Base64 Decode Image

Decode Base64 strings back to images

Image Tools

Paste a Base64 string or data URI (data:image/...;base64,...). Images are processed in your browser - nothing is uploaded to any server.

Base64 String or Data URI

Turn a Base64 string into an image

Paste a Base64 string or a whole data URI and press Decode Image, or Ctrl+Enter in the box. The decoder shows the picture with its format, size in pixels and approximate file size, and Download Image saves it as a file.

Copy Image puts the picture on the clipboard, ready to paste into a chat, a document or an image editor. Browsers copy PNG images reliably; for other formats, use Download Image.

Need the string from an image file?

The encoder turns any image into a Base64 string and a data URI, and shows how much bigger the text is.

How the image format is detected

A data URI names its type, so the decoder uses it as it is. For a raw string it looks at the first characters, which are the file's signature in Base64:

String starts with	Format	Saved as
`iVBORw0KGgo`	PNG	decoded-image.png
`/9j/`	JPEG	decoded-image.jpg
`R0lGOD`	GIF	decoded-image.gif
`UklGR`	WebP	decoded-image.webp
`PHN2Zy`	SVG	decoded-image.svg

Anything else is tried as PNG. An SVG file that starts with an XML declaration begins with PD94bWwg instead and isn't recognised: paste it as a data URI starting with data:image/svg+xml;base64,.

When a Base64 image won't decode

Most failures come from how the string was copied, not from the image:

Problem
Copied from JSON, the string contains \/

Fix
JSON may escape every slash. Replace \/ with / before pasting.
Problem
The string uses - and _

Fix
That is URL-safe Base64, used in tokens and URLs. Swap - for + and _ for /.
Problem
Only part of the string was copied

Fix
Long strings get cut off in logs, terminals and chat previews. Copy the whole value again from the source file.
Problem
The data is not an image

Fix
Base64 of text, a PDF or a font decodes to bytes the browser can't show as a picture, and the decoder says the input is invalid.

Base64 to image questions

decoded-image with the extension of the detected format, such as decoded-image.png. Rename the file after saving.

About three quarters of the Base64 length, because 4 characters hold 3 bytes. The size under the preview is that estimate, marked with ~.

No. Browsers skip spaces and line breaks inside Base64 data, so a string wrapped at 76 characters, as in email, decodes as it is.

No, one string at a time. Decode Another clears the box for the next one.

No. Decoding happens in your browser, and the image never leaves your device.