UtilityKit

500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.

Image DPI Changer

Change DPI metadata to 72, 150, 300, 600 or custom value. Pixels stay the same — only the DPI tag is rewritten.

About Image DPI Changer

DPI (dots per inch) is metadata that tells printers and Office apps the intended physical size of an image — pixel dimensions don't change, only the printed size does. A 300 DPI photo at 1200×1800 prints as 4×6 inches; the same photo at 72 DPI claims it should print as ~16×25 inches. Print labs reject photos under 300 DPI; LinkedIn and websites prefer 72 or 96 DPI metadata. This tool rewrites the DPI metadata directly: for JPG it edits the JFIF density bytes, for PNG it inserts or replaces the pHYs chunk. The pixel data is byte-for-byte identical to the source — only the metadata changes. No re-encoding, no quality loss, no canvas round-trip. Output is the source file with patched metadata. Files never leave your browser. Perfect for print preparation, resume photo requirements, and any workflow where the DPI tag matters.

Why use Image DPI Changer

True metadata edit

True metadata edit — JPG JFIF density bytes and PNG pHYs chunk are patched directly. No canvas re-encoding means zero quality loss and the output is byte-for-byte identical to the source apart from the metadata change.

Pixel dimensions stay exactly

Pixel dimensions stay exactly the same — the DPI tag is purely metadata. A 1200×1800 image at 72 DPI versus 300 DPI is identical at the pixel level, only the implied print size in inches changes.

5 preset DPI values

5 preset DPI values plus custom input — 72 (web), 96 (Office default), 150 (draft print), 300 (commercial print), 600 (fine art print). Type any value from 1 to 9999 for unusual requirements.

Print size preview

Print size preview — the result panel shows the calculated print size in both inches and centimetres at the new DPI, so you can verify the photo will print at the right physical size.

100% browser-local

100% browser-local — your photos never leave your device. ID photos, passport scans, resume photos, and design assets all stay private throughout the metadata edit.

Lossless and instant

Lossless and instant — DPI patching is a metadata change, not a pixel re-encode. Output is generated in milliseconds even for very large files (50 MB photos process instantly).

How to use Image DPI Changer

  1. Drop a .jpg or .png file onto the upload zone (WebP and other formats don't carry DPI metadata).
  2. Pick a target DPI from the presets (72 web, 96 Office, 150 draft print, 300 print, 600 fine print) or type a custom value.
  3. Click Change DPI — the tool reads the file's binary structure and patches the DPI metadata bytes directly, no canvas re-encoding.
  4. Review the print size at the new DPI — the tool shows the resulting inches and centimetres at your chosen DPI value.
  5. Download the patched file with the new DPI tag — pixel data is identical to the source, only the metadata changes.
  6. Use the file in your print workflow, resume submission, or any application that reads DPI metadata.

When to use Image DPI Changer

  • Submitting a photo to a print lab that requires 300 DPI — most labs reject photos at 72 DPI even when the pixel dimensions are sufficient for high-quality printing.
  • Preparing a passport photo, visa photo, or ID photo for a government form that specifies a minimum DPI value alongside pixel dimensions and file size.
  • Setting 72 DPI metadata on website images so design tools and CMS uploaders show the correct on-screen size, even though browsers ignore DPI for rendering.
  • Updating a resume headshot's DPI to 300 before submitting to a recruitment portal or print magazine that requires print-ready DPI metadata.
  • Building a design system asset library where every image needs a consistent DPI value (72 for web, 300 for print) for tooling consistency.
  • Fixing a photo that won't print at the expected size in Word, PowerPoint, or InDesign because the embedded DPI tag tells the app to render it at the wrong scale.

Examples

Resume photo to 300 DPI

Input: headshot.jpg: 600×800, 72 DPI, 145 KB

Output: headshot_300dpi.jpg: 600×800 (same pixels), 300 DPI, 145 KB

Web image to 72 DPI

Input: screenshot.png: 1920×1080, 96 DPI, 280 KB

Output: screenshot_72dpi.png: 1920×1080 (same pixels), 72 DPI, 280 KB

Print preparation 600 DPI

Input: artwork.jpg: 6000×4000, 96 DPI, 12 MB

Output: artwork_600dpi.jpg: 6000×4000 (same pixels), 600 DPI, 12 MB

Tips

  • DPI is metadata, not resolution — to actually change the image's printable detail, you need to resize the pixel dimensions. Use Image Resize for that, then DPI Changer to set the metadata.
  • Browsers ignore DPI metadata when rendering images on screen — every pixel is rendered at the screen's native pixel ratio. DPI only matters when an app calculates print size or imports for print.
  • 300 DPI is the default for commercial print; 600 DPI is for fine-art reproductions and some passport requirements. Above 600, most printers can't actually resolve the extra detail.
  • WebP doesn't have a standard DPI metadata location — that's why this tool only handles JPG and PNG. To set DPI on a WebP-sourced image, convert to JPG or PNG first using one of our format converters.
  • If your file already has a pHYs chunk (PNG) or JFIF density (JPG), the tool overwrites the existing values. If neither is present, the tool injects a fresh metadata block.

