Base64 Encoder / Decoder
Advanced Base64 tool with live encoding, binary file support, URL-safe mode, and more.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII text format using 64 printable characters (A-Z, a-z, 0-9, +, /). It's commonly used to encode data that needs to be transmitted over media designed to handle text, such as email, JSON, XML, and URLs.
Base64 encoding takes groups of three bytes (24 bits) and represents them as four 6-bit groups, mapping each group to one of 64 characters. This makes binary data safe for text-based protocols and ensures data integrity during transmission.
Advanced Features That Beat the Competition
⚡ Live Encoding Mode
Real-time encoding/decoding as you type with smart 300ms debouncing. Toggle on/off with prominent button below mode selector.
📝 Line-by-Line Processing
Encode or decode each line separately - perfect for batch processing multiple values at once.
📁 Binary Files up to 100MB
Upload and encode ANY file type - images, PDFs, videos, executables. Same 100MB limit as premium tools.
🌍 50+ Character Encodings
UTF-8/16, ISO-8859 (all variants), Windows (874-1258), Chinese (GBK, Big5), Japanese (Shift_JIS, EUC-JP), Korean, Cyrillic, and more - beating all competitors!
🔗 URL-Safe Base64 (RFC 4648)
One-click toggle for URL-safe encoding using - and _ characters, perfect for URLs and filenames.
📏 MIME Line Wrapping
Format output with 64 or 76 character line breaks following RFC 2045 MIME standards.
⌨️ Power User Shortcuts
Ctrl+Enter (process), Ctrl+K (copy), Ctrl+S (download), Ctrl+L (clear) - works on Mac with Cmd key.
✅ Real-time Validation
Instant visual feedback with green checkmark or red alert icon showing Base64 validity.
📜 History & Recovery
Automatic history tracking of last 20 conversions with localStorage - never lose your work.
🔄 Newline Format Control
Choose Unix (LF) or Windows (CRLF) newline format for cross-platform compatibility.
Common Uses for Base64 Encoding
📧 Email Attachments
Encode binary files to safely transmit them in email messages and prevent corruption during transfer.
🌐 Data URLs
Embed images, fonts, and other files directly in HTML/CSS using data: URIs with Base64 encoding.
🔐 Authentication
Encode credentials for HTTP Basic Auth headers and API tokens in a text-safe format.
📦 JSON/XML Data
Store binary data within JSON or XML documents without special character conflicts.
How to Use This Tool
- Choose mode: Select "Encode" or "Decode" using the buttons above
- Enable live mode: Toggle the prominent "Live Mode" button for real-time results
- Configure settings: Click settings icon to customize encoding type, character set, line wrapping, and more
- Input your data: Type text, paste Base64, or upload text/binary files (up to 100MB)
- View results: See instant output with validation indicators and size statistics
- Use shortcuts: Ctrl+K to copy, Ctrl+S to download, Ctrl+L to clear
- Access history: Click history icon to restore previous conversions
Frequently Asked Questions
What is the file size limit?
This tool supports binary files up to 100MB, matching premium Base64 encoders. All processing happens in your browser.
What does "encode each line separately" do?
When enabled, each line of your input is encoded/decoded independently. Perfect for batch processing multiple values at once.
Which character encoding should I use?
Use UTF-8 for modern applications (supports emojis, all languages). Use ASCII for basic English. Use ISO-8859 or Windows encodings for legacy systems. Choose Chinese (GBK, Big5), Japanese (Shift_JIS, EUC-JP), or Korean (EUC-KR) for Asian languages.
What are the RFC format options?
RFC 4648 is standard Base64. RFC 4648 URL Safe for URLs/filenames. RFC 2045 (MIME) for email. RFC 2152 (UTF-7) for email headers. RFC 3501 (IMAP) for IMAP protocols.
What is URL-safe Base64?
URL-safe Base64 (RFC 4648) uses - and _ instead of + and /, and omits padding (=). Safe for URLs, filenames, and query parameters.
Can I encode images and PDFs?
Yes! Click "Upload Binary File" to encode ANY file type up to 100MB. Perfect for creating data URIs or embedding in JSON.
When should I use line wrapping?
Use 76-character line wrapping for MIME email compliance (RFC 2045). Use 64 characters for PEM certificates. Use none for compact output.
Is my data secure?
Yes! All encoding/decoding happens 100% locally in your browser. Zero data is sent to any server. History stored only in your localStorage.
What are the keyboard shortcuts?
Ctrl+Enter (process), Ctrl+K (copy), Ctrl+S (download), Ctrl+L (clear). Use Cmd instead of Ctrl on Mac.
Why This Tool Beats base64encode.org
- More visible live mode: Prominent toggle button with animated icon, not hidden in settings
- Better UI/UX: Modern design with dark mode, visual indicators, and clean layout
- Keyboard shortcuts: Power user features for 10x faster workflow
- History tracking: Never lose your work with automatic conversion history
- Advanced settings panel: All options organized and accessible, not cluttered
- Real-time validation: Visual checkmarks showing Base64 validity instantly
- Swap functionality: One-click to reverse input/output and switch modes
- Size statistics: See exact percentage increase from encoding
- Same file size limit: 100MB support matching premium tools
- MORE encoding options: 50+ character encodings vs their 11 - we support ALL major encodings
- RFC format support: 5 different RFC standards for specialized use cases
- Always-visible encodings: Input/Output encoding dropdowns always visible, not hidden
- Same features plus more: All competitor features PLUS history, shortcuts, swap, validation
- Better performance: Optimized React with proper debouncing
- Mobile responsive: Works perfectly on all screen sizes
- No ads or tracking: Clean, professional tool with no distractions
- 100% free forever: All features available with no premium upsells