Base64 Decode

Decode Base64 encoded text and data back to its original format for viewing and processing.

Overview

Base64 Decode converts Base64-encoded strings back to their original plain text, binary data, or file content — entirely inside your browser. Paste any Base64 string and the decoded result appears immediately, with no server involved and no data transmitted anywhere. This matters especially for encoded content that may be sensitive: API tokens, JWT payloads, email attachment data, or embedded file blobs are decoded locally and stay on your device. Whether you are reversing a Base64-encoded image, inspecting an encoded configuration value, or extracting binary data from a data URI, the decoding process is instant and private.

Common Use Cases

  • Inspect JWT or API Tokens — Developers decode the Base64url payload of a JWT or API response to read the underlying JSON claims without any external tool.
  • Decode Email Attachments — Email protocols encode attachments as Base64; paste the encoded block here to recover the original binary file for download.
  • Read Embedded Data URIs — Web developers extract raw image or font data from Base64 data URIs to verify contents or convert them to standalone files.
  • Debug Encoded Config Values — DevOps engineers decode Base64-encoded Kubernetes secrets or CI environment variables to confirm their plain-text contents locally.
  • Extract Binary from API Responses — Reverse Base64 strings returned by REST or GraphQL APIs that encode binary payloads, then download the result as a file.

How It Works
1

Input Base64 Data

Paste the Base64 encoded text that you want to decode back to its original format.

2

Automatic Decoding

The tool instantly converts the Base64 data back to its original format using secure browser processing.

3

View or Download

View the decoded text result or download binary files that were encoded.

Frequently Asked Questions

How do I know if text is Base64 encoded?
Base64 encoded text typically contains only letters (A-Z, a-z), numbers (0-9), plus (+), slash (/), and equals (=) for padding. It often looks like random characters and may end with one or two equals signs.

Is the decoding process secure?
Yes, all decoding happens locally in your browser. Your Base64 data is processed entirely on your device and never sent to external servers.

What happens if the Base64 is invalid?
The tool will display an error message if the input is not valid Base64. Make sure the text is properly formatted and contains only valid Base64 characters.

Can I decode Base64 files?
Yes, you can decode Base64 text that represents files. The tool will allow you to download the decoded binary data as a file.

Gerelateerde Tools

AES Bestand & Tekst Encryptor Base64 Encode CSR Generator DER naar PEM Converter Hash Generator JWT Sign