Local · Private · Free

Periodic Table

All 118 elements with every key property: atomic mass, category, electron configuration, electronegativity, phase and discovery year. Search by name, symbol or number. Hover for a quick look, click for the full picture.

Everything renders locally in your browser, nothing is searched or sent anywhere.

Tip: on small screens, swipe the table sideways. Lanthanides (57-71) and actinides (89-103) sit in the two rows below the main table.

Click any element to see its full properties here. ✦

Oxygen

Reactive nonmetal

Atomic number
Atomic mass
Group
Period
Block
Phase at STP
Electron config.
Electronegativity
Discovered

A reference that never needs the internet

The full dataset, atomic masses (2021 IUPAC standard values; bracketed mass numbers for elements with no stable isotope), shorthand electron configurations, Pauling electronegativities where defined, phases at standard conditions and discovery years, is embedded right in this page. Color the table by category, phase or s/p/d/f block, search by name, symbol or number, and copy any element's summary or download the whole dataset as JSON or CSV. No account, no upload, works offline. Free forever.

About Periodic Table

Periodic Table is a free, private chemistry reference that runs entirely in your web browser. It covers all 118 elements with atomic mass, electron configuration, Pauling electronegativity, phase at standard conditions and discovery year. Because everything happens locally on your device, nothing is uploaded to a server, there is no sign-up or installation required, and it keeps working offline. Like every free tool by Digital Heroes, it is 100% free with no limits.

What you can do

Search any element by name, chemical symbol or atomic number instantly.

Color the table by category, phase at STP, or s/p/d/f block with one click.

Hover any cell to see atomic mass, category and phase in a quick tooltip.

Click an element to open its full property panel: electron config, electronegativity, group, period and discovery year.

Copy an element summary as plain text, ready to paste into notes or reports.

Download the full dataset as JSON or CSV for use in your own projects.

How to use Periodic Table

Open Periodic Table in your browser. No signup, no install.

Type a name, symbol or number into Search elements to highlight matches instantly.

Use the Color by toggle to switch between Category, Phase and Block views.

Click any element cell to open its full property panel on the right.

Hit Copy element summary to copy all properties as plain text, or use Download JSON / CSV to export the complete dataset.

Frequently asked questions

Is Periodic Table free?

Yes, Periodic Table is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Periodic Table runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Periodic Table do?

It shows all 118 elements in a color-coded grid. You can search by name, symbol or atomic number, switch color modes by category, phase or block, click any element for its full properties, copy a summary or download the dataset as JSON or CSV.