Free · No signup · Runs in your browser
Free GHS Tools & Software
Build compliant labels, pick the right pictograms by jurisdiction, and run the classification calculators — free GHS software backed by a database of 4,000+ substances with harmonised CLP classifications.
01 · Tools
Interactive tools
Segregation
Chemical Storage Compatibility
Check which chemicals can be stored together. Enter a substance or pick hazard classes to get GHS segregation verdicts — never-store, keep-separate and compatible — with ADR transport data and predicted reaction gases.
Check Compatibility →Most popular
GHS Label Maker
Build print-ready GHS labels sized to your actual container per CLP Annex I — auto-filled pictograms, signal word and H/P statements for 4,000+ substances, your logo, PDF/SVG export. Free, no signup.
Build a Label →Acute toxicity
ATE Mixture Calculator
Classify a chemical mixture for acute toxicity under GHS/CLP. Auto-fills each ingredient ATE from harmonised Annex VI data (Table 3.1.2), runs the additivity formula across oral, dermal and inhalation routes, applies the 10% unknown rule and returns category, H-statements, pictogram and a printable report.
Classify a Mixture →Mixture classification
CLP Mixture Classifier
Classify a whole mixture under EU CLP and get the hazard classes for SDS Section 2. Pulls each ingredient’s harmonised Annex VI classification, applies specific and generic concentration limits, and prints the rule behind every line — quoted from the regulation, with the contribution of each ingredient and an honest “not computed” for every class it has not evaluated.
Open the classifier →Jurisdiction-aware
GHS Pictogram Selector
Pick hazard classes and categories to get the correct label pictograms, signal word and hazard statements for UN GHS, EU CLP, GB CLP and OSHA HazCom — with CLP Article 26 precedence applied and explained.
Open the Selector →Transport
UN Number Reference
Every UN number in Table A of ADR 2025 with proper shipping name, class and packing group. 389 numbers carry a full page with the 49 CFR 172.101 entry beside the ADR one — never merged — plus the orange plate and the CLP label elements of the substances that ship under it.
Open the reference →02 · Calculators
GHS classification calculators
Nine boundary-tested calculators — one per hazard pictogram. Each lives on its pictogram page alongside the hazard explanation, the official SVG download and the full substance list.
Explosive screening (waiver check)
The GHS screening step for explosives ahead of UN testing.
GHS02Flash point → GHS category
Classify a flammable liquid from its closed-cup flash point.
GHS03Oxidizer screening (waiver check)
The GHS screening step for oxidizers ahead of UN testing.
GHS04Critical temperature → gas group
Assign the gas-under-pressure group from critical temperature.
GHS05pH → corrosion trigger
Check whether extreme pH triggers skin/eye corrosion classification.
GHS06LD50 / LC50 → acute toxicity category
Assign the acute toxicity category from LD50 or LC50 values.
GHS07LLNA EC3 → skin-sensitiser sub-category
Assign skin-sensitisation sub-category 1A or 1B from LLNA EC3.
GHS08Viscosity → aspiration hazard
Check aspiration hazard for hydrocarbons from kinematic viscosity.
GHS09Aquatic L(E)C50 → environmental class
Classify aquatic hazard from the lowest acute L(E)C50 / EC50.
Why free, browser-based GHS tools?
Most GHS labeling software is desktop-based and licensed per seat. These tools cover the everyday tasks — checking a classification boundary, picking pictograms for a jurisdiction, printing a correctly sized label — directly in the browser, using harmonised classifications from CLP Annex VI. Need the data for one specific chemical? Our SDS library has substance-level reference pages with classification, storage verdicts and transport data. For managing a full SDS library, authoring Safety Data Sheets or running a chemical register, see our SDS compliance guides.