What the Base64 Encoder/Decoder Does and Why It Matters
This tool converts text and files to and from Base64, the encoding that represents binary data using a safe set of printable characters. Encoding turns arbitrary bytes into an ASCII string; decoding reverses it back to the original content.
Base64 shows up wherever binary data has to travel through text-only channels: embedding an image in CSS or HTML as a data URI, attaching files in email (MIME), storing small blobs in JSON, or passing credentials in an HTTP header. Doing the conversion in the browser means even file contents never leave your device.
How to Use Base64 Encoder/Decoder
- Choose whether to encode or decode.
- Type or paste text, or select a file to convert.
- Run the conversion and review the output.
- For decoding, paste a Base64 string to recover the original text or file.
- Copy the result, or download it when the output is a file.
- Clear the fields when you are finished.
Supported Inputs and Limitations
Supported input
- Plain text in either direction
- Local files for encoding to Base64
- A Base64 string for decoding
What you get
- A Base64 string when encoding
- The decoded text or downloadable file when decoding
- Copy-ready output for code or configuration
Known limitations
- Base64 is encoding, not encryption; it offers no confidentiality and is trivially reversible.
- Encoded data is roughly one third larger than the original, which matters for large files.
- Decoding only succeeds on valid Base64; truncated or altered input will fail or produce garbage.
Privacy and Security
Encoding and decoding run entirely in your browser, so text and file contents are never uploaded to NovaTools. Nothing is stored after you close the tab. Remember that Base64 does not hide data — anyone can decode it — so never treat it as a way to protect secrets.
Frequently Asked Questions
Is Base64 a form of encryption?
No. It is a reversible encoding designed to make binary data text-safe. Anyone can decode it instantly, so it provides no security or confidentiality on its own.
Are my files uploaded when I encode them?
No. File reading and encoding happen locally in your browser using the File API, so the contents never leave your device.
Why is my decoded output empty or broken?
The input is probably not valid Base64 — it may be truncated, contain stray characters, or use a different variant. Re-copy the full string and ensure no characters were lost.