Resize any image by exact pixels — or pick a preset like A4 at 150/300 DPI, Full HD or 4K. Aspect-ratio lock included. All in your browser, nothing uploaded.
One image at a time
A4 presets use exact print math: 210×297 mm at 150/300 DPI.
The gold standard for sharp prints in Europe. A4 at 150 DPI (1240×1754) is fine for drafts and everyday documents.
Full HD covers most wallpapers, presentations and video thumbnails. 4K (3840×2160) for large displays.
1080×1080 square for feed posts, 1080×1920 vertical for stories and reels — both are one-click presets above.
Shrinking is always safe. Enlarging more than ~2x from the original gets blurry — start from your largest source file.
A4 (210 × 297 mm) at 300 DPI is 2480 × 3508 pixels. At 150 DPI it is 1240 × 1754 pixels. Both presets are built into the tool — one click sets the exact size.
Leave "Lock aspect ratio" checked (it is on by default). Then changing the width automatically updates the height so your image never looks stretched.
Making an image smaller is safe and looks crisp. Enlarging beyond the original size can look blurry because the browser has to invent pixels — for big prints, start from the largest original you have.
No. Resizing runs entirely in your browser using the canvas API. Your images never leave your device.