Base64 Encoder Decoder
Encode and decode Base64 with standard or URL-safe alphabets — free browser tool on AboveTool.
About Base64 Encoding:
- Standard Base64 uses characters A–Z, a–z, 0–9, +, / and = padding (RFC 4648)
- URL-Safe Base64 replaces + with - and / with _ — safe for URLs and filenames (RFC 4648 §5)
- Base64 increases data size by approximately 33% (3 bytes → 4 characters)
- Base64 is an encoding, not encryption — it provides no security on its own
About Base64 Encoder Decoder
Base64 Encoder Decoder is a free crypto & security utility on AboveTool. It runs in your browser at abovetool.com so you can utilities tasks without installing software or creating an account.
How to use
- Select encode or decode mode and alphabet (standard or URL-safe).
- Paste text into the input area.
- Click Encode to Base64 or Decode from Base64.
Features
- Runs entirely in your browser
- No signup or installation required
- Private — your data stays on your device
- Free to use on abovetool.com
Frequently asked questions
Is Base64 Encoder Decoder free on AboveTool?
Yes. Base64 Encoder Decoder is free to use on abovetool.com with no account required.
Are my files uploaded to a server?
Most tools on AboveTool process files locally in your browser. Your content stays on your device.
Who is this Crypto & Security tool for?
Anyone who needs quick Utilities tasks without installing desktop software — students, developers, designers, and office teams.