Every page of a PDF is resized using the same setting in one pass by the Resize PDF tool — there is no option to assign a different size to a single page, but documents with mixed page sizes are handled correctly because every page is measured and scaled individually to the chosen target. When you pick a Standard size such as A4, US Letter, or US Legal and choose portrait or landscape, the tool walks through every page in the document, reads its current width and height, computes the scale factor needed to bring that single page onto the chosen target, applies it, and recenters the content. A document that starts out as a mix of slide-deck pages at 1280 by 720 points, scanned pages at odd widths, and a poster page on a huge canvas therefore comes out uniform — every page lands on the exact same physical dimensions. In Percentage mode the logic is different: each page is scaled by the factor you enter relative to its own current size, so a small page and a large page both grow or shrink by the same percentage rather than ending up identical. Understanding this distinction — uniform output in Standard mode, proportional output in Percentage mode — prevents confusion when the resulting file looks different from what a per-page workflow would have produced. For most everyday mixed-size problems the right question is not "can I resize pages individually" but "will this normalize a heterogeneous input," and the answer to the second question is yes, by design.
How Standard Size Mode Normalizes Mixed Page Dimensions
Standard size mode is the simplest answer to mixed-page documents. When you pick a target, the tool walks through every page in the document, reads its current width and height, and computes the scale factor needed to bring that single page onto the chosen target. The result is a uniform document where page 1 from a slide deck, page 4 from a phone scan, and page 9 from a poster all end up on identical physical dimensions. The tool measures each page individually rather than copying the first page's geometry and applying it everywhere, which is what makes this approach work for uneven inputs. After scaling, the content is recentered on the new page so the artwork does not drift to one corner.
The three supported Standard targets are defined in PDF points, where 72 points equal one inch:
| Size | Width × Height (points) | Common use |
|---|---|---|
| A4 | 595 × 842 | International, ISO 216 standard |
| US Letter | 612 × 792 | North America office default |
| US Legal | 612 × 1008 | North America legal and contract documents |
How Percentage Mode Handles Pages of Different Sizes
Percentage mode changes the relationship between pages. Instead of measuring every page and forcing it onto one target size, percentage mode applies a single multiplicative factor to each page relative to its own current size. If you enter 50 percent, a page that started at 600 by 800 points becomes 300 by 400 points, and a page that started at 1200 by 1600 points becomes 600 by 800. The relative size differences between a small page and a large page are preserved because every page gets the same percentage treatment rather than a shared absolute target. A mixed-size document does not become uniform in percentage mode; the output keeps the same proportions between pages as the input. This is the right mode when the goal is to shrink everything for a preview, enlarge everything for projection, or apply a uniform scaling factor across a document where you already trust the relative proportions of the pages. The implementation calls page.scale(p, p) where p is the percentage divided by 100, so 200 percent doubles each dimension, 50 percent halves it, and any value in between works the same way.
Resizing a Mixed-Size PDF Step by Step
- Open the Resize PDF tool in your browser and click Browse PDF, or drag the file onto the page — the file is read into memory locally, nothing is uploaded.
- Switch to Standard size mode and pick A4, US Letter, or US Legal, then choose portrait or landscape orientation.
- Decide between Fit, which preserves original proportions with even margins where aspect ratios differ, or Stretch, which fills the target page edge to edge by scaling width and height independently.
- Click Resize PDF and wait for processing to finish — every page is measured and scaled individually in one pass.
- Download the resized file from the result link that appears below the controls.
Even though the tool cannot apply different settings to individual pages inside a single run, the practical workaround for the rare case where a per-page outcome is genuinely required is to split the document into pieces first with the Split PDF tool, resize each piece with its own setting, and recombine with the Merge PDF tool. For most mixed-size documents, the single-pass approach produces exactly the uniform output that printing, submission, and binding workflows require.
Fit vs Stretch with Mixed-Size Content
Fit and Stretch behave differently when the input contains pages of varying aspect ratios. Fit computes a single scale factor from the smaller of width or height, then centers the content on the target page, which adds even margins where the aspect ratios differ. Stretch scales width and height independently so the content fills the entire target page edge to edge. The choice matters most for mixed-size documents because the variety of input aspect ratios is what creates visible margins in Fit mode and distortion in Stretch mode.
| Mode | Behavior | Best for | Risk with mixed sizes |
|---|---|---|---|
| Fit | Scales by a single factor, centers with even margins | Faithful reproduction of varied aspect ratios | Adds margins on pages whose aspect ratio differs from the target |
| Stretch | Scales width and height independently, fills target | Filling a frame exactly, posters and covers | Distorts pages whose original aspect ratio differs from the target |
What the Tool Will Not Change: Per-Page Size Selection
The honest answer is that the Resize PDF tool does not let you assign a different target size to individual pages within the same run. Every page receives the same Standard size and Fit or Stretch choice, or the same percentage value. If a document genuinely needs page 1 to stay as A4 portrait, page 2 to become US Letter landscape, and page 3 to be 200 percent of its original, that requires splitting the document first, resizing each piece, then recombining — a workable but multi-step workflow rather than a single click. The verified product FAQ confirms this design: the tool applies one setting across the entire document in one pass, and that uniformity is the feature rather than a limitation. For users asking about mixed-size handling, the practical question is not whether they can resize pages individually but whether the tool can normalize a heterogeneous input into a consistent output — which it does, by design.
Rotated Pages, Scans, and Other Edge Cases
Resizing uses each page's unrotated orientation, which matters for phone captures and many scanner outputs. PDF pages carry a rotation flag that the viewing application applies at display time, and the Resize PDF tool preserves that flag on top of the new size. The result is correct geometry on the page object but content that still appears turned in the viewer until the rotation flag is reset. If a scan was captured sideways and the original PDF marked it as rotated, a portrait target will show that page sideways after resizing. The tool reports when it detects a rotated page, and the fix is to reset the rotation before resizing — typically with the Rotate PDF tool. Scanned pages that contain only a raster image with no live text are resized correctly because the image is scaled along with the page geometry. Password-protected or corrupted PDFs cannot be read without their password and are reported clearly so they can be unlocked first.
When Resizing Is Not the Right Job
Resizing changes page geometry — the physical dimensions measured in PDF points — and scales the drawn content to match. It does not re-sample images, strip fonts, or discard objects, so the number of bytes in the downloaded file can be similar to, and in some cases larger than, the original. If the real goal is a smaller file on disk for emailing or uploading, that requires image down-sampling and object optimization, which is a different task than resizing the page. Resizing fits the workflow when consistent paper dimensions are needed for printing, binding, or a submission requirement that specifies A4, US Letter, or US Legal. Privacy is built in throughout: the PDF never leaves the device, the file is read into memory and processed locally with JavaScript, and the original is left untouched when the new file is offered as a download link.
Related reading: Split PDF by Size: A Reddit-Style Local Method.
Related reading: Can I Resize a PDF in My Browser? Yes — Here's How.