Base64 Image Decoder — Preview & Download Images Online Free

Base64 Image Decoder — Preview & Download Images Online Free. Free online Base64 image decoder. Paste any Base64 string or Data URI to instantly preview and download your image — PNG, JPG, SVG, GIF, and more.

Instantly visualize and extract images from Base64 strings with our free online Base64 image decoder. Paste any Base64-encoded image or Data URI and see the image preview immediately — no upload, no signup.

Perfect for frontend developers debugging embedded CSS assets, backend engineers inspecting API payloads, or anyone recovering images from HTML/JSON source. Supports PNG, JPEG, GIF, SVG, and WebP. Related: Base64 File Converter, Base64 String Converter.

Our base64 to image converter runs entirely in your browser — your image data never leaves your device. Paste your Base64 string with or without the data:image prefix and our tool handles it automatically. Download the decoded image with one click.

100% free, private, and works offline.

Frequently asked questions

How do I convert Base64 to an image?

Paste the encoded string into the Base64 String / Data URI box. The picture appears in the Image Preview area as soon as it can be decoded, and the Download Image button saves it to your device.

Do I need the data:image prefix?

No. You can paste a full data URI such as data:image/png;base64,iVBOR... or just the raw Base64. Without a prefix the tool decodes the first bytes and recognises PNG, JPEG, GIF, WebP, SVG, BMP, ICO, TIFF and AVIF by their signature; anything else is treated as PNG.

Why is the preview blank or showing a broken image?

The string is probably incomplete, contains extra characters such as quotes or a trailing comma copied from JSON or CSS, or is not image data. Make sure you copied the whole value, and if it has a prefix, check that it starts with data:image/. For PDFs and other files, use the Base64 File Converter.

What file name and format does the download use?

The image is saved as decoded-image with the extension that matches its detected type, for example decoded-image.png, decoded-image.jpg, decoded-image.webp or decoded-image.svg. The data is not re-encoded, so the file keeps its original format and quality.

Is my image data uploaded?

No. Decoding and the preview happen in your browser using a data URL, so the Base64 string and the image never leave your device.

How to use this online tool

Base64 Image Decoder — Preview & Download Images Online Free is designed for fast browser workflows when you need to format, validate, convert, decode, encode, generate, or inspect data without opening a heavy desktop app. Start with the input field or visible options, review the result, then copy or download the output for the next step.

Private processing in your browser

Base64 Image Decoder — Preview & Download Images Online Free keeps the normal processing step local in your browser. That is useful for code snippets, tokens, documents, configuration values, text samples, and other material that should not be sent to a remote service unless you explicitly choose to share it.

When this tool is useful

Use Base64 Image Decoder — Preview & Download Images Online Free for repeatable developer tasks, technical documentation, QA checks, quick conversions, debugging, content cleanup, and internal team workflows. The page focuses on clear inputs, immediate feedback, and output that is easy to reuse in code, reports, tickets, emails, or notes.

Practical tips

Before copying the final result, check important details such as spacing, casing, filenames, encoding, token structure, line breaks, or output format. Small checks prevent mistakes when the result is reused in source code, API requests, documentation, spreadsheets, or shared files.