How to resize every pdf page to standard a4
- Step 1Open the resize tool and drop your PDF — Drag the file onto the PDF Resize drop zone. Free tier accepts files up to 2 MB and 50 pages; Pro raises this to 50 MB and 500 pages. The file is read into memory in your browser — nothing is uploaded.
- Step 2Click the A4 preset button — The tool shows three preset buttons — A4, Letter, Legal. Click A4 and it sets Width to
595and Height to842points. That is the exact A4 size (210 × 297 mm rounds to 595.3 × 841.9 pt). - Step 3Leave the width and height as the A4 values — The two numeric fields below the presets show Width (pt) and Height (pt). After clicking A4 they read 595 and 842. There is no millimetre or inch unit selector — the tool works in points only. Don't change them unless you want a non-A4 size.
- Step 4Run the resize — Process the file. The tool creates a new A4 page for each source page, scales the original content to fit proportionally, and centres it. Pages that aren't already 0.707:1 (A4's aspect ratio) get a white letterbox border on the long or short edge to preserve proportions.
- Step 5Check the page count and a sample page — The output reports the page count, which should match your input exactly — resize never adds or drops pages. Open the result and confirm the content sits centred with even white borders and nothing is clipped at the edges.
- Step 6Download the A4 PDF — Save the file and send it to print. If a page came out rotated relative to A4 portrait (e.g. a landscape source forced into portrait A4 with big top/bottom borders), rotate it first with PDF Rotate, then resize again.
What the A4 resize actually does
The exact behaviour of the resize engine when the target is A4. There is one scaling mode — proportional scale-to-fit with centring — not a choice between 'scale' and 'pad'.
| Source page | Result on an A4 (595 × 842 pt) page | White border added? |
|---|---|---|
| US Letter portrait (612 × 792 pt) | Scaled to ~97% so the full content fits A4's narrower width; sits centred | Thin border top and bottom (A4 is taller and narrower than Letter) |
| A4 portrait already (595 × 842 pt) | Scale factor is 1.0 — content reproduced at original size | None (already A4) |
| A3 portrait (842 × 1191 pt) | Scaled down to ~71% to fit; centred — content is half the physical area | Negligible (A3 shares A4's aspect ratio) |
| Landscape slide (720 × 540 pt) | Scaled to fit A4 portrait width, leaving large bands above and below | Large border top and bottom — rotate to landscape A4 first if undesired |
| Tall receipt / custom (300 × 1400 pt) | Scaled down to fit A4 height; narrow strip centred horizontally | Wide borders left and right |
A4 in the units the tool understands
The tool's fields are labelled 'pt' (PostScript points, 72 per inch). These are the equivalents — you only ever type the point value.
| Size | Points (what you enter) | Millimetres | Inches |
|---|---|---|---|
| A4 portrait | 595 × 842 (preset button) | 210 × 297 mm | 8.27 × 11.69 in |
| A4 landscape | 842 × 595 (type manually) | 297 × 210 mm | 11.69 × 8.27 in |
| US Letter (for comparison) | 612 × 792 (preset button) | 215.9 × 279.4 mm | 8.5 × 11 in |
Cookbook
Common A4 resize jobs and exactly what each produces.
Letter PDF from a US colleague to A4 for printing
The single most common A4 job. A Letter PDF prints with cut-off footers on a default-A4 printer. Click the A4 preset and the content is proportionally scaled to A4's narrower width.
Input: report.pdf, 12 pages, all 612 x 792 pt (US Letter)
Action: click 'A4' preset -> Width 595, Height 842
Output: 12 pages, all 595 x 842 pt (A4)
content scaled to ~0.97x, centred,
thin white band top + bottom
(Letter is wider/shorter than A4)Mixed-size scan normalised to A4
A scanned bundle where the feeder picked up a few short pages. Resize forces every page to A4 so the printer stops re-scaling page by page. For documents that are mostly mixed sizes, see the dedicated normalise guide linked in the FAQs.
