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Paste code or technical input, upload a supported plain text file, or load the working example. Check headers, delimiters, syntax, or line structure before processing.
Developer tools
Base64 Encoder and Decoder
Result
The result will appear here after you run the tool.
Press Ctrl or Command and Enter to run the tool.
About this tool
About this tool
Base64 Encoder Decoder transforms text to Base64 and decodes Base64 back to text by using browser encoding routines. Input and output stay in the browser workspace for review and download.
Encode text as Base64 or decode Base64 back to text. Use the full-width workspace to decode content while reviewing syntax, encodings, protocol fields, and implementation details. The tool accepts plain text, provides focused options, and creates plain text output that you can inspect, copy, download, or save as a local draft.
Built for daily work
How to use this tool
How to use this tool
Configure the operation
Review Mode. The selected controls determine how the Base64 Encoder and Decoder interprets the source and builds the result.
Run the tool
Start the Base64 Encoder and Decoder and review the result, visual preview, and technical report. Correct any reported issue and run the tool again when necessary.
Export or continue the workflow
Copy or download the plain text result, save a browser-local draft, or open a related tool for the next conversion, validation, or cleanup step.
Key features
Key features
Encode text or binary to Base64 and back
Switch between encode and decode mode to convert plain text into Base64 strings or reverse Base64-encoded content to readable text.
Handles Unicode without mojibake
The encoder uses UTF-8 byte sequences so multibyte characters survive a round trip through Base64 and back.
Copy and download in either direction
Copy the Base64 string or the decoded text to the clipboard, or download as a file.
No file type detection or multipart decoding
The tool works on the text you paste. It does not detect MIME types, decode Base64 images, or split multipart payloads.
Practical use cases
Practical use cases
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
Input formatsplain text
Output formatsplain text
ProcessingLocal browser processing
Task controlsMode
Maximum local file25 MB per supported file
Workspace featuresFocus mode, examples, copy, download, local drafts, and result reports
Limitations and important notes
Limitations and important notes
- Decoding is not the same as verifying authenticity or trustworthiness.
- Large or deeply structured input depends on available browser memory and may process more slowly on mobile devices.
- The tool implements practical browser-based processing and may not reproduce every feature of specialist desktop software or every vendor-specific extension.
- Keep the original source and review generated output before production, security-sensitive, financial, legal, or safety-critical use.
Frequently asked questions
Frequently asked questions
It transforms text to Base64 and decodes Base64 back to text by using browser encoding routines, with input remaining in the workspace.
The tool uses standard Base64; URL-safe variant handling depends on the options provided in the workspace.
The browser can handle up to 25 MB per file locally, although very large payloads may be slower to encode or decode.
No. Operations are local in your browser.
Related guides and solutions
Related guides and solutions
How to encode and decode Base64, and why it is not encryption
A guide to Base64: what the encoding does, when to use it, how to encode and decode locally, and why it adds no security.
Learn moreEncode or decode Base64 text and files
Base64 turns binary data into safe ASCII text for APIs, data URIs, and email. The [Base64 encoder and decoder](tool:base64-encoder-decoder) handles both directions locally, including file uploads, so nothing leaves your browser.
Learn moreA safe workflow for cleaning text and line-based data
A step-by-step text cleanup process that uses small reversible changes, diff review, and Unicode awareness instead of destructive one-click normalization.
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