How it works
How to use the Base64 Decode
Paste or open your input
Type, paste or drop a file into the left editor — or press Sample to try it.
Adjust the options
Use the options in the toolbar; the result updates as you type.
Copy or download the result
Copy the output or download it as a file.
About the Base64 Decode
Decode Base64 or Base64URL back to text, or download the decoded bytes as a file — images are previewed automatically.
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
Is my data uploaded anywhere?
No. Everything runs locally in your browser — nothing you type, paste or open is sent to a server, logged or stored. The tool keeps working offline once the page has loaded.
Keep going
Related tools
- Base64 Encode / DecodeEncode and decode Base64 text and files
- URL Encode / DecodePercent-encode and decode URLs and query strings
- URL DecodeDecode percent-encoded text
- JSON URL DecodeDecode percent-encoded JSON
- XML URL DecodeDecode percent-encoded XML
- YAML URL DecodeDecode percent-encoded YAML
- Image to Base64 ConverterConvert images to Base64 data URIs
- PNG to Base64 ConverterConvert PNG images to Base64