Base64 to Image Decoder
Instantly decode Base64 strings into viewable images. Analyze file size, dimensions, and download parsed images securely in your browser.
Base64 Input
Image preview will appear here
What is Base64 to Image Decoding?
Visualize encoded data strings instantly
Base64 to Image decoding is the process of converting a long string of alphanumeric characters back into a visual image file. Base64 is a text-based encoding scheme used to represent binary data (like images) in a format that is safe for transmission over text-based protocols like HTML, CSS, and JSON.
Developers often encounter Base64 strings when debugging APIs, inspecting database entries, or working with Data URIs in front-end development. While computers can read these strings easily, humans cannot "see" the image just by looking at the code.
Our Base64 to Image Decoder bridges this gap. It takes any valid Base64 string (with or without the `data:image/...` prefix) and instantly renders it in your browser. It also extracts vital metadata like the image's original dimensions, file size, and MIME type (PNG, JPG, SVG, etc.), allowing you to verify the data integrity before saving it as a file.
How to Decode Base64 Strings
Convert code to image in 3 simple steps:
Paste String
Paste your Base64 string into the input box. We support raw strings and Data URI formats.
Instant Preview
The tool automatically decodes the string and displays the image preview along with resolution details.
Download File
Save the decoded image to your device in its original format (PNG, JPG, WebP, etc.).
Why Use This Decoder?
Instant Rendering
No server uploads or waiting. The decoding happens instantly in your browser using JavaScript.
Multi-Format Support
Supports decoding for PNG, JPEG, GIF, WebP, BMP, and SVG formats automatically.
100% Secure
Your sensitive data strings never leave your computer. Ideal for decoding confidential tokens or private images.
Smart Cleaning
Automatically strips `data:image/...` headers and whitespace to ensure successful decoding even with raw data.
Error Detection
Identifies corrupted Base64 strings and provides feedback if the input is not a valid image encoding.
File Info
Instantly see the decoded image dimensions (width x height) and file size in KB/MB.
Pro Tips
- If your string doesn't render, check if it includes the prefix. Some decoding tools require
data:image/png;base64,while others just want the raw string. Our tool handles both! - Use this tool to recover images from JSON responses or database dumps where they are stored as text.
- For SEO, avoid using Base64 for large images. Always decode and save as a proper file (JPG/WebP) for your website's main content.
Who is This Tool For?
Full-Stack Developers
Debug API responses that send images as Base64 strings. Verify the data is correct visually.
Security Analysts
Decode data found in logs or suspicious payloads to check if they contain hidden images.
Frontend Developers
Extract icons or assets embedded in legacy CSS files back into usable image files.
QA Testers
Verify that the Base64 generation logic in your application is producing valid, renderable images.
Frequently Asked Questions
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data (like images or files) in an ASCII string format. It uses a set of 64 characters (A-Z, a-z, 0-9, +, /) to ensure data remains intact during transport over protocols that are designed to handle text.
How do I convert Base64 to an image?
Simply paste your Base64 string into the input field above. Our tool automatically detects the image format (PNG, JPG, etc.), decodes the string, and displays the image preview instantly. You can then download the image file to your computer.
Why is the Base64 string so long?
Base64 encoding increases the file size by approximately 33%. Every 3 bytes of binary data are encoded into 4 ASCII characters. For example, a 100KB image file will become roughly 133KB when converted to a Base64 string.
What image formats are supported?
This tool supports all standard web image formats including PNG, JPEG (JPG), GIF, WebP, SVG, BMP, and ICO. It automatically identifies the format from the Base64 header (e.g., data:image/png;base64) or the file signature.
Can I use Base64 images in HTML and CSS?
Yes. In HTML, use the img tag: 
. In CSS, use background-image: url('data:image/png;base64,...'). This allows you to embed images directly into your code, reducing the number of HTTP requests.
Is it safe to paste sensitive images here?
Absolutely. This tool runs entirely on the client-side within your browser. Your images and Base64 strings are processed locally using JavaScript and are never sent to our servers. Your data remains 100% private.
Why does my image fail to decode?
Common reasons include: 1) The string is truncated or incomplete. 2) The string contains hidden characters or whitespace (our tool attempts to clean this). 3) The input is not a valid image file but another file type. 4) The format is not supported by the browser (e.g., TIFF).
Does using Base64 affect website performance / SEO?
Using Base64 for small icons can improve performance by reducing HTTP requests. However, engaging in large-scale Base64 embedding significantly increases HTML size, which can slow down page parsing and negatively affect SEO. It also prevents images from being cached separately by the browser.
How can I copy the image to my clipboard?
Once decoded, click the 'Copy' button in the preview area. This copies the actual image data to your system clipboard, allowing you to paste it directly into applications like Photoshop, Slack, or Word. Note that SVG copy support depends on your browser.
What is the maximum string length supported?
There is no hard limit, but extremely large strings (e.g., 10MB+) may cause your browser tab to become unresponsive due to memory constraints. For strictly local large file conversion, performance depends on your device's RAM.