Pick from nine paper sizes
Page size lists A0, A1, A2, A3, A4, A5, A6, Letter and Legal. The tool opens on A4, so change the list before you run the job if you need another size.
Scale PDF pages to a paper size
or drop a file anywhere here
Dropbox
Google Drive
Files other than PDF are converted first. Signing in raises the size limit.
Or start from a blank IRS form
Browse all IRS forms →- You add
- One PDF
- You set
- A page size and a scale factor
- You get
- A PDF with resized pages
Scaling a PDF changes the size of its pages to a paper size you choose. A document laid out for A4 can be turned into Letter for a printer in North America, and a large A3 sheet can be brought down to A4. On this page you add one PDF, pick a size in the Page size list and, if you need it, change the Scale factor. The list holds A0 to A6, Letter and Legal, and it opens on A4. The size you pick is applied to every page of the file. You download a new PDF, while the copy on your device keeps its old page size.
What can you do when you scale PDF pages?
Resize the whole document at once
The size you choose is sent once and applies to all pages. A file that mixes page sizes comes back with one size from the first page to the last.
Adjust the scale factor
Scale factor is a number from 0.1 to 5 that moves in steps of 0.1 and starts at 1. It is sent with the page size as a multiplier for the PDF engine. Leave it at 1 unless a test run shows you need another value.
Catch a wrong number before the job starts
If you type a value under 0.1 or over 5, the field shows Minimum is 0.1 or Maximum is 5 and no job starts. Text that is not a number gets the note Enter a number.
What scaling keeps and what it changes
Stays the same
- Page count and page order.
- The proportions of each page's content. It is scaled evenly, never stretched.
- The file on your device. You download a scaled copy.
Changes
- Every page becomes the paper size you chose.
- Each original page is drawn onto the new page at the largest size that fits, then multiplied by the scale factor.
- The content is centered. When the shapes differ, empty bands appear on two sides.
- A scale factor above 1 enlarges the content past the fit, so its edges can fall outside the page.
- The result is built as a new document, so check links, bookmarks and form fields in it.
Which size and scale factor for which job
| You want to | Page size | Scale factor |
|---|---|---|
| Print an A4 document on US paper | LETTER | 1 |
| Print a US Letter document on A4 paper | A4 | 1 |
| Bring an A3 sheet down for a desktop printer | A4 | 1 |
| Leave a margin around the content | The size you need | Below 1, in steps of 0.1 |
| Fill the page more | The size you need | Above 1, but check that the edges stay inside |
How to scale PDF pages in 3 steps
Upload your PDF
Drag the PDF you want to resize onto the upload box, or press Choose file. Scaling runs on one document at a time.
Choose Page size and Scale factor
Open the Page size list and pick the paper you need, for example Letter. Keep Scale factor at 1, or type a number between 0.1 and 5.
Run Scale Pages and download
Press Run Scale Pages. When the result card says your PDF file is ready, press Download and open a few pages to check the fit.
Why scale PDF pages with indox?
Two fields decide the whole job, and both are on screen before you start: a paper size and a scale factor. The size list covers the ISO A series from A0 to A6 plus Letter and Legal, so one tool handles a switch in either direction between the two paper systems. The number you type is checked on the page, and a value outside the allowed range is flagged before the job starts. A single file runs without an account. Your PDF is sent over HTTPS, and the free tier deletes the upload and the resized copy automatically within 24 hours after the job finishes. This page also says where the tool stops: it resizes all pages to one listed size, with no custom dimensions, no orientation switch and no preview.
- Nine paper sizes in one list
- A scale factor from 0.1 to 5
- The same size on every page
- One file without an account
- HTTPS upload, deleted within 24 hours
What are the limits when you scale PDF pages?
- Size
- The free tier has a file size limit. Signing in raises it, and paid plans raise it further.
- Formats
- This tool works on PDF files. To change a file's type, use the PDF converter.
- Privacy
- Files are encrypted in transit and processed on indox infrastructure.
- Deletion
- Free-tier files are deleted automatically within 24 hours after the job finishes. Signed-in output stays in your history for your plan's retention period.
