Dictionary Converter — Matcha Reader Tools

📚 Dictionary Converter

Converts a dictionary into the reader's binary lookup format (.idx + .dat), including the .spx sidecar that makes on-device lookups fast.

1. Choose a dictionary file

Tap to choose a Yomitan .zip, jmdict-simplified .json / .json.tgz, or MDict .mdx

Recommended sources: Jitendex (vocabulary, Yomitan format), JMnedict in Yomitan format (names), or a grammar reference in Yomitan format. MDict .mdx also works.

MDict registration (encrypted .mdx only)

Registration code — 32 hex characters, from the dictionary's owner Email or device ID — whichever the code was registered to

2. Which dictionary slot is this?

Output name — determines the filenames the device expects

Large dictionaries (Jitendex is ~60 MB) take a minute and some memory to convert — everything stays on your device.

Install on the device

The download is a zip containing a dict/ folder. Unzip it at the SD card root (or upload the files into /dict/ via the reader's Wi-Fi web file transfer). After installing all three dictionaries your card looks like:

/dict/
  vocab.idx  vocab.dat  vocab.spx      (vocabulary — required)
  names.idx  names.dat  names.spx      (names — optional)
  grammar.idx  grammar.dat  grammar.spx   (grammar — optional)