Base64 to Image

Paste any Base64-encoded image string and see the rendered image in your browser with this free Base64 to image converter online — no upload, no server, nothing leaves your device. Works with both full data URLs (data:image/png;base64,...) and raw Base64 strings, and automatically detects the image format.

When an API returns an encoded image field, when you need to verify a base64-embedded asset before deploying it, or when you're debugging a data URI in CSS — this tool renders it immediately and lets you download the result with one click.

How to Convert Base64 to Image

1. Paste your Base64 string into the input panel — either a full data URL starting with data:image/...;base64, or a raw Base64 string without any prefix.
2. Preview the image — it renders instantly on the right, showing dimensions, detected format, and encoded size.
3. Download the image — click Download to save it as a PNG, JPEG, WebP, or GIF file directly to your device.

The tool strips stray whitespace, line breaks, and JSON escape characters automatically, so you can paste directly from API responses or terminal output without pre-cleaning.

What Is a Base64 Data URL?

A Base64 data URL is a way to embed a binary file — like an image — directly inside a text document. Instead of linking to a separate file, you encode the raw image bytes as a Base64 string and prefix it with the MIME type:

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA...

This string can go directly into an HTML <img src="..."> attribute, a CSS background-image property, or a JSON field in an API payload. The browser decodes it on the fly and renders the image without any additional network request.

Supported Image Formats

PNG, JPEG, GIF, WebP, SVG, BMP, ICO — any format your browser can render natively. The tool auto-detects the format from the binary magic bytes in the encoded data, so you don't need to know the MIME type in advance when pasting raw Base64.

Common Use Cases

• Debugging API responses: Backend services often return avatar images, thumbnails, or document previews as Base64 strings inside JSON. Paste the field value here to verify the image looks correct before writing any display code.
• Validating CSS data URIs: When embedding icons or backgrounds inline in a stylesheet, paste the Base64 value here to confirm it decodes to the expected asset before committing.
• Recovering images from data exports: Some export formats (JSON, XML, database dumps) store images as Base64. Decode them here to extract and save the original image files.
• Inspecting email inline images: MIME emails often embed small images (logos, signatures) as Base64-encoded parts. Paste the encoded content to see the image without opening a mail client.
• Testing image encoding pipelines: After running an image through an encoding script or API, verify the output decodes correctly here before sending it downstream.
• Frontend development: When working with canvas APIs or file readers that output Base64, quickly confirm the encoded result is a valid, renderable image.

Frequently Asked Questions

Can I paste raw Base64 without the data: prefix?

Yes. The tool detects the image format automatically by reading the magic bytes at the start of the decoded data — 0xFF 0xD8 for JPEG, 0x89 0x50 for PNG, 0x47 0x49 for GIF, and 0x52 0x49 for WebP. You can paste raw Base64 and it will construct the correct data URL internally.

Why does my Base64 image not render?

The most common causes are: the string is incomplete (only a fragment was copied), there are non-Base64 characters embedded in the middle, or the data does not represent an image at all. Check that you copied the full Base64 value. If the data comes from a URL, it may use Base64URL encoding (- and _ instead of + and /) — try replacing those characters before pasting.

What is the maximum image size this tool can handle?

There is no hard limit imposed by the tool — the constraint is your browser's available memory. Modern browsers handle images up to hundreds of megabytes as blob URLs without issues. Very large images (over 50 MB encoded) may cause the browser tab to slow down while decoding.

Is my image data sent to any server?

No. All decoding and rendering happens locally in your browser using JavaScript's atob() and the browser's native Blob and Image APIs. Your data never leaves your device, and the tool works offline once the page is loaded.

What is the difference between a data URL and a blob URL?

A data URL (data:image/png;base64,...) embeds the entire file content inline as text — it can be very long and may hit browser limits for large files. A blob URL (blob:https://...) is a temporary in-memory reference created by the browser. This tool internally converts Base64 to a blob URL for rendering, which avoids size limits and is more memory-efficient.