Limits worth knowing
- The list has nine fixed sizes. You cannot type custom dimensions, and no choice keeps the current page size while only the scale factor changes.
- Every page gets the same size. To resize part of a document, pull those pages out with Extract pages and scale that file.
- There is no orientation setting and no preview. If your file has landscape pages, open the download and check how they came out.
- Scale factor has no help text on the page. Run a short test file before you rely on a value other than 1.
- The form has no place for a password. Take an open password off with Unlock PDF before you resize the file.
When the result is not what you expected
| What you see | Why | What to do |
|---|---|---|
| Empty bands on the sides or at the top and bottom | The new size has a different shape from the old one, and the content is fitted without stretching | This is expected. Pick the size that matches the original shape, or crop afterwards with Crop PDF. |
| Content is cut off at the edge | A scale factor above 1 pushes it past the page | Run it again with a factor of 1 or less. |
| Landscape pages came out small | The size is applied in its portrait shape, and a wide page is fitted into it | The tool has no orientation setting, so expect that. Turn the result with Rotate PDF if you need landscape sheets. |
| Links or bookmarks stopped working | The result is built as a new document from drawn pages | Check them in the result. Rebuild bookmarks with Edit TOC. |
| The file asks for a password | The page has no field for one | Remove it with Unlock PDF, then resize the open copy. |
What do the free and paid plans add?
Free
- All converters
- Daily credit refresh
- Email support
Basic
- Access to all features
- AI Extract
- Priority conversions
- Email support
Highest priority
Premium
- Everything in Basic
- Highest priority queue
- Larger file limits
- Priority support
Pay-As-You-Go
- No subscription
- Credits never expire
- Opt-in auto-refill
- Access to all features
What else can you do with a PDF?
Who scales PDF pages?
People printing a document from another region
A PDF made for A4 goes to a printer loaded with Letter, or the other way round. Resize it first so the page matches the paper in the tray.
Students and office staff making handouts
A large A3 poster or spreadsheet export has to fit an A4 handout. Pick A4 and run the job on the whole file.
Anyone tidying a mixed scan
Receipts, letters and forms scanned together often end up as pages of different sizes. One run puts them all on the same paper size.
When to scale pages, and when to pick another tool
- A print shop or office printer expects Letter and your file is A4.
- An A3 drawing has to go into an A4 binder.
- A scan mixes page sizes and should look uniform before you send it.
- A small A5 leaflet has to be enlarged to A4 for a notice board.
- You only want to cut off margins. Crop PDF trims the edges and leaves the remaining content at its size.
Where can I read more?
Sources
- ScalePagesController source, v2.14.2Stirling-PDF on GitHub
- Stirling-PDF documentationStirling-PDF
Facts checked on October 16, 2026
Do it all with indox
No tool matches that search.
Scale Pages FAQs
How do I change a PDF from A4 to Letter?
Choose Letter in the Page size list, leave Scale factor at 1 and press Run Scale Pages. The pages in the download measure 612 by 792 points, which is 8.5 by 11 inches.
Which page sizes can I choose?
A0, A1, A2, A3, A4, A5, A6, Letter and Legal. A4 is selected when the page opens.
What does the scale factor do?
It is a multiplier that the tool sends to the PDF engine along with the page size. It starts at 1 and accepts 0.1 to 5. The page does not explain it further, so test another value on a short file first.
Can I enter a custom width and height?
No. The tool offers the nine listed paper sizes and has no field for your own dimensions.
Can I resize only some pages?
No, the size applies to all pages. Use Extract pages to pull out the ones you need, then scale the extract.
Can I keep the page size and only scale the content?
Not on this page. Every entry in the Page size list sets a paper size, and there is no keep-current option.
What happens if I leave Scale factor empty?
The field is optional. An empty field is not sent, and the job runs with a factor of 1.
Do I need an account, and how long are files kept?
One file runs without an account. The transfer uses HTTPS, and on the free tier both the PDF you add and the scaled result are deleted automatically within 24 hours after the job finishes.