Free database tools
Every dbdiagramr tool in one place. Pick what you need: diagrams, health checks, generators. All free, no signup, private by default.
Supabase RLS Check
Connect with a read-only role and see which public tables have RLS off, RLS with no policies, or RLS on with policies to review.
PostgreSQL ER Diagram
Paste a connection string and see your live PostgreSQL schema as an interactive ER diagram in under 10 seconds.
Schema Health Analyzer
Paste SQL and get a graded schema health report: missing keys, unindexed foreign keys, naming drift, each with a fix.
SQL Formatter
Paste messy SQL and get clean, consistently formatted PostgreSQL. Keyword casing, smart indenting, copy or download.
CSV to SQL
Drop in a CSV and get CREATE TABLE with detected types plus INSERTs. File never leaves your browser.
JSON to SQL
Paste JSON and get CREATE TABLE + INSERTs. Nested objects become linked child tables.
SQL Validator
Check PostgreSQL syntax with the real Postgres parser. Line-level errors, private, instant.
SQL to Mermaid
Paste CREATE TABLE and get erDiagram code for GitHub READMEs, Notion, and docs.
SQL to TypeScript
Generate TypeScript interfaces and Zod schemas from PostgreSQL DDL. Nullables handled.
SQL to Prisma
Turn CREATE TABLE into schema.prisma with native types, ids, and relations mapped.
Connection String Builder
Build or decode PostgreSQL URIs with Supabase, Neon, and Railway presets. Passwords stay local.
Schema Diff
Paste two schema versions and get the structural diff plus the ALTER statements to migrate.
PR Schema Diff Action
GitHub Action that comments a schema diff, migration preview, and Mermaid ER diagram on every PR touching your Postgres migrations.
DBML to SQL
Convert DBML Tables and Refs to PostgreSQL DDL, or SQL back to DBML, in one click.
Prisma ERD
Paste schema.prisma and see every model and relation as an interactive ER diagram. No install.
Just want to see your database?
Paste a PostgreSQL connection string and get an interactive ER diagram in under 10 seconds. No signup, no setup.