Base64 Encoder & Decoder
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Text to Encode
Why Choose Filator's Base64 Encoder?
Lightning Fast
Instant encoding and decoding in your browser. No server round-trips, no waiting for uploads.
100% Private
All processing happens locally. Your data never leaves your device - perfect for sensitive content.
Full UTF-8 Support
Encode any Unicode character - emojis, Chinese, Japanese, Arabic, and all special symbols.
How to Encode and Decode Base64 Online
Filator's free Base64 encoder and decoder lets you convert text to Base64 or decode Base64 strings instantly in your browser - no uploads, no server processing, no signup required. Unlike base64encode.org (server uploads with 15-minute deletion) and other tools that send your data to remote servers, Filator processes everything locally on your device for complete privacy.
Why Choose Filator's Base64 Tool?
🔒 Complete Privacy
Your text never leaves your browser. All encoding and decoding happens client-side using JavaScript. Unlike competitors that upload files to servers (then delete after 15 minutes), Filator has zero server involvement.
⚡ Instant Processing
No upload wait times, no server queues. Results appear instantly as you process. Perfect for quick encoding tasks during development or debugging sessions.
🌐 Works Offline
Install Filator as a PWA and use the Base64 encoder without internet connection. Ideal for developers working in restricted environments or encoding sensitive data.
📝 URL-Safe Encoding
Enable URL-safe mode to generate Base64 strings that can be used directly in URLs without additional encoding. Replaces +/= with -_ characters per RFC 4648.
How to Encode Text to Base64
- 1.Select "Encode" mode (default) in the tool above
- 2.Paste or type your text in the input area (supports up to 10MB)
- 3.Optionally enable "URL-safe encoding" if the result will be used in URLs
- 4.Click "Encode to Base64" to convert your text instantly
- 5.Copy the result to clipboard or download as a text file
How to Decode Base64 to Text
- 1.Switch to "Decode" mode using the toggle
- 2.Paste your Base64 string (standard or URL-safe format supported)
- 3.Click "Decode Base64" - the tool automatically handles padding and format detection
- 4.View your decoded text and copy or download the result
Base64 Encoding Explained
| Aspect | Standard Base64 | URL-Safe Base64 |
|---|---|---|
| Character Set | A-Z, a-z, 0-9, +, / | A-Z, a-z, 0-9, -, _ |
| Padding | = (required) | Omitted |
| Use Case | Email (MIME), general encoding | URLs, filenames, tokens |
| RFC Standard | RFC 4648 | RFC 4648 (Base64URL) |
| Example Output | SGVsbG8gV29ybGQh | SGVsbG8gV29ybGQh |
Advanced Features
- • UTF-8 Support: Properly encodes Unicode characters including emojis, Chinese, Japanese, Arabic, and all special symbols
- • URL-Safe Mode: Generates Base64 strings safe for URLs and filenames using RFC 4648 Base64URL variant
- • Auto-Detect Format: Decoder automatically handles standard Base64, URL-safe variants, and data URIs
- • Padding Handling: Automatically adds missing padding when decoding incomplete Base64 strings
- • Large Input Support: Process text up to 10MB with no artificial limits
- • One-Click Copy: Instantly copy encoded/decoded results to clipboard
- • Download Output: Save results as text files for later use
- • PWA Support: Install as a Progressive Web App for offline access
Common Use Cases
🔐 API Authentication
Encode credentials for HTTP Basic Authentication headers or encode API keys for safe transmission
📧 Email Attachments
MIME encoding for email content and attachments that need to be transmitted as text-safe data
🌐 Data URIs
Embed small files directly in HTML, CSS, or JavaScript using Base64-encoded data URIs
🔑 JWT Tokens
Decode JWT token payloads to inspect claims, or encode data for custom token implementations
Frequently Asked Questions
What is Base64 encoding and why do I need it?
Base64 encoding converts binary data or text into an ASCII string format using 64 characters (A-Z, a-z, 0-9, +, /). It's essential for safely transmitting data over systems designed for text, like email (MIME), embedding data in URLs, storing complex data in JSON/XML, and including binary data in web pages.
How do I encode text to Base64 online?
Simply paste your text into Filator's Base64 Encoder, select Encode mode, and click the encode button. Your text is instantly converted to Base64. Copy the result with one click or download it as a file. The conversion happens entirely in your browser with no data sent to any server.
What is URL-safe Base64 encoding?
URL-safe Base64 (RFC 4648) replaces the + and / characters with - and _ respectively, and removes padding = signs. This variant is safe to use directly in URLs without additional encoding. Enable the URL-safe option when encoding text for web addresses or filenames.
Is Filator's Base64 encoder safe for sensitive data?
Yes, completely safe. Filator processes everything 100% client-side in your browser using JavaScript. Your text never leaves your device - there's no server upload, no data storage, and no tracking. This makes it ideal for encoding API keys, tokens, or any sensitive information.
Does Base64 encryption secure my data?
No, Base64 is encoding, not encryption. It converts data to a different format but provides no security - anyone can decode Base64 strings. For security, use actual encryption (AES, RSA) before Base64 encoding if needed.
Does the encoder support special characters and emojis?
Yes, Filator fully supports UTF-8 encoding, which means you can encode any Unicode characters including emojis, Chinese, Japanese, Arabic, Cyrillic, and all special symbols. The tool properly handles multi-byte characters.
What's the maximum text size I can encode?
Filator supports text inputs up to 10MB. Since processing happens in your browser, there are no server upload limits. Larger files may take a moment to process depending on your device's performance.
Can I use this Base64 tool offline?
Yes! Filator works offline after the initial page load. Install it as a PWA (Progressive Web App) from your browser for full offline access. Perfect for developers working in restricted environments or encoding sensitive data without network connectivity.
Ready to Encode or Decode Base64?
Start converting text to Base64 instantly with complete privacy. No signup, no file uploads, no server processing - just fast, secure encoding and decoding that works entirely in your browser. Try Filator's Base64 tool now.