Is converting ACCDB to Postgres free?

Yes. Files up to 10MB convert free with no account. There is a limit of five conversions per day per IP address.

Will my ACCDB data keep its types in Postgres?

Yes — that is the point. Whole numbers, decimals, dates and booleans are mapped to real Postgres types rather than everything becoming text. The mapping table above shows exactly what you get.

Do you store my file?

No. The file is written to a temporary directory, converted, and the directory is deleted as soon as your download has been sent.

Convert ACCDB to Postgres

Upload a .mdb or .accdb or .mde file and get back a Postgres SQL script you can load straight into your database. Types are preserved rather than flattened to text. Free, no registration, up to 10MB.

1Upload your file

Click to upload or drag and drop

CSV, Excel, SQLite, SQL, DBF (max 10 MB)

2Choose target format

How your data is typed in Postgres

Generated from the converter's own Postgres type mapping — this is what it actually emits, not an example.

Your data	Postgres type
Whole number	BIGINT
Decimal (money)	NUMERIC(10,2)
Floating point	DOUBLE PRECISION
True / false	BOOLEAN
Date	DATE
Date and time	TIMESTAMP
Short text	TEXT
Long text	TEXT
Binary data	BYTEA

Working from an .accdb file

An .accdb file uses ACE, the engine that replaced Jet from Access 2007 onward. It adds attachment and multi-value fields that have no equivalent in any relational target, so it is worth knowing what happens to them before you convert.

→Ordinary tables and columns convert exactly as they do from .mdb - the reader is the same one.
→Attachment and multi-value fields have no relational equivalent and no type of their own here: they fall back to text columns rather than stopping the conversion.
→ACE supports a genuine database password, and there is no way to supply one to the reader - remove the password in Access before uploading.
→The recognised Access extensions are .mdb, .accdb and the compiled .mde. A compiled .accde front-end is not among them, so upload the .accdb it was built from.

The oldest PostgreSQL this loads into

Postgres is the informal spelling and the one most people type. Since the name says nothing about a version, the useful question for this page is which server releases the generated script runs on, and that is decided by the newest piece of syntax in it.

→The identity clause on auto-increment columns is the newest thing in the file, and it arrived in release 10. That is the floor for loading the script unedited.
→Everything else is far older: the hex escape the script uses for binary values has been accepted since 9.0, and jsonb, which is what a JSON column is declared as, since 9.4.
→On a server below the floor the script still loads if you delete the identity clauses by hand. The columns keep every value they were given, because each INSERT names them explicitly; they simply stop assigning new ones.

Reading ACCDB

→Dates are exported in ISO form, avoiding the ambiguous 12/02/21 that Access tools produce by default.
→NULL and the empty string stay distinct.
→Access can hold dates outside the range it can represent. Those become NULL and the conversion tells you, rather than dropping them silently.
→Requires mdbtools on the server; if it is unavailable you get a clear error rather than a partial conversion.

Writing Postgres

→Backslashes are left alone, because PostgreSQL treats them as ordinary characters — doubling them would corrupt every Windows path.
→Auto-increment columns become GENERATED BY DEFAULT AS IDENTITY.
→Binary data is written as bytea, and identifiers respect the 63-character limit.

What you get

A ZIP containing dump.sql, plus a README with the exact command to load it. If anything about your data needed a judgement call, a _warnings.txt explains it.

Load this dump into PostgreSQL:

  psql -U USER -d DATABASE -f dump.sql

Create the database first if it does not exist:

  createdb -U USER DATABASE

Questions

Is converting ACCDB to Postgres free?: Yes. Files up to 10MB convert free with no account. There is a limit of five conversions per day per IP address.
Will my ACCDB data keep its types in Postgres?: Yes — that is the point. Whole numbers, decimals, dates and booleans are mapped to real Postgres types rather than everything becoming text. The mapping table above shows exactly what you get.
Do you store my file?: No. The file is written to a temporary directory, converted, and the directory is deleted as soon as your download has been sent.