Image ↔ Base64 Converter — Private Browser-Based Encoding (No Upload Required)

IMAGE ↔ BASE64

Drop images here
Supports JPG, PNG (Max: 50MB per file)
Processing...
Conversion Complete!
Image Generated!
Supported Formats
Image JPG, PNG Binary format Encode Decode Base64 Text string Web-safe Base64 encoding converts binary data to ASCII text for easy transfer
Privacy & Security

This converter operates entirely within your browser using the JavaScript FileReader API. Your images are processed locally on your device — no data is transmitted to any server. The encoding and decoding algorithms run in your browser's memory, and all temporary data is cleared when you close or refresh the page.

0 Server Uploads
100% Local Processing
Instant Conversion Speed
Private Data Handling

Encoding Process

Base64 encoding transforms binary image data into a text string using 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). This allows binary content to be safely embedded in text-based formats like HTML, CSS, JSON, and XML without corruption.

1
Binary Reading
Image file is read as raw binary data (8-bit bytes)
2
Bit Grouping
Every 3 bytes (24 bits) are split into 4 groups of 6 bits each
3
Character Mapping
Each 6-bit value (0-63) maps to a character in the Base64 alphabet
4
Padding
If input bytes aren't divisible by 3, "=" padding characters are added
Output Size Formula
Output Size = ⌈(Input Size × 4) / 3⌉ + Padding
Base64 encoding increases file size by approximately 33%

Supported Formats

Direction Input Format Output Format MIME Type
Image → Base64 JPEG (.jpg, .jpeg) Base64 text string image/jpeg
Image → Base64 PNG (.png) Base64 text string image/png
Base64 → Image Base64 string / Data URL PNG file image/png
Base64 → Image Base64 string / Data URL JPEG file image/jpeg

Technical Specifications

Maximum File Size
50 MB per file
Batch Processing
Multiple files supported
Input Formats
JPEG, PNG
Output Options
Raw Base64, Data URL
Size Overhead
~33% larger than original
Download Format
TXT file with Base64

Data URL Structure

The converter generates both raw Base64 strings and complete Data URLs. Data URLs include the MIME type prefix, making them directly usable in HTML and CSS.

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEA...
├─ scheme: data:
├─ MIME type: image/png
├─ encoding: ;base64,
└─ encoded data: iVBORw0K...

Conversion Examples

HTML Image Embedding
Convert PNG logo → embed directly in <img src="data:image/png;base64,..."> without external file
CSS Background Images
Convert small icon → use as background-image: url(data:image/png;base64,...) inline
Email Templates
Convert JPEG header image → embed in HTML email to avoid blocked external images
JSON API Payloads
Convert user avatar PNG → include as Base64 string in JSON request body
SVG Image Embedding
Convert raster image → embed in SVG file using xlink:href with Data URL
Markdown Documents
Convert diagram PNG → embed in markdown using ![alt](data:image/png;base64,...)
Database Storage
Convert thumbnail JPEG → store as text field in database without binary handling
QR Code Recovery
Decode Base64 string from API response → download as PNG image file
Clipboard Integration
Convert screenshot PNG → copy Data URL to paste directly into code editor
Signature Extraction
Decode Base64 signature from electronic document → save as JPEG file

Size Impact Reference

Original Size Base64 Size Increase Typical Use Case
1 KB ~1.37 KB +37% Small icons, favicons
10 KB ~13.7 KB +37% UI elements, buttons
100 KB ~137 KB +37% Thumbnails, avatars
1 MB ~1.37 MB +37% Medium photos
10 MB ~13.7 MB +37% High-resolution images

Note: Base64 encoding is recommended for images under 10 KB for inline embedding. Larger images benefit from traditional file hosting to reduce page load times.