Convert paper sizes — A4, Letter, Legal — with millimeter and inch dimensions. Fit US Letter content onto A4 correctly — free, local, no signup.
Content reviewed October 2026 · About Toolzum
Convert ring sizes across US, UK, EU, and Japanese standards with millimeter diameters. Buy a size 7 as EU 54 correctly — free, local, no signup.
Convert shoe sizes across US, UK, EU, and CM Mondopoint with foot-length mapping. Translate EU 42 to US 9 accurately — free, local, no signup.
Convert between kW, hp, bhp, W, MW, and BTU/hr — engine specs, solar sizing, and HVAC math in one place. Size solar arrays and compare engine outputs correctly — free, local, no signup.
Convert screen sizes between inches, cm, resolution, and aspect — compare displays honestly. Check a 27-inch 4K pixel density — free, local, no signup.
Resize hundreds of photos to one exact W×H canvas (default 800×800, inputs 1–10000px) with Contain, Cover, or Stretch fit — no percentage or preset modes. Transparency flattens onto white; output is always PNG. Photographers deliver 400 wedding shots at uniform size — local Canvas work, 2 free batches a day.
A4 is 210×297 mm; Letter is 8.5×11 in (216×279 mm) — Letter is wider and shorter. Content reflows slightly between them.
Scale-to-fit preserves content with small margins; exact-size crops edges. Choose fit for reading, exact for forms.
No — math runs locally in your browser. Nothing leaves your device.