Although blobs (and strings) are presently limited to length 2^31-1, (per [Limits in SQLite](https://sqlite.org/limits.html), at section 1), those ..blob64 APIs evince a clear intention to expand that limit. (Otherwise, they would be useless.) There have been recent changes allowing increased DB size as well. Hence, to your question, > Any chance sqlite3_blob_write64 to be added soon? , the answer seems to obviously be "yes". As to whether there is a work-around, the above-referenced limits say "no". You may have noticed that the ..blob64 APIs were not documented except for signature. Perhaps a note in the function description text should state that the 2^31-1 length limit still applies. (Or, if not, the limit needs restating.)