Resize Canvas Size - Free Online Browser Tool

Standardize page dimensions to A4, US Letter, or US Legal with auto-fit.

Mixed page sizes are the classic reason a printer rejects a file or prints it with wide white bands down one side. This tool moves every page onto one standard sheet — A4, US Letter or US Legal — scaling and centring the content so nothing is cropped.

This resize canvas size utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

Common next steps: 16:9 Presentation Framing, Crop PDF Margins, Scale Content.

How to Use the Resize Canvas Size Tool

Four steps, and the whole thing runs locally on your own device.

  1. Load the PDF

    Drop in the document with mixed or wrong page sizes.

  2. Pick the target size

    Choose A4, US Letter or US Legal. A4 suits most of the world; Letter suits North America.

  3. Choose the fit behaviour

    Auto-fit scales each page proportionally to the largest size that fits, preserving its aspect ratio so nothing is stretched or cut.

  4. Resize and download

    Press Resize Canvas to write every page at the chosen standard size.

Frequently Asked Questions

Will my content get cut off to fit the new size?

No. Auto-fit scales down proportionally and centres, so the entire original page remains visible — letterboxed where the aspect ratios differ.

Is A4 or Letter the right choice for me?

A4 is 210 × 297 mm and standard in Europe, Asia and most of the world. Letter is 8.5 × 11 inches and standard in North America. Match the paper you actually print on.

Does this differ from Standardize Page Sizes?

This tool sets every page to a fixed standard size of your choice. Standardize Page Sizes instead adopts one of the document’s own existing page sizes as the reference.

Will the rescaling make text blurry?

No. Vector content is transformed, not re-rendered, so text stays sharp and selectable. Photographic images are scaled to fit the new canvas without cropping.

Can I choose Legal size?

Yes, US Legal is available alongside A4 and US Letter for long, narrow legal documents.