Full UTF-8 & Unicode Support for International Characters
Client-Side File to Base64 Conversion
Features explained
Bi-Directional Processing
Easily switch between Base64 Encoding and Decoding with live real-time output rendering.
File & Image Decoder
Decode Base64 strings representing binary files back into downloadable original file formats.
URL-Safe Formatting
Convert Base64 outputs into URL-safe strings for query parameters and URI routing.
100% Client-Side Privacy
All string encoding and file conversions are executed locally in your browser memory without server uploads.
What can you use it for?
Web Development & Inline Assets
Embed small icons, images, or custom fonts directly into CSS or HTML files to reduce server HTTP requests.
API Payload Authentication
Encode API keys, authorization tokens, or HTTP Basic Auth headers safely for RESTful requests.
Email & MIME Data Transmission
Format binary file attachments into ASCII Base64 strings for standard email transfer protocols.
Tool information
| Supported Encoding | Base64, URL-Safe Base64, Data URI Scheme |
|---|---|
| Character Set | UTF-8, ASCII, Full Unicode & Emoji Support |
| Max File Size | Up to 20MB in-browser file handling |
| Processing Engine | 100% Client-Side Web API |
Benefits
- Completely free with no file limits or user sign-ups.
- Prevents binary corruption across text-based network APIs.
- Instant live conversion with single-click clipboard copying.
Limitations
- Base64 encoding increases file size by approximately 33% compared to raw binary data.
Client-Side Security Guarantee
Your text data, sensitive API tokens, and uploaded files are processed entirely in browser memory. No data is stored, logged, or uploaded to external servers.
Privacy Assurance
We prioritize user privacy. Text and file inputs remain strictly local to your device.
Tips
- Use URL-safe Base64 when sending encoded strings as URL parameters to prevent HTTP parsing errors.
- To embed images directly in HTML, select the Data URI checkbox for instant `data:image/png;base64` snippets.
Frequently asked questions
Is Base64 encoding a form of encryption?
No. Base64 is an encoding format used to represent binary data in ASCII text. It offers no security or data encryption and can be easily decoded by anyone.
Why does Base64 increase file size?
Base64 represents 3 bytes of binary data using 4 printable ASCII characters (6 bits per character), resulting in a roughly 33% size increase.
Does this tool support non-English characters and emojis?
Yes. Our converter uses native UTF-8 byte array mapping, ensuring full support for non-Latin character sets, Bengali scripts, and emojis without encoding errors.
What is a Base64 Data URI?
A Data URI includes a media type prefix (e.g., data:image/png;base64,) before the Base64 payload, allowing web browsers to render images inline without external files.
What is URL-Safe Base64?
Standard Base64 uses + and / characters, which have special meanings in web URLs. URL-Safe Base64 replaces + with - and / with _ so the string can be safely placed in query parameters.
Are my uploaded files safe?
Yes. File conversion uses JavaScript FileReader APIs locally in your browser. Files are never uploaded to any remote server.
Can I decode a Base64 string back into a PDF or Image file?
Yes. When in Decode mode, if the string represents an image or file, the tool displays a live preview and provides a Download Decoded File button.
Is this tool free for unlimited use?
Yes. You can encode and decode unlimited text and files completely free without registration.