Share chemistry workflows, ask questions, vote on ideas, and follow feature requests.

Ask chemistry drawing questions and shape MolDraw features

The MolDraw Community helps students, researchers, educators, and computational chemists discuss chemical structure drawing, editor workflows, molecule export, 3D visualization, spectra tools, and requested improvements to the free MolDraw web app.

What can I do here?: Read public discussions, post workflow questions, reply to threads, upload images or short videos, and upvote ideas after signing in.
How are feature requests handled?: Users can upvote requests. Admins can mark requests as new, under review, under progress, or done.

Community Guidelines

MolDraw Community

Maxim1 Janzen 35 karma

Student · 2026-09-18 16:07 UTC

Some bugs

Hi, i really like your update but there is a problem with some things. First i realized now that sometimes editing/deleting posts does not work. In the pictures you can see several problems: - wrong 3d structure at the chiral center when changing the wedge direction - weird LP placement of third LPs (didnt test more than 3) - a button to add one to all of them would be nice so not each atom would have to be clicked - replacing atoms with an h fails and a methyl group is added instead - some lps are drawn wrong when choosing electron flow - in electron flow mode it is not always possible to choose the middle of a bond as endpoint - when a bond is chosen as starting point and an atom as endpoint it often points wrongly which corrects itself when some atoms are deleted (no picture, but could be done on request) Then it is also slightly annoying that enter in the forum results in the post being posted immediately as it is usually used for newlines. It would be nicer if you could only post by clicking the button or have a confirmation before hand. Thanks for your dedication and continued updates. Best Maxim

Image / video

Rafeeque Admin 624 karma

Other · 2026-11-07 08:31 UTC

New DNA/RNA builder plugin is live!

Image / video

Rafeeque Admin 624 karma

Other · 2026-11-05 06:54 UTC

New peptide builder plugin

Image / video

Rafeeque Admin 624 karma

Other · 2026-11-05 06:51 UTC

Peptide Builder | New Plugin is now available

Image / video

Yuri Dias 10 karma

Student · 2026-11-02 18:23 UTC

Hi! I'm new to chemistry and was drawing caffeine in MolDraw. While making a ring with carbon and n…

Hi! I'm new to chemistry and was drawing caffeine in MolDraw. While making a ring with carbon and nitrogen atoms, the program automatically added hydrogens to some nitrogen atoms, showing "NH". Why does this happen? Is it related to nitrogen's bonding rules, and how can I prevent it?

Image / video

Luis Martin+Moldraw 33 karma

Student · 2026-11-02 09:28 UTC

chemical structure with wrong chemical properties

I just realized, big problem

Image / video

Rafeeque Admin 624 karma

Other · 2026-10-30 13:57 UTC

New cage molecules are added in Library

Image / video

jorgeortex 10 karma

Student · 2026-10-29 01:15 UTC

Windows app down

Why is the app down? Is there a problem

Image / video

Rafeeque Admin 624 karma

Other · 2026-10-27 08:30 UTC

You can adjust the toolbar layout now.

@ramon Make toolbar to more cleaner and compact two column layout if you prefer that

Image / video

vanderson 44 karma

Researcher · 2026-10-22 06:38 UTC

Rank conformers by potential energy.

Excellent changes. The program is a great help to my students. A suggestion for improvement would be to include the energies of the generated conformers (from most to least stable). Currently, they are only listed.

Image / video

vanderson 44 karma

Researcher · 2026-10-22 06:36 UTC

MolDraw turns –SH into SH5 when I add a charge —

Hi, I’m using MolDraw and noticed something odd. On a benzene ring with an –SH group, the + and – charge tools turn it into SH₅⁺ or SH₅⁻. I’d expect something like R–SH₂⁺ or R–S⁻. With –OH the tool works as expected (O⁻ and H₂O⁺), so it seems like an issue with how the charge tool handles sulfur. Is this a bug, or am I doing something wrong?

Image / video

Join the community

Read freely. Sign in to post, comment, upload images, or upvote.

What's new See all updates

New

Interactive Course

Learn MolDraw by doing. Watch a short demo, then draw in the real editor. Instant checks and hints.

Start free lesson

Build MolDraw together

Vote on feature requests, share workflows, and help prioritize the chemistry tools researchers need next.

DiscussionsAsk and answer workflow questions.
Feature requestsSupport ideas and track progress.
Admin updatesRequest status changes appear here.

Read Community Guidelines

Maxim1 Janzen 35 karma

Student · 2026-09-18 16:07 UTC

Some bugs

Rafeeque

Rafeeque Admin 624 karma

Other · 2026-09-18 16:42 UTC

@maxim1janzen Hi Maxim, Thanks for all comments. We have started working on them. Will update you soon

Rafeeque

Rafeeque Admin 624 karma

Other · 2026-09-18 19:43 UTC

@maxim1janzen 1) fixed: - wrong 3d structure at the chiral center when changing the wedge direction 2) can you explain this what you meant, thanks? : - a button to add one to all of them would be nice so not each atom would have to be clicked 3) fixed: - replacing atoms with an h fails and a methyl group is added instead 4) fixed: Then it is also slightly annoying that enter in the forum results in the post being posted immediately as it is usually used for newlines. It would be nicer if you could only post by clicking the button or have a confirmation before hand. other comments are being addressed and will update you when fixed

Rafeeque

Rafeeque Admin 624 karma

Other · 2026-09-18 20:52 UTC

@maxim1janzen 5) fixed: lone pair placement is mostly fixed. if anything behaves abnormal, let me know

Maxim1 Janzen

Maxim1 Janzen 35 karma

Student · 2026-09-22 07:52 UTC

Thanks a lot for fixing all of these issues. I think it is quite nice already. I noticed that you implemented the add all lone pairs feature as "add one lone pair to all", would it perhaps be possible to have "Add all lone pairs", which adds all of the possible ones to all respective atoms at once? I think that would reduce a great number of clicks that would need to be done. It would also be nice to have the same kind of view of possible lone pairs when drawing the electron flow arrows like in the last picture in this post, it was removed since the last update but i think it was quite nice. Then a few new thing, i saw that the copy smiles (it would be nice if it was possible to import smiles also) and copy svg buttons are not working at least on my linux machine with chrome and firefox. Also the advanced export button seems to be doing nothing. And when i try to do a MMFF94 optimization i get an error about openChemLib failing to load. I hope this feedback is useful for you. Thanks for the continued updates.

Rafeeque

Rafeeque Admin 624 karma

Other · 2026-09-22 10:28 UTC

Hi Maxim, Thanks for the feedback. Very helpful. We have solved most of the things. I will update you soon when all updates are live.

Rafeeque

Rafeeque Admin 624 karma

Other · 2026-09-22 11:04 UTC

Hi Maxim, @maxim1janzen Thanks for the detailed notes. These are in now. Please hard-refresh the site once so you are not on an older cached page. (ctrl + f4) 1) Add all lone pairs now adds every possible lone pair on every atom in one click. Add one lone pair to all is still there if you only want a single pair on each atom. 2) While you draw an electron-flow arrow, possible lone-pair sites show again, and they go away after the arrow is placed. 3) Copy SMILES and Copy SVG should work now can you check?. Import SMILES is next to Copy SMILES. 4) Advanced export (check now?) 5) MMFF94 loads OpenChemLib again, so that optimization should run (check now?)

Image / video

What's new in MolDraw