Resize PDF

Free

Resize every page to Letter / Legal / A4 / A3 / A5. Content scales to fit, aspect ratio preserved.

What you'll get: a PDF resized to Letter, Legal, A4, A3, or A5 — content scales to fit while preserving aspect ratio. Optional landscape orientation. For another use, try Crop PDF.

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Stays in your browser

Free tools run fully on-device — nothing is uploaded to a server.

No watermarks

Clean output, no branding, no daily limits.

Free forever

No signup required. Seriously.

Why people resize PDFs

Standardizing page size is a frequent prep step. Submission portals expect Letter or A4. Print shops want consistent sheet sizes. International teams need to convert between US and metric paper.

US ↔ metric conversion

Convert Letter (US) to A4 (international) so the doc opens cleanly anywhere — or vice versa.

Print-shop standardization

Print shops batch jobs by sheet size. Resize all pages to one target before submitting.

Submission portals

Many gov / academic portals reject PDFs with non-standard page sizes. Resize to the required size first.

Cross-doc consistency

When merging PDFs from multiple sources, resizing to a common size makes the merged result look uniform.

Mobile-friendly resize

Down-resize a Legal PDF to A5 for tighter mobile display.

Pre-archiving normalization

Archives often require uniform page size. Resize before depositing into long-term storage.

How Resize PDF works

Three steps, no signup, no uploads.

STEP 1
Drop your PDF
Up to 100 MB. pdf-lib loads it in your browser.
STEP 2
Pick target size + orientation
Letter, Legal, A4, A3, or A5. Optional landscape toggle. We compute the largest scale that keeps the source within the target.
STEP 3
Apply & download
Each source page is embedded and drawn on a new target-sized page, centered, with margins where the aspect ratios differ.

What makes pdfcraft ai different

Same engine Chrome uses
PDFium is Google's PDF engine — the one that powers Chrome's built-in PDF viewer. We compile it to WebAssembly so it runs in your browser at near-native speed.
100% local processing
Most free PDF tools upload your file to a server, process it, and stream the result back. We don't. Your file lives in your browser tab and never touches our infrastructure. Verifiable in your browser's Network panel.
No watermark, no signup, no daily limit
Convert 1 PDF or 1,000. We don't gate on volume because there's nothing to gate on — the engine runs on your machine.
Honest about limitations
When something the tool can't do (encrypted PDFs, cross-reference streams), we tell you clearly instead of failing silently. Same for partial results: sampled vs exact, embedded vs not.
Open standards, free engines
PDFium is BSD/Apache licensed (free for any use). We don't pay vendor license fees and pass that savings on to you (and to ourselves) as a free, ad-supported tool with no upgrade-to-pro pressure.

Frequently asked questions

Does this preserve content quality?

Yes. Embedding-and-drawing is a reference operation — the source content stream is preserved, just placed on a larger or smaller stage. No rasterization, no quality loss.

Why are there margins around the content?

Aspect-ratio mismatch. A 3:4 source on a 4:3 target leaves margins on the sides. We center the content; the margins are filled with white.

Can I resize to custom dimensions?

Not in v1 — 5 standard sizes cover the vast majority of needs. Custom is a future extension.

Will resizing change file size?

Roughly the same. Resource reuse via embedPdf keeps overhead minimal.

Is anything uploaded?

No. pdf-lib runs in your browser.

Just want to crop instead?

Crop PDF removes content margins without scaling. Different operation — useful when the page is the right size but the content area is too wide.

Try Crop PDF

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