Base64 to Image Converter
Decode any Base64 encoded string or data URI back into a viewable and downloadable image file. Paste the Base64 string from an API response, HTML source, CSS file, or database, preview the decoded image, and download it as JPG, PNG, or WebP. Useful for developers debugging APIs, extracting embedded images from source code, or working with image data in text formats.
How to Use Base64 to Image Converter
- 1
Paste the Base64 string
Paste your Base64 encoded string into the text area. This can be a full data URI (starting with data:image/...) or a raw Base64 string without the prefix.
- 2
Specify MIME type (if raw Base64)
If you pasted a raw Base64 string without a data URI prefix, select the image type (JPG, PNG, WebP) so the decoder knows how to interpret the data.
- 3
Decode
Click the Decode button. The Base64 string is converted back to image data and rendered as a preview in the browser.
- 4
Download
Download the decoded image in your preferred format. The image file is exactly as it was before it was Base64 encoded.
When to Use This Tool
Quick Reference
About Base64 to Image Converter
The Base64 to Image converter decodes a Base64-encoded string back into a viewable and downloadable image file. If you receive image data embedded in a JSON API response, HTML data URI, CSS stylesheet, or database record, this tool extracts and renders the actual image so you can preview and download it — no command-line decoding required.
This tool is most useful for:
- Debugging API responses that embed images as Base64 data URIs
- Extracting images embedded in HTML or CSS source code
- Converting database-stored Base64 image blobs back to viewable files
- Recovering images from email attachments encoded as Base64 MIME parts
- Testing and validating Base64 image encoding in web development workflows
Base64 encoding converts binary image data into a string of ASCII characters using a 64-character alphabet. Each group of 3 bytes in the original binary becomes 4 characters in Base64, resulting in encoded strings that are approximately 33% larger than the source image. This tool reverses the process: it reads the Base64 string, decodes each 4-character group back to 3 bytes, and reconstructs the original binary image data. The browser then renders this binary data as a visible image using a data URI scheme.
Input: Paste any valid Base64 string — with or without the data:image/png;base64, prefix. Supported encoded formats: JPG, PNG, GIF, WebP, SVG, BMP, ICO. Output: the decoded image rendered in the preview, downloadable as its original format. Maximum input string length: 50 MB of Base64 text (decodes to approximately 37 MB image).
All decoding happens entirely in your browser using JavaScript's built-in atob() function and the FileReader API. No data is sent anywhere. This is important for developers working with sensitive API responses or proprietary image data — your Base64 strings are never transmitted over a network connection. For the reverse operation, use the Image to Base64 Encoder.
Pro Tips for Base64 to Image Converter
If the tool shows an error, check for whitespace or line breaks in your Base64 string — copy-pasting from some editors adds invisible newline characters that break the encoding.
Base64 strings from data URIs start with "data:image/...;base64," — you can paste the full URI including this prefix, the tool strips it automatically.
To quickly test if a string is valid Base64, check that its length is divisible by 4 and it ends in "=" or "==" padding characters.
For large Base64 strings from API responses, use browser DevTools Network tab to copy the full response body rather than the displayed preview which may be truncated.
Frequently Asked Questions
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