Base64 Encoder / Decoder for Windows
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.
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.
Screenshots
Main Application Interface
Text Encoding & Decoding
File & Folder Batch Processing
Latest Release
Version 1.0 — January 2026
Initial release — text & file encoding/decoding, batch folder processing, chunked streaming.