Developer Guides · · 5 min read
What Is Base64 Encoding? How It Works, With Examples
Base64 explained simply: how it turns bytes into text, a step-by-step example, why output grows by a third, padding, URL-safe Base64 and when not to use it.
💻 Developer Guides guides
Short, accurate explanations of the formats web developers meet every day, with links to the official specifications.
Formats every web developer meets
Modern web work is full of small data formats: JSON for APIs and config files, Base64 for putting binary data inside text, UUIDs for unique IDs, and HEX or RGB codes for colours. Each one has a precise specification, but you rarely need to read it end to end. You need to know what the format is for, how to recognise it, the common mistakes, and a quick way to check your data. That is what these guides give you.
Our approach
- We link to the primary specification (usually an IETF RFC or the MDN reference) so you can go deeper.
- We show small, copyable examples rather than long theory.
- Every guide links to a browser-based tool that formats, encodes or converts your data locally, without uploading it.
Security reminders
Encoding is not encryption. Base64 and URL encoding only change how data is written, and anyone can reverse them. Hashes are one-way but not all hashes are suitable for passwords. Never paste production secrets, private keys or customer data into online tools you do not trust, and prefer tools, like ours, that run entirely on your device.