Why is the Base64 larger than the file?

Base64 uses four characters for every three bytes, adding roughly a third to the size. It suits small icons; larger images are better served as files.

Does the pasted text need a data: prefix?

No. Common image formats are recognised from the start of the encoded data.

Are my files or data uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

Do I need to sign up or pay?

No. The site is completely free, needs no account and has no usage limits.

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🧬Image to Base64 Converter - Encode & Decode Images Online

Convert between images and Base64 in both directions. Upload an image to get a Data URI, raw Base64, a CSS background rule or an HTML <img> tag, each ready to copy — perfect for embedding small icons in web pages, email templates or JSON payloads. Going the other way, paste a Base64 string or Data URI and the tool detects the image type, previews it and lets you download it. Everything runs locally and nothing is uploaded.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Image to Base64

1Choose Image → Base64 and upload, or Base64 → Image and paste
2Pick the output format you need
3Copy the code, or preview and download the decoded image

FAQ

Why is the Base64 larger than the file?: Base64 uses four characters for every three bytes, adding roughly a third to the size. It suits small icons; larger images are better served as files.
Does the pasted text need a data: prefix?: No. Common image formats are recognised from the start of the encoded data.
Are my files or data uploaded?: No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.
Do I need to sign up or pay?: No. The site is completely free, needs no account and has no usage limits.