What is Base64 to Image Decoder?

A base64-to-image decoder that converts base64-encoded strings back into viewable and downloadable images. Supports all common image formats including PNG, JPEG, GIF, WebP, AVIF, BMP, ICO, and SVG.

Paste a Base64 string with or without a data URI prefix and the decoder figures out the format from the bytes themselves — PNG, JPEG, GIF, WebP, AVIF, BMP, ICO, or SVG. It then shows the rendered preview alongside dimensions, byte size, the detected format, and the input character count so you can verify the payload before you save or copy it.

How to use

1. Paste a base64-encoded image string (with or without the data URI prefix) into the input field.
2. The decoded image is displayed immediately with details like dimensions, format, and file size.
3. Download the decoded image file or copy it to clipboard for use in your projects.

When to use

• Verifying that a Base64 image returned by an API actually decodes to the expected picture.
• Extracting an embedded data URI from HTML or CSS source and saving it as a real PNG file.
• Recovering a screenshot pasted into a chat or log file as a Base64 blob you cannot otherwise open.

Result

A developer receives a base64-encoded PNG screenshot in an API response. They paste the string to verify it visually, then download the image file for their bug report.

FAQ

Do I need to include the data:image/...;base64, prefix in the input?

No. The decoder accepts both the bare Base64 payload and the full data URI. If you paste only the payload, it inspects the first decoded bytes — PNG starts with 89 50 4E 47, JPEG with FF D8 FF — and selects a format for you automatically.

Why does my paste say invalid Base64 even though it looks fine?

Three quiet sources of trouble. Stray whitespace or HTML-entity-encoded line breaks slipped into the payload, curly quotes pasted from a word processor, or a leading data URI prefix wrapped in extra quotes. We also auto-normalise URL-safe base64 (the dash and underscore variant used in JWTs), so that flavour no longer needs hand-conversion. Strip everything before the first character of the actual payload and make sure you copied straight ASCII, not smart quotes.

Can the decoder show me a transparent PNG correctly?

Yes. The preview area uses a neutral background so transparent pixels remain transparent rather than appearing solid white. The downloaded file is bit-for-bit identical to the original PNG, alpha channel and all.

Why is the rendered image blurry compared to the source?

The preview is scaled to fit the container, but the underlying image is decoded at its real pixel dimensions, which are shown in the result panel.

Is there a length limit on the Base64 input I can paste?

The page handles strings up to roughly 25 MB of text, which corresponds to about 18 MB of binary image data. Above that the decode can stall or run out of memory — for larger files use a dedicated decoder.

Related Tools