Resize PDF Pages
Resize PDF pages to A4, Letter, Legal, or custom dimensions without losing quality. Free, no signup.
About PDF Page Resize
PDF Page Resize changes the page dimensions of every page in a PDF to a new standard paper size (A4, Letter, Legal, A3, A5, B4, B5) or a custom width × height in millimeters or points — using PDF-lib's MediaBox rewriting engine, entirely in your browser. You can scale content to fit the new page size (proportional scaling), pad with white margins (letterbox), or crop to fit (center-crop). This is the correct tool when you need to standardize a mixed-page-size PDF into a uniform size for printing, binding, or submission. A common scenario: a PDF exported from a US Windows machine uses Letter (8.5" × 11") while the European recipient's printer expects A4 (210mm × 297mm). Another: a legal filing system requires all documents in Letter format but the submitted PDF is A3. This tool handles both conversions without re-authoring the document from scratch.
Most "resize PDF" tools only change the MediaBox dimensions without scaling the content — the result looks like the same content on a larger or smaller white canvas, not properly scaled. This tool offers three content-handling modes: Scale to Fit (proportionally scales all content to fill the new page), Letterbox (scales with equal white margins on all sides), and Crop (uses the center of the content at 1:1 scale). Scale to Fit mode applies a PDF transformation matrix to the page content stream, scaling vector text, images, and graphics uniformly.
How We Compare
Compared to desktop alternatives like Adobe Acrobat Pro (starting at $19.99/month), Smallpdf ($12/month for unlimited), or iLovePDF ($9/month Premium), PDF AI Tools delivers comparable quality at $0 for the core feature set. We skip the subscription friction by processing most operations directly in your browser with WebAssembly — no server infrastructure costs to pass on to users. Our AI features (summarization, chat, OCR) use a pay-as-you-go backend that keeps your total cost well under $5/month even for power users.
How to Use Resize PDF Pages
- Step 1: Upload your PDF — the current page dimensions and size are displayed (e.g. "8.5 × 11 in / Letter")
- Step 2: Choose a target size from the preset list (A4, Letter, etc.) or enter custom dimensions
- Step 3: Select content handling: Scale to Fit, Letterbox, or Crop to Fit
- Step 4: Toggle portrait/landscape if the orientation needs to change
- Step 5: Click Resize Pages — PDF-lib updates MediaBox dimensions and applies the content transformation matrix
- Step 6: Download the resized PDF
Why Choose PDF AI Tools
We've built PDF AI Tools to replace expensive desktop software like Adobe Acrobat for 95% of common document workflows — at zero cost to you. Unlike competitors who gate features behind paywalls, add watermarks, or limit file sizes, our tools are genuinely free and genuinely unlimited. Your privacy matters: files processed client-side in your browser never touch our servers, and even AI-powered features use encrypted, auto-deleting processing pipelines.
Key Features
- Standard size presets: A4, Letter, Legal, A3, A5, A6, B4, B5, Executive, Tabloid — one click to select
- Custom dimensions — enter width × height in millimeters, inches, or points
- Portrait/landscape toggle — swap width and height with one click
- Three content modes: Scale to Fit, Letterbox (maintain aspect ratio with margins), Crop to Fit
- Uniform resize — applies the same target dimensions to every page in the document
- Preserves fonts, images, annotations, form fields, and bookmarks throughout scaling
- Before/after size indicator — shows original vs target dimensions and the scale factor applied
- Client-side PDF-lib processing — no upload, no server, files up to 100 MB
Frequently Asked Questions
What is the difference between resizing a PDF page and printing a PDF at a different paper size?
Printing at a different paper size scales the content at print time but the PDF file remains its original size. Resizing with this tool permanently changes the PDF page dimensions so the file itself reflects the new size — opening it in any viewer shows the new dimensions. This is required when the file will be embedded in another document or submitted to a system that validates page size.
Will text become blurry when I scale a PDF?
No. PDF text is vector-based — it scales using mathematical transformation matrices, not pixel resampling. Text remains perfectly sharp at any scale factor. Raster images embedded in the PDF are also scaled using PDF transformation operators, not upsampled, so there is no quality loss for vector content; high-DPI images scale cleanly.
What is Letterbox mode?
Letterbox mode scales the content proportionally until it fits within the new page dimensions while maintaining aspect ratio. White space (margin) is added on the shorter sides to fill the page. This is the safest mode when you must preserve the exact proportions of the original layout.
Can I resize just specific pages rather than all pages?
Currently this tool applies the target size to all pages uniformly. To resize a subset of pages, use the Extract PDF Pages tool to split the document, resize the extracted section, and then use the Merge PDF tool to reassemble.
Does the tool support non-standard custom page sizes?
Yes. Enter any width and height in millimeters (e.g. 86mm × 54mm for a business card, 594mm × 841mm for A1 poster). The minimum dimension is 10mm; there is no maximum beyond browser memory limits.