ASCII to Base64 Converter
Convert ASCII text to Base64 instantly (e.g., 'Hello' = SGVsbG8=). Free online ASCII to Base64 converter for developers.
100% Client-Side Processing
Your data is converted entirely in your browser. No data is sent to any server.
Table of Contents
What is ASCII ↔ Base64 conversion?
Base64 encodes bytes into a text-safe alphabet (A–Z, a–z, 0–9, +, /) so binary data can be embedded in text formats.
This tool Base64-encodes/decodes UTF-8 text entirely in your browser.
How it Works
- Paste text or Base64.
- Convert instantly.
- Copy output.
Decoding accepts URL-safe Base64 (- and _) and ignores whitespace.
Common Use Cases
When to use ASCII to Base64
- Embedding small text in URLs, JSON, or config files
- Generating Basic Auth headers (username:password)
- Creating compact tokens for transport (not encryption)
- Sending text through systems that require ASCII-only characters
When to use Base64 to ASCII
- Decoding Base64 payloads from APIs/logs
- Inspecting JWT segments or encoded metadata
- Recovering readable text from encoded values
Examples
Basic conversion
- Input:
Hello - Output:
SGVsbG8=
Special characters (UTF-8)
- Input:
Hello! 👋 - Output:
SGVsbG8hIPCfkYs=
Want to look up a character code first? Check the ASCII Table for a complete reference.
Conversion Tips
Padding
Base64 commonly ends with "=" padding. Some systems omit padding; decoding typically still works.
URL-safe Base64
URL-safe Base64 replaces + with - and / with _. This tool accepts both forms when decoding.
Frequently Asked Questions
No. Base64 is an encoding. Anyone can decode it. Use encryption if you need secrecy.
If the Base64 content represents non-text (like an image) or uses a different character encoding, decoding as UTF-8 text may not be meaningful.
Quick Reference
- Standard alphabet: A–Z, a–z, 0–9, +, /
- URL-safe alphabet: A–Z, a–z, 0–9, -, _
- Padding character: =