Free Online Base64 Encoder & Decoder
Our free Online Base64 Encoder & Decoder lets you convert text, images, files, and binary data into Base64 format instantly. Whether you are a developer, designer, security expert, or everyday user, this tool provides a fast, accurate, and privacy-friendly way to encode or decode Base64 online.
Everything happens locally in your browser with zero data uploaded, making it safe for sensitive information.
What Is Base64 Encoding?
Base64 is a binary-to-text encoding method that represents binary data using 64 ASCII characters. It is commonly used for:
- Embedding images in HTML, CSS, or JSON
- Email MIME encoding
- Storing and transferring binary files safely
- Encoding data for URL and API communication
- Converting files to readable text format
Because Base64 is widely used across web development, cryptography, and data transmission, having a powerful online Base64 encoder/decoder is essential.
Features of Our Base64 Encoder & Decoder Tool
Enjoy a full set of advanced developer features designed for real-world work:
- Text → Base64 (UTF-8 supported)
- Base64 → Text decoding
- Encode any file: images, PDFs, documents, audio, video
- Decode Base64 to file and download instantly
- Base64URL conversion for JWT, OAuth, and API tokens
- Remove padding (=) from Base64
- Enable MIME line wrapping every 76 characters
- Clean whitespace, newlines, and invalid characters
- Hex viewer and ASCII preview of decoded data
- Image preview for Base64-encoded PNG, JPG, SVG, GIF
- Drag & Drop file upload
- Copy, clear, one-click beautify options
- All processing is done offline in your browser
Why Use This Base64 Tool?
#✔ 100% Accurate & Standards-Compliant
Follows RFC 4648 & MIME Base64 encoding standards.
#✔ Client-Side & Privacy-Friendly
No data ever leaves your device-perfect for confidential files.
#✔ Works With Large Files
Efficient encoding and decoding even for big text or image files.
#✔ Supports Developers & Non-Developers
Clean UI anyone can use, with advanced options for professionals.
How to Encode Text to Base64
- Type or paste your text into the input box.
- Click Encode.
- Your Base64 output will appear instantly.
- Copy or download the encoded data.
How to Decode Base64 to Text
- Paste your Base64 string into the decoder area.
- Click Decode.
- You’ll immediately see the original text or file.
- If it is a file, you can download the decoded file.
Common Use Cases
- Embedding images as Base64 in HTML/CSS
- Sending binary data through JSON
- Decoding Base64 strings from APIs
- Encoding files for safe transport
- Debugging Base64 strings in JWT tokens
- Preparing email MIME attachments
Frequently Asked Questions
#Is Base64 encoding secure?
No. Base64 is an encoding method, not encryption. It should not be used for secure data protection.
#Is this Base64 tool safe for sensitive files?
Yes. All encoding/decoding is done in your browser. No files or text are uploaded to servers.
#Can I decode images and convert them back into files?
Yes. If your Base64 string contains valid binary data, you can download the original file instantly.
#What is Base64URL used for?
Base64URL is a URL-safe variant of Base64 used in JWTs, OAuth, OpenID, APIs and cryptographic applications.
#Does Base64 increase file size?
Yes. Base64 encoding increases data size by approximately 33%.
Start Encoding & Decoding Now
Use the most advanced Base64 Encoder & Decoder online-fast, secure, and built for developers. Encode or decode text, images, PDFs, or any file with complete control and zero data tracking.