A PDF created for US Letter (8.5 × 11 in) needs to fit a European A4 printer (210 × 297 mm). A book PDF designed for A5 needs to scale to A4 for large-print accessibility. Print shops mandate specific page sizes for offset printing. PDFKits Resize PDF changes page dimensions to any standard size (A4, Letter, Legal, A3, A5, Tabloid) or custom dimensions, in your browser, free, with no upload.
The tool supports two modes: fit (scales content proportionally to fit the new page size, adding margins if needed) and stretch (resizes content to exactly fill the new dimensions, distorting if aspect ratios differ). Most users want fit mode. The original PDF is unchanged — a new resized copy downloads to your device.
Drop the file. PDFKits detects the current page dimensions and shows them in the panel.
Choose a preset (A4, Letter, Legal, A3, A5, Tabloid, B5) or enter custom dimensions in mm/inches. Pick orientation (portrait or landscape) if different from the original.
Select fit (proportional scaling, recommended for most cases) or stretch (exact dimensions, may distort). Click Resize. PDFKits scales each page via pdf-lib and downloads the resized PDF instantly.
A US-designed PDF (Letter) needs printing in Europe (A4). Resize first to avoid awkward margins or cropped content.
Standard documents are resized from A5 or Letter to A3 or Tabloid for visually impaired readers, with text and images scaling proportionally.
Offset print shops mandate specific page sizes. Designers resize a final PDF to match the press requirements before delivering files.
Long documents resized to a custom narrow page (e.g., 8 × 11 inches) read more comfortably on phones and tablets.
Most online PDF tools that resize charge per file or upload to remote servers. Adobe Acrobat handles it but costs $19.99/month. PDFKits Resize PDF runs entirely in your browser via pdf-lib. Free, no signup, no upload — supports all standard ISO and US paper sizes plus custom dimensions.
Fit mode (proportional) preserves quality. Stretch mode may distort images. For best results with mixed content, use fit mode.
Yes. PDFKits writes the new page size into the PDF dictionary so any printer reads the dimensions correctly.
The current tool applies one target size to the entire document. For mixed page sizes, split the PDF first via Split PDF, resize each piece separately, then merge.
Pick the target size with portrait orientation — the content rotates to fit.
Slightly. Larger output (Letter → A3) increases file size due to scaled images; smaller output (A3 → A4) reduces it.
Unlock it first using our Unlock PDF tool, then resize.