Open .DB3 files online
A .db3 file is a SQLite database under the compact third spelling — used by a lineage of desktop tools, scientific software, and teaching materials, and byte-identical to .db/.sqlite/.sqlite3 inside. Drop it on the page and it opens entirely in your browser: per-table grids, folded CREATE statements, honest NULL/BLOB rendering, CSV export per table, nothing uploaded.
Because the bytes decide — not the extension — the viewer checks the real SQLite format 3 header and opens any of the four spellings identically. A .db3 that is actually another format refuses with a clear message instead of rendering noise.
What is a `.db3` file?
SQLite's one-file format: schema, tables, and indexes in pages behind a 16-byte SQLite format 3\0 header. The .db3 spelling is rare relative to .db but appears in Delphi/C++ tooling, some scientific software, and older teaching materials — all of it the same format version 3.
MIME type: application/vnd.sqlite3. The extension is a convention only; SQLite itself never requires it.
- Legacy desktop and scientific application data
- Teaching materials and textbook datasets
- Migrated archives where the original tool chose the spelling
- Reading an old backup without hunting down its parent app
How to open a `.db3` online
Open ZipTool in a new tab, then drop your .db3 onto the page — or click to browse for it, or paste a URL. The file opens in the SQLite table viewer, one grid per table with its schema, read entirely on your device.
- Drag your
.db3onto the page — or click to browse, or paste a URL. - It opens immediately in the SQLite table viewer, one grid per table with its schema. No install, no sign-up.
- Read, search, or copy it. Your file never leaves your browser.
Open `.db3` without uploading
Most "open db3 online" sites work by uploading your file to a server and processing it there. ZipTool does the opposite: it loads its parser once, then reads your .db3 locally in the browser tab. The contents stay on your device.
You can prove that in seconds. Open the page, press F12 for DevTools, switch to the Network tab, and open your file — no request carrying the file's contents is sent. You can also turn off Wi-Fi after the page loads and the file still opens. See security and privacy for the full picture.
Frequently asked questions
How do I open a .db3 file online?
Drag the .db3 onto the page (or click to browse, or paste a URL). The database opens in the SQLite viewer — every user table as a grid with its CREATE statement, up to 1,000 rows per table, and a per-table CSV download. The file is decoded entirely in your browser and never uploaded.
Can I view a .db3 without uploading it?
Yes. The SQLite engine runs as WebAssembly inside your browser tab — the database never leaves your machine, which matters because databases are usually full of someone's real data. Confirm it with DevTools (F12, Network tab): no request carries your file.
Does it show every row and column?
Every column, and the first 1,000 rows of each table (stated right in the viewer, with a CSV export of exactly what is shown). Very long text values are trimmed for display at 512 characters, and binary BLOB values show as a size placeholder rather than their raw bytes.
Can I run SQL queries?
Not in this viewer — it is a reader: browsing tables, inspecting the schema, and exporting CSV. The engine under it is real SQLite compiled to WebAssembly, so interactive queries are a genuine possibility, but nothing promises them today.
Why does my .db3 file fail to open?
The file is probably not a SQLite database — a renamed file, a partial download, or an encrypted database. ZipTool checks the 16-byte SQLite format 3 header before doing anything else and refuses with a clear message rather than rendering garbage.