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Change PDF Page Size
Change PDF Page Size — Free Online Tool
Turn every page into A3, A4, A5, Letter, Legal, or Tabloid — portrait or landscape.
About Change PDF Page Size
A US Letter document that has to print on A4, a mixed-size scan that should be one uniform size, a Legal page that needs to fit a normal tray — this tool sets every page in a PDF to the same sheet. Pick A3, A4, A5, Letter, Legal or Tabloid, pick portrait or landscape, and the panel draws the two sheets to scale against each other, prints page one's current size in points, and spells the target out in millimetres and inches. Orientation opens on whatever the document already has, so the default run reshapes the sheet without also turning it sideways. The Content control is the one that matters. Scale to fit, the default, enlarges or shrinks everything on the page by a single factor and centres it on the new sheet, so nothing is cut off and nothing changes shape — the panel prints the exact percentage for page one. It also draws only what the page was actually showing: marks that sat outside the visible area — bleed, printer's marks, whatever a crop box was keeping out of sight, including anything you just trimmed away with Crop PDF — stay hidden instead of being scaled onto the new sheet with everything else. Box only leaves the content precisely where it is and changes the page rectangle around it, drawn from the bottom-left corner of the page as you see it, which means a smaller sheet cuts into the page and a larger one adds blank space; that corner is the same one on a rotated page and on a page whose visible area does not start at the file's own origin. Both the media box and the crop box are rewritten, which is what makes the new size hold in every viewer rather than only in some, and a page carrying a rotation is measured the way you see it rather than the way it is stored. Annotations — links, comments and the boxes a form field draws — travel with the content under Scale to fit: they get the same scale and the same centring shift, so a link still covers the words it sat on and a field box still sits on its own label. That was measured by resizing a page whose link rectangle exactly covered a drawn button and reading both back out of the result: zero drift on ten different shapes, including landscape flips, a rotated page and a page whose media box does not start at the origin. Box only does not move the content, so it leaves annotations alone for the same reason. One limitation is left, and it is narrow. A field's stored appearance — the picture a viewer draws for it — is not rewritten, and neither is the font size recorded alongside it. Readers stretch the stored picture to the field's new size, so it normally looks right; but a reader that redraws the field from scratch, which is what happens the moment someone types into it again, lays the text out at the point size the file still names and it comes out too small for the enlarged box. A flat document with no links, comments or form fields is unaffected by any of this. Nothing is uploaded and no image is ever re-encoded.
Questions
What is the difference between Scale to fit and Box only?
Scale to fit, the default, enlarges or shrinks everything on the page by one uniform factor and centres it on the new sheet, so nothing is cut off and nothing is distorted. It also draws only what the page was already showing, so marks a crop box was hiding — bleed, printer's marks, anything you just trimmed off with Crop PDF — do not come back on the bigger sheet. Box only leaves the content exactly where it is and changes the page rectangle around it, drawn from the bottom-left corner of the page as you see it — so a smaller sheet cuts into the page and a larger one adds blank space. That corner is the same one on a rotated page and on a page whose visible area does not start at the file's own origin.
Will my form fields and annotations still line up?
Yes. Under Scale to fit, links, comments and form-field boxes get the same scale and the same centring shift as the content, so a link still covers the words it sat on and a field box still sits on its own label. That was checked by resizing a page whose link rectangle exactly covered a drawn button and measuring both in the output: no drift at all across ten shapes, including landscape flips, rotated pages and a page whose media box does not start at the origin. Box only does not move the content, so it does not move annotations either. One narrow limitation is left. A field's stored appearance — the picture a reader draws for it — keeps its original size, and so does the font size recorded with the field. Readers stretch that stored picture onto the field's new rectangle, so it normally looks right; but a reader that redraws the field instead, which is what happens as soon as someone types into it again, uses the point size the file still names and the text comes out too small for the enlarged box.
Can I enter a custom size in millimetres?
No. The tool offers six standard sizes — A3, A4, A5, Letter, Legal and Tabloid — each in portrait or landscape. The exact dimensions of the size you pick are shown in millimetres and inches next to the control, so you always know what you are getting.
Does it resize every page or only the ones that are the wrong size?
Every page in the document is set to the size you choose. That is the point of the tool for a mixed-size scan, but it does mean a file that deliberately mixes portrait and landscape pages comes out uniform.
What happens to pages that are rotated?
The size you pick is the size you will see. A page carrying a 90-degree rotation is measured and resized in the orientation it displays in, and its rotation is left alone — so a sideways page stays sideways at the new size rather than snapping upright.
Is my file uploaded to a server?
No. Transmute processes everything locally in your browser using JavaScript and WebAssembly. Your files never leave your device — there is no server, no upload, no cloud processing.