Mode
Operation
Encode text, Decode Base64
Base64 Encoder & Decoder
Encode UTF8 text, decode strict Base64 and inspect binary results as hex.
Open this toolBase64 represents bytes as text. It does not make a message confidential.
Choose encoding or decoding and inspect whether the decoded bytes form readable UTF8.
Inputs and controls
Alphabet
Operation
Standard Base64, Base64url
Text or encoded data
Source
How to use
- Choose mode and alphabet.
- Paste or enter text or encoded data.
- Select Process input. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.
Why use this tool
Binary results are shown as hexadecimal rather than being executed or displayed as markup.
Before relying on the result
Decoded invalid UTF8 or control bytes are shown as hexadecimal. Binary bytes are not rendered as HTML. Canonical padding is checked.
Tool limitations
Decoded invalid UTF8 or control bytes are shown as hexadecimal. Binary bytes are not rendered as HTML. Canonical padding is checked.
Questions
Why can a decoded result appear as hex?
Invalid UTF8 or control bytes are not safely readable text. Hex preserves a view of those bytes.
What should I check before using Base64 Encoder & Decoder?
Check Mode, Alphabet and Text or encoded data. Use the exact units shown beside the controls and replace any example values with your own inputs.
Source page last modified: 2026-10-04T16:58:29+00:00. This profile describes the tool; use its page to run it.
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