Frequently Asked Questions

Does my image leave my browser?▾
No. The DPI metadata is patched directly in the file binary inside your browser tab using ArrayBuffer manipulation. No canvas re-encoding, no upload, nothing is sent to any server including UtilityKit's.
What's the size limit?▾
Up to 50 MB per file on the dropzone label. The actual limit is your browser's memory — DPI patching is essentially free in compute terms (just byte manipulation), so even very large files process instantly with no performance cost.
Will the pixel dimensions or quality change?▾
No. DPI is purely metadata — the pixel data is byte-for-byte identical to the source. The output file is the same JPG or PNG with only the DPI metadata bytes patched. There is zero re-encoding and zero quality loss.
Why doesn't my photo print larger after changing DPI?▾
DPI is a hint to print software, not a resolution upgrade. A 600×400 image at 300 DPI still has 600×400 pixels — it just claims to be a 2×1.33 inch print rather than a 6×4 inch print. To actually print larger, you need to resize the pixels, not change the DPI metadata.
Why are WebP and HEIC not supported?▾
WebP doesn't have a standardised DPI metadata location in its container format. HEIC stores DPI in EXIF, which would require a different patching approach. Convert WebP/HEIC to JPG or PNG first using our format converters, then set DPI.
Will browsers display my image differently after DPI change?▾
No. Browsers ignore DPI metadata for screen rendering — every pixel is rendered at the device pixel ratio regardless of the embedded DPI tag. DPI only matters when an app calculates print size or imports for print layouts.
What's the difference between 72 DPI and 300 DPI?▾
Same pixels, different implied print sizes. 72 DPI is the historical 'web' value (claims roughly screen-size print), 300 DPI is the commercial print standard (claims sharper, smaller print at the same pixel count). The pixel data is identical — only the metadata tag differs.
Will Photoshop / Office / InDesign respect the new DPI?▾
Yes. All major image-aware applications read the JFIF density (JPG) or pHYs chunk (PNG) when importing an image and use it to calculate the default placement size in the document. The tool writes both to the spec correctly so all standard apps recognise the new value.

Explore the category

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DPI vs PPI vs Print Size: What Resolution Numbers Actually Mean Changing the DPI metadata on an image does not add a single pixel — yet print shops keep asking for 300 DPI and people keep adjusting the wr Mar 2026 · 9 min How AI Image Upscaling Beats Bicubic Interpolation Old image upscaling guesses pixels with smooth math. AI upscalers like ESRGAN and Real-ESRGAN hallucinate plausible detail learned from mill Mar 2026 · 9 min Image Formats Explained: JPEG, PNG, WebP, AVIF, GIF Compared Choosing the wrong image format can double your page weight or break compatibility in older browsers. This guide cuts through the noise with Apr 2026 · 9 min

Glossary

DPI (dots per inch)
A metadata value telling apps and printers the intended physical size of an image. 300 DPI means each printed inch contains 300 dots; the pixel dimensions divided by DPI give the print size.
JFIF density bytes
The DPI metadata location in a JPEG file. Bytes at offset 13-16 of the JFIF APP0 segment store the X and Y density. Units byte at offset 11 specifies inches (1) or centimetres (2).
PNG pHYs chunk
An ancillary PNG chunk storing pixels-per-meter for X and Y axes plus a unit byte. The chunk includes a 4-byte CRC32 checksum that this tool computes correctly when patching.
Print size
The intended physical dimensions of a printed image, calculated as pixel dimensions divided by DPI. A 3000-pixel-wide image at 300 DPI prints as a 10-inch-wide page.
PPI vs DPI
Pixels per inch (screens) and dots per inch (printers) are technically different but are used interchangeably in image metadata. Both refer to the same density value stored in the file.
Pixel data
The actual colour values of every pixel in the image. DPI is metadata — it does not affect pixel data. To change the number of pixels, you need to resize, not re-DPI.