twineconvert

free · in-browser · no upload

JSON to Bencode
Converter

Drop your JSON file. We'll convert it to BENCODE right here in your browser, your file never leaves your device.

or drop your file

Select your file here to get started

or drop your file here.

Accepts .json

nothing uploaded no file size cap no signup

How it works

Three steps. No upload, no signup.

  1. 1

    Drop your file

    Click the dropzone above or drag a JSON from your desktop. Files of any size, there's no upload, so there's no upload limit.

  2. 2

    Convert in your browser

    The conversion runs entirely in this tab using JavaScript and WebAssembly. Your file never touches our servers, we don't have any.

  3. 3

    Download

    Get your BENCODE the moment the conversion finishes. Convert another, or close the tab.

Files stay on your device

Your file is never uploaded. The entire conversion runs in your browser using WebAssembly. We can't see what you convert because we have no server to see it.

No file size limit

Server converters cap free users at 1-2 GB and gate larger files behind a paid plan. Since nothing uploads, our limit is whatever your browser can handle.

Free, no signup, no ads on conversions

No account required. No watermark on the output. No queue. Drop a file, get a converted file.

Why convert JSON → Bencode

What this conversion is actually for

If you authored or modified a torrent structure as JSON (changed the announce URL, edited file paths, added a custom field), you need it back in bencode so a BitTorrent client will accept it. This re-encodes a fasta-to-json-shaped JSON back into the bencode dictionary format and writes a .torrent file you can hand to qBittorrent or Transmission.

A real example

You wanted to add a custom comment to a torrent. Decode with bencode-to-json, edit the JSON, convert back here, replace the original .torrent.

Troubleshooting

The resulting .torrent is rejected by my client.

Bencode is strict about types: the info dictionary keys must be byte strings in sorted order, and integer fields (piece length, length) must be JSON integers, not strings. If you stringified an integer field by accident during editing, the BitTorrent client will reject the info-hash. Verify the integer types in the JSON before re-encoding.

Formats involved

About JSON and BENCODE

JSON, JavaScript Object Notation

JSON is a lightweight text format for structured data, nested objects, arrays, strings, numbers, booleans. It's the lingua franca of web APIs, configuration files, and data interchange between programs. Human-readable when formatted, machine-parseable in every programming language, and roughly half the size of equivalent XML.

How to open

Any text editor reads JSON. Browsers display .json files in a formatted tree view. VS Code and similar editors highlight syntax.

Full JSON format guide →
BENCODE, BENCODE

BENCODE is a file format we support converting. Detailed format information is being added, for now, drop your file in the converter above and you'll get the conversion you came for.

How to open

Most operating systems open this format with a default application; if not, search for a free reader/viewer for the format.

Full BENCODE format guide →

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FAQ

Common questions

Is this JSON → Bencode converter really free?

Yes. No signup, no watermark, no daily file count limit. Every conversion runs in your browser, your file never touches our servers because there are no servers.

Where does my file go when I convert it?

Nowhere. The conversion runs entirely in your browser using JavaScript and WebAssembly. Your file is never uploaded to our servers. We don't have any servers handling files, there's nothing for us to log, store, or accidentally leak.

What's the maximum file size?

Whatever your browser can hold in memory. Practically, this means a few hundred MB on most computers, significantly larger than the 1-2 GB caps that server-upload converters charge for. Very large files (multi-GB) may require closing other browser tabs first.

Why convert JSON to BENCODE?

API responses, configuration files, structured data interchange. File interchange. The most common reason to convert is compatibility, BENCODE works in places where JSON doesn't, or vice versa.

How do I open a JSON file in the first place?

Any text editor reads JSON. Browsers display .json files in a formatted tree view. VS Code and similar editors highlight syntax.

Does this work offline?

Once the page is loaded, the conversion itself runs entirely offline. The first time you use a tool, your browser downloads the conversion library (a one-time cache). If you reload while offline, the page won't load, but you can install the site as a Progressive Web App for full offline use.

Can I convert multiple files at once?

Single file at a time for now. Batch conversion is on the roadmap, for now, drop one file, download the result, then convert the next.