SQL Server to Firebird Converter

Selected tables into a Firebird database, with editable mappings for a one-time load or a scheduled synchronization job.

Version: 5.0.53
Release Date: Sept. 30, 2026
Size: 23.5 MB
Platform: Windows 10 or later

Download DBConvert Order from US$ 199

Rather not run it yourself?

Let us do the migration →

Copy SQL Server tables into a Firebird database. DBConvert proposes the target column types, creates the selected schema, and transfers rows through a live connection to each server.

Reads SQL Server, SQL Server Express, Azure SQL Database, or Amazon RDS for SQL Server.
Writes to a local or remote Firebird server database, identified by its file path or alias.
Runs on Windows as a desktop application.
The same download converts Firebird back into SQL Server.

This application also converts SQL Server to InterBase. Review the target mappings against your InterBase version rather than assuming Firebird's type support applies. See the InterBase migration notes for connection and schema considerations.

Prepare a repeatable Firebird load

Connections, tables, and mappings remain available on separate screens as you prepare the job.

Limit the source data

Select individual tables and apply per-table row filters for a subset load rather than copying the entire server database.

Adjust the target schema

Review flagged tables and edit column names and types before loading. Choose mappings compatible with the Firebird version and the application that will read the result.

Save the job

Reuse saved connections and retain the selected tables, mappings, and options for the next test run. Job settings stay together instead of being entered again for each load.

Convert once, or keep Firebird in step with SQL Server

Conversion and synchronization are modes of one application.

One-time conversion

Create the Firebird schema and load its rows for a migration. Validate the resulting data and run the application's queries before switching the write target.

Scheduled synchronization

Keep SQL Server operational while the Firebird destination is prepared. Schedule a saved job, with explicit direction, synchronization keys, and conflict handling.

When Firebird is the right target

An application built on Firebird

Bring existing SQL Server data into a replacement application whose database runs on Firebird. Use the mapping controls to adapt the incoming columns to its schema requirements.

A Firebird test environment

Populate a development database with a representative dataset to test query compatibility and application behavior before committing to a platform change.

How SQL Server types map to Firebird

Review the proposed declarations against your data. Similar type names do not guarantee the same precision, encoding, or generated-key behavior in the target application.

In SQL Server	DBConvert default in Firebird	What needs attention
`INT`, `BIGINT`, identity keys	`INT` and `BIGINT` retain their type names.	Check generated-key settings and the next value before inserts resume. Do not assume SQL Server seed and increment behavior transfers unchanged.
`DECIMAL`, `NUMERIC`, `MONEY`	`DOUBLE PRECISION` by default, including `SMALLMONEY`.	Floating-point storage can round exact amounts. Override the mapping to a suitable fixed-point declaration when exact decimal arithmetic is required; check the target version's capacity.
`NVARCHAR`, long text, `XML`	Bounded `NVARCHAR` becomes `VARCHAR`. `VARCHAR(MAX)`, `NVARCHAR(MAX)`, `TEXT`, `NTEXT`, and `XML` become `BLOB SUB_TYPE TEXT`.	The current text-BLOB writer encodes values as UTF-8. Use a `UTF8` target connection; test lookup and sorting behavior separately.
`DATETIMEOFFSET`	`TIMESTAMP`, not `TIMESTAMP WITH TIME ZONE`, even on Firebird 4 or 5.	The source offset is not retained. If the application needs it, store it separately or choose another representation before loading.
`DATETIME2`, `DATE`, `TIME`, `BIT`	`TIMESTAMP`, `DATE`, `TIME`, and `SMALLINT`, respectively.	Firebird timestamps have four fractional-second digits; SQL Server `DATETIME2(7)` has seven. Check reduced timestamp precision and how the application reads `SMALLINT` boolean values.
`VARBINARY`, `IMAGE`, `UNIQUEIDENTIFIER`	Binary values become `BLOB SUB_TYPE 0`; GUIDs become `CHAR(38)`.	Check binary payloads and the GUID format expected by the Firebird application.

T-SQL logic is not converted into PSQL

Stored procedures, triggers, computed expressions, SQL Server Agent jobs, users, and permissions need a separate migration plan. Rewrite application queries that depend on SQL Server-specific behavior.

Supported versions and services

SQL Server

SQL Server 2008-2022, including Express editions
Azure SQL Database and Amazon RDS for SQL Server
SQL Server schemas (dbo, custom schemas)
Windows authentication or SQL authentication

Firebird

Firebird 2.x, 3.x, 4.x, 5.x and InterBase

DBConvert Studio

30+ databases · cloud · scheduled sync

Need more directions or unattended sync? One tool covers them all.

How to migrate SQL Server to Firebird

DBConvert opens in GUI mode and walks the job from connection to commit:

Connect to SQL Server source database

Specify the username/password and host/port parameters if your source database requires login credentials.

SQL Server source

Connect by TCP/IP or Named Pipes, use Azure SQL, or read from Amazon RDS for SQL Server.

Connect to Firebird destination database

Specify parameters for the destination database similar to the source, defining connection settings and username/password pairs.

Firebird target

Enter the database path on the Firebird server, or its alias, and select the connection character set. See Firebird target settings. Unsupported requests for connection protection are refused rather than silently ignored.

Steps 3-6: the same for every database pair

Source and target are connected - steps 1 and 2 above. What follows is identical whichever two databases you picked, so it lives in one place. Each step below opens at its own section.

Open the full guide

All four steps in one page, plus software features, command-line mode, scheduler, and system requirements.

See all features

More guides for SQL Server ↔ Firebird

Move SQL Server data into Firebird

Download the current build and run the first job against your own database.

Download DBConvert 5.0.53 Order from US$ 199

Windows 10 or later · 23.5 MB