SQL EXPLAIN Visualizer Online — Free Execution Plan Analyzer
Paste your EXPLAIN or EXPLAIN ANALYZE output and see your query execution plan as a visual tree. Spot full table scans, index usage, and performance bottlenecks without deciphering raw plan text.
Why Visualize SQL Execution Plans?
Raw EXPLAIN output is powerful but hard to read. A moderately complex PostgreSQL query can produce 30+ lines of nested plan text with cost estimates, row counts, filter conditions, and join types scattered across multiple indentation levels. Tracking which node is scanning a 100,000-row table without an index requires careful, line-by-line inspection.
An online EXPLAIN visualizer transforms that wall of text into a color-coded tree diagram. Full table scans are flagged red. Index usage gets a green checkmark. Nested loops, hash joins, and merge joins are color-differentiated. Cost estimates and actual timing appear right alongside each node, so you can see at a glance which part of your query is eating up the most resources.
The tool auto-detects whether your output came from MySQL (tabular format with columns like type, key, rows, Extra) or PostgreSQL (tree format with cost, rows, actual time annotations). No configuration required — paste and the parser identifies the dialect automatically.
Tree Diagram View
Nested execution plans rendered as an indented tree with operation icons, not flat text.
Table Scan Detection
Full table scans and high-row-count nodes flagged immediately so problems jump out.
MySQL & PostgreSQL
Auto-detects dialect and parses both tabular MySQL output and tree-formatted PostgreSQL plans.
Performance Insights
Automatic recommendations for missing indexes, high-cost operations, and query rewrites.
100% Client-Side
All parsing runs in your browser. EXPLAIN output never leaves your device.
Instant Results
No server round-trips. See the tree diagram the moment you click Analyze Plan.
How to Use the EXPLAIN Visualizer
Run EXPLAIN or EXPLAIN ANALYZE on your query in any PostgreSQL or MySQL client, copy the output, and paste it into the tool. Click Analyze Plan to see it rendered as a tree. Each node shows the operation type (Seq Scan, Index Scan, Hash Join, etc.), estimated cost, row count, and any filter or index conditions.
For PostgreSQL users, EXPLAIN ANALYZE provides actual execution timing and per-loop row counts — far more useful than estimates alone. The visualizer displays these alongside the cost estimates so you can compare what the planner predicted versus what actually happened.