# PDF page size converter > Browser-only file conversion. Selected files are processed on this device and are not uploaded to a conversion server. Source: https://localconverter.tech/pdf-page-size Fit PDF pages onto A4, Letter or a custom page with adjustable margins. A4 and Letter presets set actual page dimensions. Custom dimensions and margins are measured in PDF points, with 72 points per inch. Choose the supported original file using the file picker or drop zone. Check the accepted input types listed above the workspace. ## Useful tasks - Fit PDF pages to A4 or US Letter. - Choose custom page dimensions in PDF points. - Prepare a new page size and review margins before printing. ## Steps 1. **Provide the source**: Choose the supported original file using the file picker or drop zone. Check the accepted input types listed above the workspace. Read the operation note before starting, because supported syntax and file limits are part of the result contract. The original file is not overwritten or renamed by this workflow. 2. **Choose the intended result**: Review the controls for Page size, Custom width (points), Custom height (points), Margin (points). Change settings according to the file or text you actually supplied. Defaults are a starting point rather than a promise that every source uses the same conventions. A4 and Letter presets set actual page dimensions. Custom dimensions and margins are measured in PDF points, with 72 points per inch. 3. **Create and inspect the output**: Use the main action button to run pdf page size converter. Local processing checks the source and reports malformed or unsupported inputs. A completed job appears in Your results, with a download action and a preview when the output supports it. If the operation fails, read its message and correct the source or settings before retrying; changing only a filename does not change file contents. 4. **Save and verify the result**: Download the finished output and open it in the application or workflow that will consume it. Choose the original source, adjust the settings, create the result and inspect the saved output. Check the values, layout, encoding or parsed structure relevant to your task. Keep the source when you may need another set of settings later. Temporary job downloads are session-owned and expire; saving your own copy is the way to retain a result. ## Settings - **Page size**: Choose page size according to the result you need. Available choices: a4; letter; custom. The initial selection is a4. - **Custom width (points)**: Custom width (points) accepts values from 72 to 4000, in increments of 0.01. The initial value is 595.28. Change it for a specific output requirement, then check the result before processing more files. - **Custom height (points)**: Custom height (points) accepts values from 72 to 4000, in increments of 0.01. The initial value is 841.89. Change it for a specific output requirement, then check the result before processing more files. - **Margin (points)**: Margin (points) accepts values from 0 to 144, using whole numbers. The initial value is 24. Change it for a specific output requirement, then check the result before processing more files. ## Try pdf page size converter with a small source Choose one small supported PDF file. Use the initial settings, inspect the result and then change one setting to understand its effect. A4 and Letter presets set actual page dimensions. Custom dimensions and margins are measured in PDF points, with 72 points per inch. ## Check the result Choose the original source, adjust the settings, create the result and inspect the saved output. Fits visible content without cropping and keeps aspect ratio. Pages are rebuilt; forms, links, bookmarks and signatures may not carry over. 72 points = 1 inch. Open the saved output in the app or workflow where you plan to use it. Check one representative result before repeating the same settings with more files. The original files stay unchanged. ## Limits - Files are processed on this device. Browser memory and engine-specific limits apply. Save results before reloading. - Fits visible content without cropping and keeps aspect ratio. Pages are rebuilt; forms, links, bookmarks and signatures may not carry over. 72 points = 1 inch. - Upload one file with a combined size of at most 100 MB. The completed output must fit within 200 MB. - Files are checked by the local engine; a matching filename alone is not proof of valid contents. - Selections and completed jobs stay available while you navigate inside this tab. Use My files to revisit results. Reloading or closing the tab clears the workspace; download results you want to keep first. ## Questions ### What does PDF page size converter produce? Fit PDF pages onto A4, Letter or a custom page with adjustable margins. A4 and Letter presets set actual page dimensions. Custom dimensions and margins are measured in PDF points, with 72 points per inch. ### Which source should I use? Choose the supported original file using the file picker or drop zone. Check the accepted input types listed above the workspace. Supported file extensions are pdf. The processing engine checks actual contents; a matching extension alone does not make malformed content valid. ### Why did this input fail? Fits visible content without cropping and keeps aspect ratio. Pages are rebuilt; forms, links, bookmarks and signatures may not carry over. 72 points = 1 inch. Check syntax, required inputs and the ranges shown next to settings. An error keeps unsupported data from being presented as a successful conversion. Correct the source and retry rather than repeatedly resubmitting an unchanged invalid input. ### How should I check the download? Choose the original source, adjust the settings, create the result and inspect the saved output. Review the saved content in its destination application, including a typical case and any boundary values important to your use. A completed operation confirms processing finished; it cannot determine whether the supplied settings match your wider business requirements. ### Does PDF page size converter upload files to another service? Processing runs in this browser, on your device. Files and pasted input are not uploaded to a conversion server. The website and required engine assets must load first; large operations depend on available device memory. ### Can I continue after changing pages? Selections and completed jobs stay available while you navigate inside this tab. Use My files to revisit results. Reloading or closing the tab clears the workspace; download results you want to keep first. ## Related guides - [Merge PDF](https://localconverter.tech/merge-pdf.md) - [Split PDF](https://localconverter.tech/split-pdf.md) - [Images to PDF](https://localconverter.tech/images-to-pdf.md) - [PDF to TXT](https://localconverter.tech/pdf-to-txt.md) - [PDF to PNG](https://localconverter.tech/pdf-to-png.md)