Base64 Encode & Decode

Base64 Encoder & Decoder User Guide

This all-in-one Base64 tool supports conversion between standard Base64, Base64URL and DataURL. It handles text, images, documents and binary files. No software installation or server deployment required. All conversion runs directly inside your browser, with simple operation, fast processing and secure local computing.

Core Features

1. Multi-format conversion support Convert between standard Base64, Base64URL and DataURL. Suitable for web development, API debugging, data encryption and file storage scenarios.

2. Fast text encoding and decoding Encode and decode any text, numbers, symbols and URLs with one click. Output preview appears instantly.

3. File and image conversion Upload local images, documents and archives. Convert files into Base64 strings or restore original files from Base64 data for download. Maximum supported file size: 50MB.

4. Drag and drop upload Upload files via click or drag-and-drop to simplify workflow.

5. Secure local processing All encoding and decoding operations run locally in your browser. Data will never be uploaded to remote servers to protect privacy and prevent leakage.

Instructions

1. Base64 Encoding

1. Enter text or URLs on the left encoding panel, or drag and drop local files and images.
2. Select encoding mode: Standard Base64 or Base64URL.
3. Enable DataURL checkbox if you need DataURL output.
4. Click encode to generate Base64 results.
5. Copy output to clipboard using copy button.

2. Base64 Decoding

1. Paste Base64, Base64URL or DataURL strings into the right decoding panel.
2. Click decode. The tool automatically detects format and parses data.
3. If decoded content is text, original text will display and can be copied directly.
4. If decoded content is binary data such as images or documents, preview content will be centered. You can view file information and download the restored file.

Application Scenarios

1. Frontend development: Embed images and static assets as Base64 to optimize page loading speed.
2. API debugging: Encode and decode request parameters for API transmission standards.
3. Data storage: Store short text and small files as Base64 inside databases and configuration files.
4. Office work: Simple text conversion and lightweight data encryption for daily use.

Frequently Asked Questions

1. Why does decoding fail?

Invalid string format, non-standard Base64, missing or modified characters will cause decoding errors. Please check your input integrity.

2. Why use Base64URL?

Standard Base64 contains special characters +, / and = which break URLs. Base64URL replaces these characters and works safely for web addresses and API parameters.

3. What is the maximum supported file size?

The tool supports files up to 50MB, covering most development and office requirements.

4. Is converted data safe?

All conversions run locally in your browser. Data is never uploaded or stored, ensuring full data security.