Change Image DPI to 300 Online — FreeNew
Pick a DPI (300 for print), drop your PNG or JPG images and download them. Only the DPI value stored in the file changes: every pixel stays exactly the same, so there is no quality loss. Each image shows its current DPI and the size it will print at — a 3000 × 3000 px image prints at 10 × 10 in at 300 DPI. Up to 60 images at once.
Free, no sign-up, no watermark. Runs in your browser — your files are never uploaded.
Updated October 2026
How to change image DPI to 300
Pick a DPI
Choose 300 for sharp close-up prints, 150 for large formats seen from further away, 72 for screens, or type any value.
Drop your PNG or JPG images
Up to 60 at a time. Each card shows the image's current DPI, the size it will print at, and whether it will look sharp or soft.
Download
Save one file, or all of them as a ZIP. Only the DPI tag changes; the pixels are untouched.
How to check an image's DPI
Drop it into the tool above: each image shows the DPI stored in the file before you change anything. Without the tool:
- Windows: right-click the file, choose Properties, then Details, and look at Horizontal resolution.
- Mac: open the file in Preview and choose Tools, then Adjust Size. The Resolution field shows the DPI.
- Photoshop: Image, then Image Size, and read the Resolution field.
If a file has no DPI stored, most apps show 72 (Windows sometimes 96). That is only a default — it says nothing about how many pixels the image has.
Pixels you need for common print sizes
Pixels = inches × DPI. An 8 × 10 in print at 300 DPI needs 2400 × 3000 px. If your image has at least these pixels, setting the DPI is all you need to do. For any other size, use the DPI Calculator.
| Print size (inches) | At 300 DPI | At 150 DPI |
|---|---|---|
| 4 × 6 | 1200 × 1800 px | 600 × 900 px |
| 5 × 7 | 1500 × 2100 px | 750 × 1050 px |
| 8 × 10 | 2400 × 3000 px | 1200 × 1500 px |
| 11 × 14 | 3300 × 4200 px | 1650 × 2100 px |
| 16 × 20 | 4800 × 6000 px | 2400 × 3000 px |
| 18 × 24 | 5400 × 7200 px | 2700 × 3600 px |
| 24 × 36 | 7200 × 10800 px | 3600 × 5400 px |
| A4 (8.3 × 11.7) | 2480 × 3508 px | 1240 × 1754 px |
Changing the DPI vs resampling
There are two ways to “change DPI”, and they do very different things:
- Changing the DPI value (this tool, or Photoshop with Resample unticked): the pixels stay the same and only the print size changes. No quality loss.
- Resampling (Photoshop with Resample ticked, or any resize): the number of pixels changes. Shrinking throws pixels away; enlarging with a normal resize only stretches them, so a big print gets softer, not sharper.
If the table above says you need more pixels than you have, enlarge the image with the AI Image Upscaler, which rebuilds detail as it enlarges, or make it print-ready for a print-on-demand product in one go.
Change DPI in Photoshop, GIMP or Preview
- Photoshop: Image, then Image Size. Untick Resample, type the new Resolution in Pixels/Inch, click OK and save.
- GIMP: Image, then Print Size. Set the X and Y resolution in pixels/in, then export the file.
- Mac Preview: Tools, then Adjust Size. Untick Resample image, type the new Resolution and save.
Saving a JPG again in these apps re-compresses it a little each time. This tool changes only the DPI value, so the image itself is not touched.
Why print software rejects a “72 DPI” file
Every PNG and JPG can carry a small DPI record — the PNG pHYs chunk or the JPG JFIF density field — that tells a printer or print-on-demand partner how many of the image's pixels should land in each printed inch. Cameras, phones and most design tools default to 72 or 96 DPI, which is a leftover from early screen resolutions and has nothing to do with how many pixels the file actually has. Some print pipelines check that tag and warn or reject the file even when the pixel count is genuinely large enough — changing the tag to 300 clears that warning in seconds.
What the tag can't do is add detail. A 600 × 600 px image is still only 600 × 600 px after this tool sets it to 300 DPI — it will now print at a tiny 2 × 2 inches at that resolution instead of a soft 8.3 × 8.3 inches at 72 DPI. If you need it to print bigger and stay sharp, the pixels have to come from somewhere: use the AI Image Upscaler to add real detail first, then set the DPI here. The DPI Calculator is useful for checking exactly what size a given pixel count prints at before you commit.
What DPI should I use?
| DPI | Best for |
|---|---|
| 300 | Posters, framed prints, anything viewed up close |
| 150 | Large canvases, banners, big prints viewed from further away |
| 72 | On-screen use — DPI has no visual effect on a monitor |
Common mistakes
- Expecting the tag to fix a small file. If your design is genuinely low-resolution for the print size, no DPI tag changes that — upscale first.
- Setting a huge custom DPI to “trick” a checker. Some tools also compare the DPI against the pixel size and will still flag a mismatch — keep the tag honest and upscale if you need to.
- Re-saving through an editor afterwards. Opening the file again in some apps and re-exporting can reset the DPI tag back to a default — set it as your last step before uploading.
FAQ
Does changing the DPI make my image sharper?
No. DPI is a label stored inside the file that tells a printer how many pixels to fit per inch — it doesn't add or remove any pixels. If your file is too small for the print size you want, upscale it first, then set the DPI.
Why does Etsy or my print-on-demand partner say my file is the wrong DPI?
Most screenshots and web-exported images are saved at 72 DPI, and some print software reads that tag and rejects the file even though the pixel count might be fine. Setting the tag to 300 DPI here fixes that check instantly, as long as the image already has enough pixels for the size you're printing.
Does this recompress or resize my image?
No. The tool edits only the small DPI record inside the file (the PNG pHYs chunk or the JPG JFIF density field) and leaves every pixel byte exactly as it was — there is no re-encoding, so there is no quality loss.
What DPI should I use?
300 DPI is the standard for posters, framed art and anything viewed up close. 150 DPI is fine for large banners and canvases viewed from further away. 72 DPI is the historical default for screens and doesn't matter for on-screen use.
Does my image get uploaded anywhere?
No. Every file is read and rewritten in your browser, on your own device. Nothing is sent to a server, so there's no upload wait and your unreleased designs stay private.
Why only PNG and JPG?
PNG and JPG are the only common formats with a standard place to store a DPI value that print software actually reads (the pHYs chunk and the JFIF density field). WEBP and other formats don't have a widely supported equivalent.
How do I check the DPI of an image?
Drop it into the tool on this page: each image shows the DPI stored in the file. On Windows, right-click the file, choose Properties, then Details, and look at Horizontal resolution. On a Mac, open it in Preview and choose Tools, then Adjust Size.
What's the difference between DPI and PPI?
Strictly, PPI (pixels per inch) describes an image file and DPI (dots per inch) describes a printer's ink dots. In everyday use, and in Photoshop, Etsy and print-on-demand guides, “DPI” means the same as PPI, and that is the value this tool sets.
Can I change the DPI of a photo on my phone?
Yes. This page works in the browser on phones and tablets too: tap Choose images, pick your photos, and download them with the new DPI. Nothing is uploaded.