Base64 to Image Decoder
Decode Base64 strings back to images instantly. Free online Base64 decoder supporting PNG, JPG, JPEG, SVG, GIF, WebP, BMP, and ICO formats. Preview and download your decoded images.
Paste Base64 String
📝 Base64 Input
Decoded Image
Your decoded image will appear here
Paste Base64 string to start
Supported Image Formats
Base64 Decoder Performance Metrics
How to Decode Base64 to Image
Step 1: Paste Your Base64 String
Copy your Base64 encoded image data and paste it into the input textarea. The tool accepts both plain Base64 strings and complete Data URI formats (with the data:image prefix). Use the paste button for quick clipboard access, or manually paste using Ctrl+V (Windows) or Cmd+V (Mac). The character counter helps you verify the string length.
Step 2: Select Input Format
Choose whether your input is a plain Base64 string or a Data URI format. Auto Detect (recommended) automatically identifies the format. Select Base64 Plain String if you have raw encoded data without prefixes, or Data URI if your string starts with "data:image/...". The tool intelligently handles both formats.
Step 3: Decode Automatically or Manually
With Auto Decode enabled (default), the image appears instantly after pasting your Base64 string. The decoder processes the data, validates it, and displays the reconstructed image in the preview area. If auto-decode is disabled, click the Decode Image button to manually trigger the conversion. Real-time decoding provides immediate visual feedback.
Step 4: Download or Copy Results
Once decoded, view comprehensive image information including format, file size, dimensions, and MIME type. Click Download Image to save the reconstructed image to your device in the original format. Use Copy Data URI to copy the full data URI string back to your clipboard for reuse in HTML, CSS, or JavaScript code.
Key Features
Universal Base64 Decoder
Decode any Base64 encoded image string back to its original format. Supports PNG, JPG, JPEG, WebP, GIF, SVG, BMP, and ICO formats with perfect accuracy. Works with both plain Base64 strings and complete Data URI formats.
Instant Preview
See your decoded image immediately in the browser without downloading. Real-time preview lets you verify the image content, check quality, and confirm the decoding worked correctly before saving to your device.
Auto Format Detection
Intelligent format detection automatically identifies whether your input is a plain Base64 string or a Data URI. No need to manually specify the format—just paste and the tool handles the rest with smart parsing algorithms.
Detailed Image Info
View comprehensive details about the decoded image including exact dimensions, file size, image format, and MIME type. This metadata helps you verify image specifications and understand the characteristics of the decoded file.
Lightning Fast Decoding
Convert Base64 strings to images in milliseconds with our optimized decoding engine. All processing happens instantly in your browser using native JavaScript APIs, ensuring maximum speed without server round trips.
Complete Privacy
Your Base64 data and decoded images never leave your device. All decoding happens client-side in your browser with no server uploads, ensuring absolute privacy for confidential images, sensitive documents, and proprietary graphics.
Common Use Cases
🔍 Testing & Debugging
Verify Base64 encoded images in your code by decoding and previewing them. Perfect for debugging email templates, testing API responses, or validating image data stored in databases. Quickly spot encoding errors or corrupted data.
📧 Email Development
Extract and save images from HTML email templates that use Base64 encoding. Decode embedded images to update, modify, or optimize them separately before re-encoding for production email campaigns.
🗄️ Database Recovery
Recover images stored as Base64 strings in databases. Export Base64 data from JSON fields, NoSQL documents, or SQL text columns, then decode and save as standard image files for archiving or migration to file storage systems.
🔌 API Testing
Decode Base64 image data from API responses to verify that images are transmitted correctly. Test REST APIs, GraphQL queries, or webhook payloads that return Base64 encoded images as part of JSON responses.
📱 Mobile App Development
Extract images from mobile app configurations or local storage where images are stored as Base64. Useful for debugging hybrid apps, progressive web apps, or React Native applications that cache images as encoded strings.
📄 Document Extraction
Extract images embedded in HTML documents, XML files, or JSON configurations. Convert Base64 image references back to standard image files for editing, archiving, or converting to different formats.
Frequently Asked Questions
Understanding Base64 Decoding
How Base64 Decoding Works
Base64 decoding is the reverse process of Base64 encoding. It converts ASCII text strings back into binary data (like image files). The decoder reads groups of 4 Base64 characters and converts them back to 3 bytes of binary data. This process reconstructs the original image file from its text representation.
The decoding algorithm uses a lookup table that maps each Base64 character (A-Z, a-z, 0-9, +, /) back to its 6-bit binary value. Four consecutive Base64 characters represent 24 bits (4 × 6 bits), which are reassembled into three bytes (3 × 8 bits) of the original binary data. Padding characters (=) indicate that the final group had fewer than 3 bytes.
Base64 Character Set
The Base64 alphabet consists of 64 characters:
- A-Z (uppercase letters): values 0-25
- a-z (lowercase letters): values 26-51
- 0-9 (digits): values 52-61
- + (plus sign): value 62
- / (forward slash): value 63
- = (equals): padding character