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Change Image DPI

Change or increase the DPI of a PNG or JPEG online without losing quality. This DPI converter sets 72, 96, 150, 300, 600 or a custom value and downloads instantly.

Drop a PNG or JPEG to change its DPIPixels are never re-encoded — zero quality loss

What is the Change Image DPI?

Change Image DPI rewrites only the resolution metadata inside your file — the PNG pHYs chunk or the JPEG JFIF density fields — without touching a single pixel.

  • Lossless — pixels are never re-encoded, only metadata is rewritten
  • Supports PNG (pHYs chunk) and JPEG (JFIF density)
  • Presets for 72, 96, 150, 300 and 600 DPI plus custom values
  • Shows the file's current DPI before you change it
  • Instant download, original file size preserved
  • 100% local processing — nothing is uploaded

How to use the Change Image DPI

  1. 1

    Drop a PNG or JPEG into the upload area.

  2. 2

    The current embedded DPI (if any) is shown for reference.

  3. 3

    Pick a preset DPI — 72, 96, 150, 300 or 600 — or enter a custom value.

  4. 4

    Click Change DPI, then download the updated file.

About the Change Image DPI

Change Image DPI rewrites only the resolution metadata inside your file — the PNG pHYs chunk or the JPEG JFIF density fields — without touching a single pixel. Because the image is never decoded and re-encoded, there is zero quality loss: the photo bytes stay exactly as they were, only the declared DPI changes.

This is exactly what you need when a print shop, journal, visa application or university portal demands '300 DPI images' — your pixels are usually fine; only the metadata label needs updating. Choose a common preset (72, 96, 150, 300, 600) or type a custom value.

The rewrite happens locally in your browser, byte-by-byte. Your image is never uploaded, so documents, ID photos and client artwork remain completely private.

Frequently asked questions

How do I change an image to 300 DPI?

Upload your PNG or JPEG, select the 300 DPI preset and click Change DPI, then download. The tool rewrites the density metadata in place, so the image instantly reports 300 DPI to print software without any quality loss.

How do I increase the DPI of an image online?

Drop the image in, pick a higher preset like 300 or 600, or type a custom value, then download. This DPI converter raises the declared density in the metadata online and locally, so no file ever leaves your browser.

Does changing DPI reduce image quality?

Not with this tool. It edits only the metadata bytes that store the DPI value and leaves the compressed pixel data untouched. The downloaded file has identical pixels to the original — just a different declared resolution.

Does increasing DPI add more detail or change the pixel size?

No. DPI is just a label mapping pixels to physical inches; it cannot invent detail and it does not change the pixel dimensions. Raising DPI makes the intended print size smaller and denser. To change the actual size, resize or upscale the image with a resizer first.

Why does a print service ask for 300 DPI?

Printers lay ink at high density, and 300 pixels per printed inch is the threshold where photos look sharp at arm's length. Services check the metadata field, so setting your file to 300 DPI satisfies the requirement as long as the pixel count matches your print size.

Can I change the DPI of a WebP or GIF here?

This DPI editor rewrites PNG and JPEG density metadata, the two formats print workflows use. For WebP or GIF, first convert to PNG or JPEG with a converter tool, then set the DPI here.

Guides for Change Image DPI

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