Base64 Encoder & Decoder — Text & Files — Made Easy Tools
Plain Text Input
Base64 Output
Base64 Encoding & Decoding Made Easy
Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with textual data. Our utility provides a 100% private, client-side solution for both text messages and binary files (like PNG, JPEG, PDF, and SVG).
🔒 Complete Client-Side Privacy
Your inputs, files, and generated Base64 strings are processed locally inside your web browser. Nothing is uploaded to any servers, ensuring absolute privacy for keys, credentials, or sensitive documents.
📁 File to Base64 & Data URIs
Convert images, PDFs, documents, or font files into raw Base64 strings or standard Data URI formats. Ready to copy and paste directly into HTML elements or CSS stylesheets.
🔄 Base64 to Binary File Download
Paste a raw Base64 string or Data URI, and the tool will automatically detect the MIME type, compile it back to binary format, and let you download the exact file locally.
⚡ Live Conversion & Size Estimator
Encoder updates values instantly as you type. It also tracks input and output sizes, indicating any potential size expansion associated with Base64 encoding.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is widely used to embed images directly in HTML/CSS or to send files through text-based APIs.
Does encoding increase the file size?
Yes, Base64 encoding increases the file size by approximately 33%. For large assets, we recommend referencing them as external resources unless inlining is required for speed or standalone HTML files.
Can I decode standard Data URIs?
Absolutely! Our decoder handles both raw Base64 strings (e.g., `SGVsbG8=`) and full Data URI headers (e.g., `data:text/plain;base64,SGVsbG8=`). It will automatically parse the headers and isolate the data.
Is there a file size limit?
To prevent browser memory crashes, we limit the local file upload size to 10MB. Since all processing runs on the client CPU, larger files may cause temporary UI freezes.