KUON Hatanaka
Compress / decompress RINEX observations with the Hatanaka format (.crx ⇄ .obs) — free, no account.
Processing uses RNXCMP (GSI, Y. Hatanaka / crx2rnx · rnx2crx). As required for embedded use, we cite Hatanaka, Y. (2008), Bull. GSI, 55, 21-30. Lossless, but the decompressed file may not be byte-identical to the original (trailing-whitespace normalisation is per RNXCMP; the observation values are identical). Your data is auto-deleted after 24 hours. No account required.