One size rule for every file: exact width × height, a long-edge cap, width or height only, a percentage or a print size in cm or inches. Smaller pictures are never enlarged unless you say so.
Choosing the rule
Long edge is the rule for a mixed folder: every photo ends at, say, 1600 pixels on its longer side, portrait or landscape. Width only and height only fix one side and let the other follow. Scale takes the same percentage off everything. Exact writes every file at one pixel box, and Print turns a physical size into pixels — 10 × 15 cm at 300 dpi is 1181 × 1772 — and writes the DPI label too.
The panel prints the result for the selected photo before anything is written (4032 × 3024 → 1080 × 810), and the queue card prints the real figure afterwards.
Step by step
- Drop one JPG or a whole folder. Other formats work too and come out as JPG.
- In Size, pick the rule — Exact, Long edge, Width, Height, Scale or Print — and type the number.
- Choose Fill, Fit or Stretch for an exact box; switch on Enlarge only if small files must grow.
- Press Download. Each card shows the size it was written at and the bytes either side.
Presets, and where their numbers come from
Instagram: up to 1080 pixels wide, as Instagram's Help Centre states. WhatsApp profile: a square crop — WhatsApp publishes no pixel size, so 640 × 640 is labelled a crop helper, not a rule. Email-friendly: long edge 1600 at Standard quality. Slides: 1920 × 1080 with the whole photo fitted and padded.

