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Base64 Encoder/Decoder

A free, lightweight Base64 Encoder/Decoder for Windows — built for developers, IT professionals, and anyone working with data encoding. Encode and decode text or files entirely offline, with no data ever leaving your machine.

Download Desktop Version 1.0

Free on the Microsoft Store — no subscription, no ads.

Get it from Microsoft

Features

📝 Text Encoding & Decoding

Paste any text and instantly encode it to Base64 or decode Base64 back to readable content — all within a clean, simple interface.

📁 Single File Encoding & Decoding

Select any file on your system and encode or decode it to a new output file. Real-time progress bar keeps you informed on large files.

📂 Batch Folder Processing

Process entire folders at once. Filter by file extension, add a custom extension to output files (e.g. .base64), or automatically strip the last extension when decoding.

⚠️ Smart Overwrite Handling

When output files already exist, a prompt lets you choose to Overwrite, Skip, or Cancel — with an Apply to All option to handle remaining files automatically.

⚡ Chunked Streaming for Large Files

Files are processed in ~1MB chunks rather than loaded entirely into memory, making it reliable and efficient even for very large files.

🔒 Fully Offline & Private

No internet connection required. Your files and data never leave your computer — everything is processed locally on your machine.

System Requirements: Windows 7 / 8 / 10 / 11  (32-bit or 64-bit)

Screenshots

Main Interface Thumbnail
Text Encoding Thumbnail
File & Folder Processing Thumbnail