Base64 Encoder / Decoder
Base64 Encode & Decode – Online Converter
About Base64 Encoder / Decoder
A Base64 Encoder/Decoder translates standard text or binary files into Base64 representation (and vice versa). It lets you safely serialize assets or keys for URL compatibility and payload transport.
How It Works
Using the browser's native window.btoa and window.atob buffers offloaded for large byte arrays, it executes safe transformations locally without network transmissions.
How to Use Base64 Encoder / Decoder
- Select either the Encode or Decode mode on the conversion panel.
- Paste your source text payload, or drag and drop a binary file into the drop zone.
- Check the resulting string output displayed in the result editor.
- Click Copy or Download to save your Base64 encoded or decoded text output.
FAQ
Does this support binary files?
Yes. Drop a file into the input pane and the tool encodes the raw bytes without corrupting them through a text round-trip.
What's the URL-safe variant?
Standard Base64 uses `+` and `/`, which are reserved in URLs. The URL-safe variant substitutes `-` and `_` and omits padding.
Under the hood
Uses `TextEncoder`/`TextDecoder` plus `btoa`/`atob` for ASCII fast paths, and a chunked Uint8Array codec for binary input that avoids the call-stack overflow common in naive implementations.
Engineered by HaorGrix