Base64 Decoder
Decode Base64 strings and data URLs back to text or files — with automatic image preview. 100% private.
Base64 Input
Decoded Output
Result appears here…By Vizo ToolLast updated August 20264 min read
Base64 Decoder — Decode Text, Files & Images Instantly
The Base64 Decoder converts Base64 strings back into readable text or binary files right in your browser. Paste any Base64 string or data URL and get the original content instantly — perfect for inspecting API payloads, JWT segments, and embedded images.
It detects image data URLs automatically and renders a live preview so you can verify exactly what you're decoding. UTF-8 text like emoji and non-Latin scripts decodes correctly, and everything runs locally for complete privacy.
- Decode text & data URLs
- UTF-8 safe
- Image preview
- Copy & download
Why Use Base64 Decoder?
Text & Binary Decoding
Decode Base64 strings back to readable text or binary files.
Automatic Image Preview
Image data URLs render as a live preview — no guessing.
UTF-8 Correct
Emoji and non-Latin text decode correctly, unlike naive atob() tools.
100% Private
Decoding happens in your browser; nothing is uploaded.
Features
Text Decoding
Decode any Base64 string back to its original UTF-8 text.
Data URL Support
Paste a full data:...;base64,... URL and it's decoded automatically.
Image Preview
Decoded images appear in a live preview panel.
File Download
Save decoded binary data back to a file with one click.
Error Feedback
Invalid Base64 input is flagged with a clear message.
How to Decode Base64
Decode any Base64 string in three steps.
Paste your Base64
Paste a Base64 string or data URL into the input box.
Watch it decode
The decoded text, file, or image preview appears instantly.
Copy or download
Copy the decoded text or download the original file.
Frequently Asked Questions
Got questions? We've got answers.
What is a Base64 decoder?▼
It converts Base64-encoded text back into its original content — readable text, binary files, or images.
Is the Base64 decoder free?▼
Yes, completely free with no sign-ups or limits.
Are my strings uploaded?▼
No, decoding runs entirely in your browser.
Can it decode a data URL?▼
Yes — paste a full data:image/png;base64,... URL and the tool extracts and decodes the payload automatically.
Will images show a preview?▼
Yes, image data URLs render in a preview panel so you can verify the result before downloading.
Does it handle emoji correctly?▼
Yes, decoded UTF-8 text (emoji and non-Latin scripts) is handled correctly.
What if my Base64 is invalid?▼
The tool shows a clear error message so you can fix the input.
Can I decode to a file?▼
Yes — if the decoded content is binary, you can download it as a file.
What's a JWT? Can I decode one here?▼
JWTs use URL-safe Base64 for their three segments. For a full breakdown with expiry, use our dedicated JWT Decoder tool.
Does it work on mobile?▼
Yes, the tool is fully responsive.
Why does my decoded text show garbled characters?▼
That usually means the input isn't valid Base64 or was encoded from binary, not text. Try the file download to recover binary content.
Is Base64 decodable by anyone?▼
Yes — Base64 is an encoding, not encryption. Never put secrets in Base64 expecting privacy.
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