English Lemmatizer & Porter Stemmer

The English Lemmatizer & Porter Stemmer is a free online tool that reduce english words to their base forms with the porter stemmer algorithm or a rule-based lemmatizer. compare both side by side.. It runs entirely in your browser with no installation or sign-up needed.

Stemming chops off word endings heuristically (running->run, studies->studi) — stems may not be real words. Lemmatization returns the dictionary base form (studies->study, went->go) — lemmas always are.

Classic Porter stemmer (Porter 1980) implemented in your browser — all 5 steps including m>0/m>1 measure conditions, *v*, *o, and *d tests.

No. All stemming, lemmatization, and export happen entirely in your browser. Your text never leaves your device.

Yes, the English Lemmatizer & Porter Stemmer is 100% free with no registration, no hidden fees, and no usage limits. All processing happens locally in your browser, ensuring complete privacy.

Absolutely. The English Lemmatizer & Porter Stemmer processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the English Lemmatizer & Porter Stemmer is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the English Lemmatizer & Porter Stemmer in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Yes, the English Lemmatizer & Porter Stemmer handles text of any length with fast, real-time processing. Since everything runs in your browser, performance depends on your device but works well for most use cases.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.