Base64 Decoder
Decode Base64 strings and data URLs back to text.
Runs entirely in your browser - your files are never uploaded
What is Base64 Decoder?
Base64 Decoder is a free, web-based utility designed for instant, local developer tools tasks. It allows users to compute, format, convert, or edit data directly in their browser without installing software or registering an account.
- 100% Free & Unlimited Usage
- 0% File Uploads (100% Client-Side Privacy)
- Instant Real-Time Calculations
- Mobile, Tablet & Desktop Compatible
How to use Base64 Decoder
Select or Enter Input
Provide your source file or type your values into Base64 Decoder.
Configure Settings
Adjust parameters, formatting options, or units in real-time.
Get Instant Output
Download the final processed file or copy the generated output.
About the Base64 Decoder
Paste a Base64 string - with or without a data URL prefix - and read the decoded UTF-8 text. Useful for inspecting JWT payloads, config blobs and encoded webhook bodies.
URL-safe Base64 that uses - and _ instead of + and / is detected and handled automatically.
Frequently asked questions
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