Input: scan.pdf, 9 pages
p1-7: 595 x 842 (A4)
p8: 612 x 792 (a Letter sheet snuck in)
p9: 420 x 595 (an A5 insert)
Action: A4 preset
Output: 9 pages, all 595 x 842 pt
p8 lightly scaled, p9 enlarged ~1.4x, both centredLandscape slide deck into A4 portrait
Exporting slides to A4 portrait without rotating leaves each slide as a thin strip with huge top/bottom margins. The fix is to rotate first.
Input: slides.pdf, 20 pages at 720 x 540 pt (4:3 landscape)
Action (wrong): A4 portrait preset
Result: slide squeezed into top-third of an A4 page,
massive white band below -> looks broken
Action (right): PDF Rotate 90 deg first,
then resize to 842 x 595 (A4 landscape, typed)
Result: each slide fills an A4 landscape sheetConfirming the A4 point values are correct
If you're unsure whether 595 × 842 is right, this is the arithmetic. A4 is 210 × 297 mm; one point is 1/72 inch; one inch is 25.4 mm.
210 mm = 210 / 25.4 in = 8.2677 in = 8.2677 * 72 = 595.3 pt 297 mm = 297 / 25.4 in = 11.693 in = 11.693 * 72 = 841.9 pt The A4 preset rounds these to 595 x 842 pt. The sub-point rounding is invisible at print resolution.
A4 PDF that has form fields you need to keep
Resize rebuilds each page by embedding the original as a flattened graphic, so fillable fields and links do not survive. Resize the document only after the form is filled and flattened.
Input: application_form.pdf (Letter, with AcroForm fields)
Action: resize to A4 directly
Result: pages are A4, but the text inputs and checkboxes
are gone (flattened into the page image)
Better order:
1. fill the form in any PDF reader
2. PDF Flatten -> bakes answers into the page
3. resize to A4 -> safe, nothing left to loseEdge cases and what actually happens
Source page is landscape, A4 target is portrait
By designThe tool never rotates content — it only scales and centres. A landscape page forced onto A4 portrait is scaled to fit the narrow width, leaving large white bands above and below. This is correct behaviour, not a bug. Rotate the page to portrait with PDF Rotate first, or type the A4 landscape size 842 × 595 instead.
Form fields and checkboxes disappear after resizing
FlattenedResize creates fresh pages and embeds each original page as a graphic object (embedPages), which flattens interactive content. AcroForm fields, push buttons, and JavaScript actions are not carried over. Fill and flatten the form before resizing, or do the resize on the blank template before adding fields elsewhere.
Hyperlinks and bookmarks stop working
Not preservedLink annotations and the document outline live in page/document structures that the embed-into-new-page approach does not reproduce. After resizing, clickable links and the bookmark sidebar are gone. If link integrity matters more than exact A4 sizing, keep the original and adjust the printer's paper handling instead.
Free tier file is over 2 MB or 50 pages
Tier limitPDF tools on the free tier cap at 2 MB and 50 pages. A4 scans easily exceed 2 MB. Shrink the file first with PDF Compress (Aggressive) or PDF Compress (Lossless), or upgrade to Pro for 50 MB / 500 pages.
Content already extends to the page edge (full-bleed)
ExpectedIf the source content fills the whole page, proportional scaling to A4 will leave a thin white border on whichever pair of edges has the spare room, because the source and A4 aspect ratios rarely match exactly. There is no fill / crop-to-fit mode. For true edge-to-edge output add bleed in the authoring app before export.
Page is already exactly A4
No-op-ishA page that is already 595 × 842 pt gets a scale factor of 1.0 and is reproduced at original size with no border. The page is still rebuilt (re-embedded), so the byte layout changes slightly even though the visible result is identical.
Encrypted / password-protected PDF
HandledThe engine loads documents with ignoreEncryption: true, so a PDF with an owner password (restrictions but no open password) usually resizes fine. A PDF that needs a password just to open should be decrypted first with PDF Unlock.
