Base58 (Bitcoin Alphabet) File Encoder-Decoder Converter

BaseN File Encoder & Decoder - Convert any file to and from Base-N text

What does this BaseN file encoder-decoder do?

This tool encodes any file into a Base-N text representation and decodes Base-N text back into a downloadable file, entirely in your browser. Upload a file to turn its raw bytes into Base2, Base16, Base32, Base58, Base64, Base85, Base91, or one of the other supported bases, then copy the result. Paste Base-N text into the encoded-text field and download the reconstructed file. Because everything runs locally with no upload to any server, it is well-suited for encoding images, documents, archives, or binary blobs for transport through text-only channels. For plain-text conversion, use the BaseN Text Encoder-Decoder.

How do I encode a file to Base64 (or another base)?

Select the base you need, then drag a file into the upload area or browse for one. The tool reads the file's bytes and immediately renders the encoded text, which you can copy with a single click. Base64 is the most common choice for embedding files in JSON, data URLs, email attachments (MIME), and HTML, because it maps every 3 bytes of binary data to 4 ASCII characters that survive text-based transport intact.

How do I decode Base-N text back into a file?

Paste the encoded text into the encoded-text field and click "Download Decoded File". The tool converts the characters back into the original bytes and hands you the reconstructed file. This is useful for recovering an attachment, image, or binary payload that was shared as a Base64 or other Base-N string.

Why encode a file as text instead of sending it as binary?

Many systems only handle text reliably - JSON APIs, email bodies, XML, configuration files, URLs, and clipboards can corrupt or strip raw binary bytes. Encoding a file to Base-N produces a printable-ASCII string that passes through these channels unchanged, then decodes back to a byte-for-byte identical file on the other end.

Which base should I use for encoding files?

Base64 is the standard default for general-purpose file transport and the widest compatibility. Choose URL-safe Base64 when the encoded file will appear in URLs or HTTP headers, since it replaces + and / with - and _. Use Base32 for case-insensitive or manually transcribed contexts, Base58 for cryptocurrency-adjacent data that avoids look-alike characters, and Base85 or Base91 when you want denser output than Base64 at the cost of a less common alphabet.

How much larger does a file get after Base-N encoding?

Encoding always adds overhead because binary is repacked into a smaller alphabet. Base64 grows a file by about 33%, Base32 by about 60%, and Base16 (hex) doubles the size. Denser schemes such as Base85 (roughly 25% overhead) and Base91 produce more compact output, while Base2 (binary) is the largest, expanding each byte to eight characters.

Is my file uploaded to a server?

No. Reading, encoding, and decoding all happen locally in your browser using client-side JavaScript. Your file never leaves your device, which keeps sensitive documents, keys, and archives private.

Can I use a custom alphabet?

Yes. The advanced custom-alphabet field lets you override the character set used for encoding and decoding. This is handy for non-standard Base-N variants or bespoke encodings, as long as the same alphabet is used on both ends. Related tools include the Negabinary Converter and other data converters.