Resize PDF Pages Online, Free
Change PDF page dimensions to A4, Letter, A3, or any custom size. Content scales proportionally. 100% in your browser — no uploads.
Loading PDF resizer…
How to Resize a PDF
- Drop your PDF files — Drag and drop or click to select one or more PDF documents.
- Choose your target page size — Select a standard size (A4, Letter, A3, etc.) or enter custom dimensions in millimetres. Pick portrait or landscape orientation.
- Download instantly — Click “Resize” and download your resized PDFs individually or as a ZIP.
Why Resize PDF Pages?
PDF documents are created in specific page sizes, but you often need them in a different format. Resizing PDF pages helps you:
- Print on different paper sizes — Convert US Letter documents to A4 for European printers, or vice versa. Avoid awkward margins and cropped content.
- Standardise document sets — When merging PDFs from different sources, resize all pages to a uniform size for a professional, consistent result.
- Prepare for binding or framing — Resize to exact custom dimensions for booklets, portfolios, or presentation materials.
- Optimise for screen viewing — Resize wide-format PDFs to standard screen-friendly dimensions for easier reading on tablets and laptops.
Supported Page Sizes
Our PDF resizer supports all standard page sizes plus fully custom dimensions:
- A3 — 297 × 420 mm (11.7 × 16.5 in)
- A4 — 210 × 297 mm (8.3 × 11.7 in) — the most common international paper size
- A5 — 148 × 210 mm (5.8 × 8.3 in) — ideal for booklets
- US Letter — 216 × 279 mm (8.5 × 11 in) — the US standard
- US Legal — 216 × 356 mm (8.5 × 14 in)
- Tabloid — 279 × 432 mm (11 × 17 in)
- Custom — enter any width and height in millimetres
Need to resize images instead? Try our image resizer for JPG, PNG, and WebP files, or our video resizer for MP4 and other video formats.
Other Resizer Tools
Frequently Asked Questions
- Does resizing a PDF change its content?
- No. Resizing changes the page dimensions and scales the content proportionally to fit the new size. All text, images, and formatting are preserved — they're simply scaled to match the new page dimensions.
- Can I resize a PDF from Letter to A4?
- Yes. Select A4 as the target size and the content from your Letter-sized PDF will be proportionally scaled to fit A4 dimensions. This is one of the most common PDF resize operations.
- Is it safe to resize PDFs online?
- With HelloResizer, your PDF files never leave your device. Everything is processed in your browser using pdf-lib — no server uploads, no data collection. Your documents stay completely private.
- Can I resize multiple PDFs at once?
- Yes. Drop multiple PDF files and resize them all to the same target dimensions in one batch. Download individually or as a ZIP.
- What page sizes are supported?
- Standard sizes: A3, A4, A5, US Letter, US Legal, and Tabloid. You can also enter custom dimensions in millimetres for any size you need.
- Will resizing reduce the PDF file size?
- It depends. Resizing to smaller page dimensions may slightly reduce file size, but the primary purpose is changing page dimensions, not compression. The content (fonts, images) is preserved.