Tiny target below the 72 pt minimum
RejectedThe Width and Height fields enforce a minimum of 72 pt (one inch). You cannot set A4 smaller than its real size here, and any custom size below 72 pt is clamped. For A4 this never applies — the concern is only relevant on the custom-size workflow.
Vector text scaled up looks crisp; scanned images soften
ExpectedEnlarging a sub-A4 page (e.g. A5 to A4) scales vector text and lines with no quality loss, but a scanned/raster page is interpolated and softens. If the source scan is below ~150 DPI for its target physical size, the enlargement will look fuzzy — there is no resolution to invent.
Output page count differs from input
Cannot happenResize is strictly one-page-in, one-page-out. The output always has the same number of pages as the input. If you wanted to also drop or reorder pages, do that with PDF Delete Pages or PDF Reorder before or after resizing.
Frequently asked questions
What exact dimensions does the A4 preset set?
595 × 842 points. That is A4 (210 × 297 mm) converted to PostScript points at 72 points per inch: 210 mm = 595.3 pt and 297 mm = 841.9 pt, rounded. The sub-point difference is invisible at any print resolution.
Can I enter the size in millimetres instead of points?
No. The Width and Height fields are points only — there is no mm or inch unit selector. For A4 just click the A4 preset button and it fills in 595 × 842 for you, so you never have to do the conversion.
Will scaling distort my content?
No. The tool scales by a single uniform factor (the smaller of the width and height ratios), so the aspect ratio is preserved. Content is never stretched in one direction. If the source isn't A4-proportioned, the difference shows up as a white border, not as distortion.
Is there a 'pad' mode versus a 'scale' mode?
No — there is one behaviour. The tool always scales the content to fit and centres it; the leftover space is automatically white padding. There is no separate option to pad without scaling or to scale-to-fill with cropping.
My PDF mixes A4 portrait and A4 landscape pages — will this fix orientation?
Resize standardises the page box to whatever size you type, but it never rotates content. A landscape page resized onto A4 portrait ends up small with wide top/bottom borders. Fix orientation first with PDF Rotate, then resize.
Does resizing affect embedded fonts or text quality?
Fonts stay embedded and text stays vector, so it renders crisply at any scale. Text in the output remains selectable provided it was real text (not a scanned image) in the source — but interactive form fields are a separate matter and are not preserved.
Can I resize only some pages to A4 and leave the rest?
No. This tool resizes every page in the document to the same target. There is no page-range option. If you need only a subset at A4, split those pages out with PDF Extract Pages, resize them, then recombine with PDF Merge.
Will it work for files going to a professional print shop?
Yes for general documents — print shops expect consistent A4 page boxes. But be aware: proportional scaling can move or shrink bleed and trim marks, and the tool adds no bleed of its own. For press work, set the final A4-plus-bleed size in your design app before exporting rather than resizing afterward.
How big a PDF can I resize?
Free tier: up to 2 MB and 50 pages. Pro: up to 50 MB and 500 pages. pro_media: up to 500 MB. If your A4 scan is over the limit, compress it first with PDF Compress (Aggressive).
Are my documents uploaded to a server?
No. Resizing runs in your browser via pdf-lib. The PDF bytes stay on your device; only an anonymous 'one file processed' counter is recorded server-side for dashboard stats, with no document content.
The resized A4 still won't print full-page — why?
Check the printer driver, not the PDF. Many drivers default to 'Fit to printable area', which re-scales an already-correct A4 page. In the print dialog choose 'Actual size' or '100%'. The PDF being exactly 595 × 842 pt is the half you control here.
What's the difference between this and cropping to A4?
Resize keeps all the content and changes the page box, scaling content to fit (with borders). Cropping with PDF Crop keeps the content at original scale and trims the visible area to a smaller box — content outside the box is hidden, not shrunk. Use resize to fit everything onto A4; use crop to chop margins.
Privacy first
All PDF processing runs locally in your browser using PDF-lib and pdf.js. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.