Base64 Encoder
Encode and decode Base64 strings instantly.
What is this tool?
The Base64 Encoder and Decoder converts text strings and binary files to and from Base64 representation. It supports Standard Base64, URL-Safe Base64, Hexadecimal (Base16), and Base58 encodings. Features include Unicode-safe text conversion, client-side canvas image compression, media previewing (images, video, audio, PDFs), and a multi-file batch queue with JSON export.
How to encode and decode Base64
- Select your desired mode: Text, File, or Batch Queue.
- For text: type or paste your content, select an alphabet (Standard Base64, URL-Safe, Hex, Base58), and click Encode or Decode.
- For files: drag and drop an image or document to convert it into a Base64 data URI with optional canvas image resizing.
- Copy the output or download the result as a text or JSON file.
Key Features
- Standard Base64, URL-Safe Base64, Hexadecimal, and Base58 alphabet options
- Unicode-safe encoding and decoding using TextEncoder and TextDecoder
- Client-side image compression with quality and max-width controls
- In-browser media preview for images, video, audio, and PDF documents
- Multi-file batch queue with bulk JSON mapping export
- Code snippet generator for cURL, Python, Node.js, and Go
Frequently Asked Questions
What is Base64 encoding used for?
Base64 encodes binary data into 64 printable ASCII characters. It is commonly used to embed images directly into HTML or CSS as data URIs, send file attachments in email (MIME), and transfer binary objects inside JSON payloads.
What is the difference between Standard Base64 and URL-Safe Base64?
Standard Base64 uses '+' and '/' characters, which have special meanings in URL query strings. URL-safe Base64 substitutes '-' and '_' in their place and removes trailing '=' padding to prevent URL parsing errors.
Does Base64 encoding encrypt my information?
No. Base64 is an encoding format designed for data transport, not encryption. Anyone can decode a Base64 string back to its original plaintext or binary data without a secret key.
Why does Base64 increase file size?
Base64 maps every 3 bytes (24 bits) of raw data into 4 ASCII characters (32 bits), introducing an overhead of approximately 33% relative to the original binary file.
Are my files uploaded to an external server?
No. File reading, image compression, and encoding run completely in your local browser using the native FileReader API and HTML5 Canvas. Your files never leave your device.
Privacy First
Processed 100% locally in your browser using native Web APIs. Files and strings are never uploaded.