Described is a packaging line (1) for products in bags comprising: a feed unit (11), configured to receive a web to from a reel (12A) and for moving it along a feed path (P); a control unit (10), connected to the feed unit (11) for moving the web intermittently; a folding station (13), configured for folding the web about a folding line (131); a sealing station (14), configured for sealing the first and second flap of the web folded along sealing lines (14A); a cutting station (15), configured for cutting the packaging web and defining a plurality of packaging bags; a filling station (16), configured for filling with a product the plurality of packaging bags; a sealing station, configured for sealing the plurality of packaging bags. The feed unit (11) includes a first motor-driven roller (11A), for moving the web through the folding (13) and sealing (14) stations, by a first succession of forward movements (S1) with a first feed step, and a second motor-driven roller (11B), for moving the web by a second succession of forward movements (S2), with a second feed step. The line includes an adjustment unit (18), positioned between the first (11A) and the second (11B) motor-driven roller. The adjustment unit includes a tensioning element (181), operatively in contact with the web and movable between a first operating position (P1) and a second operating position (P2), and an actuator (182), connected to the tensioning element (181) for varying a position of the tensioning element (181), so as to vary the length of the feed path (P).
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