Supported local records
Stored diagrams, electron counts, geometry, angles, hybridization, molar mass and composition.
Free chemistry learning tool
Free Online Lewis Structure Generator
Enter a chemical formula or common name to view a supported Lewis structure. See available valence-electron counts, geometry, bond angles and an illustrated guide that explains how the answer is built.
Free to use · No signup · PNG and SVG downloads
Detailed Lewis results are limited to supported compounds
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Result: Water (H₂O)
Local Lewis recordEducational reference only. Verify important answers with course materials. Unsupported inputs may show a PubChem 2D structure reference, which is not necessarily a Lewis dot diagram.
Do not just copy the pictureOpen the guide to understand electron counting, lone pairs, formal charges and geometry.
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Try Common Lewis Structures
Select a supported example to generate its stored diagram and molecular properties.
Browse all supported molecules and detailed guides →auto_stories
Learn the Method with Pictures
The generator gives you a result. The illustrated guide shows why that result is correct, one electron move at a time.
Start with the budget
Count every valence electron
Fix the total before drawing so dots and bonds cannot appear from nowhere.
Find the problem
Check the central atom
Using all electrons does not guarantee a valid structure. Verify octets.
Verify the answer
Check charges and geometry
Finish by confirming electron totals, formal charges and VSEPR shape.
Six illustrated steps, one complete worked example
Follow CO₂ from the periodic table to the final O=C=O structure, then apply the same method to NH₃ and H₂O.
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Step-by-Step Lewis Structure Guides
Each guide explains electron counts, connectivity, lone pairs, formal charges, resonance and molecular geometry for one compound.
H2O Lewis structureTwo lone pairs and bent geometryCO2 Lewis structureTwo double bonds and linear geometryNH3 Lewis structureOne lone pair and pyramidal shapeCH4 Lewis structureFour single bonds and tetrahedral geometryO3 Lewis structureResonance and formal chargesSO2 Lewis structureResonance conventions and bent shapeBF3 Lewis structureIncomplete-octet exceptionPCl5 Lewis structureExpanded octet and bipyramidal geometrySF6 Lewis structureSix bonds and octahedral geometryHNO3 Lewis structureOxyacid resonance and chargesCH3OH Lewis structureMethanol connectivity and lone pairsC2H4 Lewis structureC=C double bond and planar carbonCCl4 Lewis structureChlorine lone pairs and nonpolarity
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Learn, Generate and Practice Lewis Structures
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Illustrated generator with steps
Follow an illustrated method for electron counting, skeleton selection, lone pairs, multiple bonds and final checks.
quizPractice problems
Work through randomized formulas, reveal hints and compare your drawing with the detailed answer guides.
balanceFormal charges and resonance
Learn the formal-charge equation, compare candidate structures and draw resonance contributors correctly.
electric_boltIons and ionic compounds
Understand brackets, total charge, electron addition or removal and the limits of molecular Lewis diagrams.
hubOrganic chemistry structures
Review carbon valence, condensed formulas, multiple bonds, functional groups and formula ambiguity.
view_in_arLewis structure vs 3D geometry
See why a Lewis diagram is 2D and how VSEPR converts electron domains into a three-dimensional molecular shape.
How the online generator works
Stored Lewis Data with a Clearly Labeled Fallback
Detailed diagrams and properties come from a curated local database. The site does not claim to calculate every possible Lewis structure from first principles.
When a formula is not locally supported, the tool may query PubChem and display a conventional 2D compound image. That reference can omit electron dots, lone pairs, resonance contributors and Lewis-specific formal-charge information.
Free downloads
Save the displayed Lewis structure as a PNG or SVG file directly in the browser.
Molecular geometry
Available records include VSEPR geometry names and representative bond angles.
Transparent limits
Unsupported, ambiguous and model-dependent cases are documented instead of being presented as guaranteed answers.
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Frequently Asked Questions
Is this Lewis structure generator free and online?
Yes. It runs in a browser, requires no account and is free to use. Generated diagrams can be downloaded as PNG or SVG.
Does the Lewis dot structure generator show steps?
The main tool displays the stored result and a direct learning link. The illustrated guide explains electron counting, bonds, lone pairs and formal-charge checks step by step.
Does it generate 3D Lewis structures?
No. Lewis structures are two-dimensional electron diagrams. The site provides geometry names and bond angles for supported records, but it is not an interactive 3D molecular viewer.
Can it generate resonance structures and formal charges?
The local generator may display one stored representation. The formal-charge and resonance guide explains how to evaluate and draw all required contributors.
Does it support ionic compounds?
It supports selected polyatomic ions and charged species. A Lewis structure for an ionic compound may require separate bracketed ions rather than one covalent molecular diagram.
Does it support organic chemistry Lewis structures?
Selected organic molecules are stored locally, but one molecular formula can represent several isomers. Use the organic chemistry guide to understand connectivity and formula ambiguity.
Are PubChem results Lewis dot structures?
Not necessarily. PubChem usually returns a conventional 2D chemical structure and may omit lone pairs, electron dots and formal charges.