How do I convert a Base64 string back to an image?

Paste the Base64 string (with or without the data:image/...;base64, prefix) and the tool decodes it, displays a preview, and lets you download the original image file.

Why is my Base64 string not converting?

Common causes: the string was truncated when copied, line breaks or spaces were inserted, the data URI prefix is malformed, or characters were URL-encoded (+ became %2B). The decoder tolerates whitespace and auto-detects the prefix.

Can the tool detect the image format automatically?

Yes — if the data URI prefix is present it declares the format; otherwise the decoder inspects the file signature bytes (PNG, JPEG, GIF, WebP magic numbers) to identify the type.

Is there a size limit for decoding?

Only your browser's memory. Typical embedded images decode instantly; multi-megabyte strings work but may take a moment to render.

Is the decoded image private?

Yes — decoding happens entirely in your browser. The Base64 string and resulting image never touch a server.

Base64 to Image Converter — Free Online Base64 Decoder

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Base64 to Image Converter — Decode, Preview, Download

You've found a Base64 blob in an API response, a database column, an email source, or a CSS file — and you need to see the actual image. Paste it here: this free decoder converts any Base64 string back into a viewable, downloadable image instantly, auto-detecting the format from the data URI prefix or the file's magic bytes. Everything runs in your browser; nothing is uploaded.

Where Base64 Images Hide

API responses — endpoints returning avatars, thumbnails, QR codes, or generated charts inline in JSON.
Databases — legacy schemas storing images in TEXT columns.
Email source — embedded signatures and logos in MIME parts.
HTML/CSS — data URIs in img tags and background-image rules.
Mobile and IoT payloads — camera captures transmitted over JSON APIs.

Troubleshooting Failed Decodes

Truncated string: Base64 length must be a multiple of 4 (with = padding). A copy that cut off mid-string won't decode — grab the full value. URL-encoded characters: if the string traveled in a URL, + may have become %2B and / became %2F; the decoder normalizes common cases. Wrong prefix: a PNG declared as image/jpeg still decodes — the tool trusts the magic bytes (\x89PNG, \xFF\xD8\xFF for JPEG) over the label. Leading junk: stray whitespace or newline characters before the data are stripped automatically.

Format Detection by Magic Numbers

Format	First bytes
PNG	89 50 4E 47
JPEG	FF D8 FF
GIF	47 49 46 38
WebP	52 49 46 46 ... 57 45 42 50

This byte-signature check is how the tool names your download correctly even when the data URI prefix is missing or wrong.

Free and Private

No signup, no server contact, no size limits beyond browser memory. Pairs with our Image to Base64 converter for full round-trip testing of embedded-image workflows.

Base64 To Image

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