Base64 Encode and Decode Online — Fast, Free, No Install

You're reading an API response, a JWT token, or an email header and you see a long string of letters and numbers ending in ==. That's Base64. And at some point as a developer, you need to either create one or read one.

The Base64 Encoder and Base64 Decoder on this site handle both directions instantly — no install, runs entirely in your browser.

What Is Base64 Actually?

Base64 is an encoding scheme that converts binary data into plain ASCII text. It uses 64 characters — A–Z, a–z, 0–9, plus + and / — to represent any data as a readable string.

It was designed to safely transmit binary data (images, files, credentials) through systems that only handle text — like email protocols, HTTP headers, and JSON APIs.

Important: Base64 is encoding, not encryption. It's not secure on its own. Anyone can decode a Base64 string in seconds. Don't use it to hide sensitive information.

Where You'll Actually See Base64

Once you know what Base64 looks like, you start seeing it everywhere:

• JWT tokens — the middle section of a JSON Web Token is Base64-encoded JSON
• HTTP Basic Auth — credentials are sent as Basic <base64(username:password)>
• Data URIs — embedding images directly in HTML or CSS as data:image/png;base64,...
• Email attachments — MIME encoding uses Base64 for attachments
• API keys and secrets — many services encode their keys in Base64
• Environment variables — complex config values are sometimes Base64-encoded for safe storage

How to Encode Text to Base64

1. Go to rohansurve.in/free-tools/base64-encode
2. Paste your plain text into the input
3. The Base64 output appears instantly
4. Copy and use it wherever you need

Example — encoding rohan:mypassword gives you cm9oYW46bXlwYXNzd29yZA==

How to Decode Base64 Back to Text

1. Go to rohansurve.in/free-tools/base64-decode
2. Paste your Base64 string
3. The decoded plain text appears immediately

Useful when you're debugging an API, reading a JWT payload, or checking what's inside a Basic Auth header.

Decoding a JWT Token Manually

JWT tokens have three Base64-encoded sections separated by dots. The middle section is the payload — it contains the claims (user ID, expiry, roles, etc.).

To read it — take everything between the first and second dot, paste it into the decoder, and you'll see the JSON payload in plain text. This is useful for debugging auth issues without needing a dedicated JWT tool.

Note: the third section (signature) is a cryptographic hash — decoding it won't give you readable text.

Base64 vs Other Encoding Tools

Base64 is one of several encoding formats developers work with regularly. Here are related tools on this site:

• URL Encoder — encode special characters for safe URL usage
• URL Decoder — decode percent-encoded URL strings
• HTML Encoder — convert special characters to HTML entities
• HTML Decoder — convert HTML entities back to readable characters
• MD5 Generator — generate MD5 hashes for checksums

All part of the free developer tools collection — open and use without any account.

Runs in Your Browser, Nothing Sent to a Server

This matters for Base64 specifically because developers sometimes encode credentials, tokens, or config values. The encoder and decoder on this site run entirely client-side in JavaScript. Your input never leaves your machine. You can switch off your internet connection and they still work.

Bookmark both — encoder and decoder — and you'll reach for them more often than you expect.