,iVBORw0KGgo... The tool automatically detects the image type from the MIME prefix.

What if my Base64 string has no data URI prefix?

If you have a raw Base64 string without the data:image/... prefix, the tool will attempt to decode it as PNG by default. You can also manually prepend the correct MIME prefix.

Yes — completely free, no account required, no file size limits. The decoding runs in your browser using the atob() API.

Base64 Image Decoder — zero upload, instant preview

Base64 decoder for images — free, instant.

Decode any Base64-encoded image string back to its original file. Preview in the browser and download — all in one step.

No signup required

100% private

Runs in browser

Supports data URI & raw

Supports full data URIs or raw Base64 strings (defaults to PNG if no MIME prefix).0 characters

Output Format

Image Preview

Waiting for input

Your decoded image will appear here

Paste a Base64 string and click decode to preview the image.

Image Info

Dimensions–

File size–

Format-

Instant decoding

Get your image in seconds.

100% private

Everything runs in your browser.

No upload required

Your data never leaves your device.

Supports all formats

Works with PNG, JPG, WebP and more.

What is Base64?

Base64 is a text-based encoding format that converts binary data (such as images) into a string of ASCII characters. It's commonly used in web development to embed images directly in HTML, CSS or JSON.

Learn more

Need to encode an image instead?

Convert your image to a Base64 string with our image encoder tool — also free and browser-based.

Go to Image to Base64

Frequently asked questions

How do I decode a Base64 string to an image?

Paste the Base64 string (with or without the data:image/... prefix) into the text area and click "Decode Image." The decoded image appears instantly in the preview panel. Download as PNG or JPG.

What is the difference between a data URI and raw Base64?

A data URI includes a MIME type prefix like "data:image/png;base64," followed by the encoded data. Raw Base64 is just the encoded characters without the prefix. Trndinn supports both — if no prefix is detected, it defaults to PNG.

Is there a size limit for Base64 decoding?

There's no hard limit in Trndinn since processing happens in your browser. Very large strings (10MB+) may be slow depending on your device. For typical images (under 5MB encoded), decoding is instant.

Is my Base64 data safe?

Yes. Everything runs locally in your browser — your Base64 string is never sent to any server. This makes it safe for decoding sensitive images like screenshots of private data or API responses.

Need more?

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Trndinn's Base64 to Image Decoder is a free, browser-based tool. All processing happens locally on your device — no files are uploaded to any server. No signup, no watermark, no usage limit.