# DPI checker and converter > Browser-only file conversion. Selected files are processed on this device and are not uploaded to a conversion server. Source: https://localconverter.tech/image-dpi Inspect an image’s print-resolution information or write a new DPI value to a JPG or PNG copy. You can change only the print metadata or resample pixels to preserve the interpreted printed size. This distinction helps when preparing images for layouts that use DPI to determine placement dimensions. ## Useful tasks - Check a photograph’s stored DPI - Write 300 DPI metadata for a layout - Resample while retaining an interpreted print size ## Steps 1. **Choose the source image**: Add one supported still raster image. If the original has no stored DPI, remember that resampling uses a seventy-two-DPI assumption for its calculations. 2. **Inspect or write DPI**: Select Inspect DPI for a JSON report, or Write DPI for an image output. Enter the requested DPI only when creating a new image copy. 3. **Decide whether to resample**: Leave resampling off to retain the pixel dimensions, or enable it to scale pixels according to the old and new print-resolution values. 4. **Check the resulting interpretation**: Run Create output and download the report or image. In a print-layout application, confirm both pixel dimensions and the physical size inferred from the stored DPI. ## Settings - **Action**: Choose action according to the result you need. Available choices: Write DPI; Inspect DPI. The initial selection is Write DPI. - **Output DPI**: Output DPI accepts values from 1 to 2400, using whole numbers. The initial value is 300. Change it for a specific output requirement, then check the result before processing more files. - **Resample to preserve printed size**: Turn “Resample to preserve printed size” on only when it matches your intended result. The initial state is off. Read the workflow and output limitations below when this changes how the original content is processed. - **Output format**: Choose output format according to the result you need. Available choices: PNG; JPG. The initial selection is PNG. ## A layout-ready copy without extra pixels A designer needs an image tagged at 300 DPI while preserving its pixel dimensions. Choose Write DPI, enter 300 and leave resampling disabled. Export JPG or PNG, then check the size at which the layout application places the new copy. ## Check the result Upload a supported file, adjust the settings and create the output. Changing DPI alone changes print metadata, without adding image detail. Missing input DPI is treated as 72 when resampling. 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. - Changing DPI alone changes print metadata, without adding image detail. Missing input DPI is treated as 72 when resampling. - 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 ### Does writing DPI improve image detail? No. Writing DPI without resampling changes print metadata, not pixel information. The same pixels may be interpreted as a smaller or larger physical print, but missing texture or detail is not recovered by the metadata value. ### What does preserving printed size mean? With resampling enabled, the tool changes pixel dimensions in proportion to the new DPI relative to the original DPI. This aims to keep the interpreted physical size similar while changing how many pixels represent that area. ### What if the source has no DPI? When resampling, missing input DPI is treated as 72. That assumption may differ from your intended print size, so inspect the source dimensions and consider the dedicated physical-size resizer when you know the exact measurements. ### What does Inspect DPI download? Inspection creates a JSON report with image dimensions, stored DPI and related properties. It does not alter the image. A missing or unusual DPI value in that report should be interpreted separately from the photograph’s pixel dimensions. ### Does DPI checker and 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 - [Compress image](https://localconverter.tech/compress-image.md) - [Resize image](https://localconverter.tech/resize-image.md) - [Crop & rotate image](https://localconverter.tech/crop-image.md) - [HEIC / HEIF converter](https://localconverter.tech/heic-converter.md) - [JPG to JPG](https://localconverter.tech/jpg-to-jpg.md) - [JPG to PNG](https://localconverter.tech/jpg-to-png.md)