sämtlich
all
A more formal and more emphatic variant of 'alle' (all); every single one of a named group without exception.
Sämtliche Unterlagen müssen bis zum Ende der Woche eingereicht werden.
All documents must be submitted by the end of the week.

all
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all
A more formal and more emphatic variant of 'alle' (all); every single one of a named group without exception.
Sämtliche Unterlagen müssen bis zum Ende der Woche eingereicht werden.
All documents must be submitted by the end of the week.

The word 'sämtlich' (all) is related to 'sammeln' (to collect) and 'gesamt' (entire/total). It expresses that a complete, “collected” set is meant, without exception.
Sämtliche Einnahmen des Konzerts werden für einen guten Zweck gespendet.
All proceeds from the concert will be donated to a good cause.
'Sämtlich' (all) belongs to formal written language. You often find it in official documents, contracts, official instructions, or academic texts.
Sämtliche Mitarbeiter sind dazu angehalten, die neuen Sicherheitsregeln zu befolgen.
All employees are instructed to follow the new safety rules.
'Sämtlich' (all) stands as an adjective before a noun and is declined. It is used almost exclusively with plural nouns.
Die Feuerwehr konnte sämtliche Bewohner aus dem brennenden Haus retten.
The fire department was able to rescue all residents from the burning house.
all
'all' and 'sämtlich' both mean that every person or thing in a group is included. 'all' is the normal, everyday word and fits almost everywhere. 'sämtlich' sounds more formal and more strongly emphasized. You are more likely to find it in written notices, rules, or official sentences. In conversation, people usually say 'alle'. 'Sämtliche Unterlagen' (all documents) sounds more precise and more official than 'alle Unterlagen' (all documents).

Wir müssen sämtliche Aufgaben bis Montag abgeben.
We have to submit all the assignments by Monday.
Vor der Reise prüft er alle Fenster in der Wohnung.
Before the trip, he checks all the windows in the apartment.