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What is a Base64 Decoder?

Base64 packs arbitrary bytes into a 64-character alphabet so binary data can survive being stringified — in URLs, JSON, email, or JWTs. A decoder reverses that: paste the encoded string, get the original text or bytes back. EasyRead detects both the standard alphabet (+ /) and the URL-safe variant (- _) automatically.

Common use cases

Inspecting JWT payloads

The three parts of a JWT are Base64URL-encoded. Decode the middle section to see the claims — or use the JWT Decoder for a structured view.

Reading encoded API responses

Some APIs return binary data (images, protobuf, gzip) as Base64. Decode to inspect or save locally.

Extracting embedded assets

Data URIs in HTML/CSS (data:image/png;base64,…) are Base64-encoded payloads — decode to pull the raw image or font out.

FAQ

What if decoding fails?

Make sure the string has a length divisible by 4 and only contains A–Z, a–z, 0–9, +/= (or -/_ for URL-safe). Extra whitespace is fine; mixed alphabets are not.

What's the difference between standard and URL-safe Base64?

Standard uses +, /, =. URL-safe replaces + with - and / with _, and sometimes omits = padding. URL-safe is what JWTs use. EasyRead handles both.

Can I decode binary data (images, files)?

Yes. If the decoded bytes look like garbled text, it's because they're binary. Use a tool like Image to Base64 in reverse for images.

Is it safe to paste tokens here?

Yes — all decoding happens inside your browser. No data leaves the page.