Base64 Decoder

Convert Base64‑encoded strings back to plain text

Instant Decoding

Decodes as you type or paste – real‑time results

Standard Base64

Supports standard Base64 encoding (RFC 4648)

Privacy First

All processing happens locally in your browser

Copy Ready

One‑click copy of decoded text

Online Free Base64 Decoder

Convert Base64‑encoded strings back to plain text, binary data, or readable content.

Pro Tip: Use this tool to decode data you receive from APIs, data URIs, or any Base64‑encoded content.

Why Decode Base64?

API Responses

Many APIs return binary data (images, files) as Base64 strings
Decode to extract the original content

Data Inspection

Inspect encoded data stored in databases, logs, or configuration files
Debug encoded content embedded in HTML/CSS

How It Works

Base64 decoding reverses the encoding process. Our decoder uses the browser’s built‑in atob() function:

Validate Input

The tool checks if the input is a valid Base64 string (only A‑Z, a‑z, 0‑9, +, /, and = padding).

Decode to Binary

The string is converted back to its original binary form using standard Base64 decoding.

Output Plain Text

The binary data is interpreted as UTF‑8 text and displayed as readable content.

Frequently Asked Questions

Sample

QmFzZTY0IERlY29kZXI=

Converts to:

Base64 Decoder

Best Practices

Ensure your Base64 string is complete and properly padded with `=` if needed
If decoding fails, verify the input isn’t URL‑safe Base64 (replace `-` with `+`, `_` with `/`)
For large strings, the browser may have performance limits; consider splitting into smaller chunks

Common Use Cases

Decoding data URIs from HTML/CSS (e.g., `data:image/png;base64,...`)
Extracting text from encoded API responses
Reading embedded content from JSON or XML