Change DPI of Image

Add your pictures to the box above and you will see the DPI stored in each one right away, next to its size in pixels and the size it would print at. Pick a new DPI, choose what should change, and press the red button.

Most people want to change DPI of image files for one reason: a print shop, a self-publishing site or a design program asked for a number like 300. This page sets that number, shows you what it means for the printed size, and tells you honestly when a picture has too few pixels for the job.

Before you change a thing, it helps to know where you stand. This is a simple way to check image DPI online: drop a picture on the box and the Now column shows the DPI saved inside the file, or Not set if the file has none. Nothing is changed until you press the button.

For JPG files the tool reads all three places a DPI can live: the JFIF header, the EXIF data written by cameras and phones, and the resolution block that Photoshop adds. For PNG files it reads the pHYs chunk. When these disagree, it shows the one that Photoshop and most other apps trust first.

DPI on its own tells you very little. What matters for printing is the DPI together with the pixels. So the list lets you check image DPI and size side by side: the stored DPI, the width and height in pixels, and the print size at the DPI you have picked, in cm, inches or mm.

Change the DPI in the settings and the print size column updates at once. That makes it easy to try 150, 300 and 600 and see which one gives you the printed size you need, before you save anything.

DPI stands for dots per inch. In a digital picture it is really a note saved in the file that says how many pixels should fit into one inch of paper. A picture 3000 pixels wide at 300 DPI prints 10 inches wide. The same picture at 150 DPI prints 20 inches wide.

The pixels are the real picture. The DPI only decides how big those pixels are spread when printed. Screens ignore it completely, which is why a picture looks the same on your phone whether it says 72 or 300 DPI.

To change DPI of image to 300, add the picture, leave 300 selected and keep the mode on Only the DPI. Press the button and the file now says 300 DPI. The pixels are not touched, so the picture looks exactly the same; only the print size gets smaller.

For example, a 2400 × 3000 pixel photo saved at 72 DPI would print at about 33 × 42 inches. After the change it prints at 8 × 10 inches, and every inch has 300 pixels. That is what most printers and publishers mean when they ask for 300 DPI.

Only the DPI is the mode to change DPI of image without changing size in pixels. The width, the height and every pixel stay the same. For JPG and PNG the file is not even re-saved: the tool copies the bytes and rewrites only the small DPI notes, so there is no quality loss at all.

If by size you mean the printed size, choose Keep the print size instead. Then the picture keeps its inches or centimetres on paper, and the tool adds or removes pixels to match the new DPI. The size column in the list always shows which of the two is changing.

You can change DPI of image online free here, with no sign-up, no watermark and no daily limit. The work is done by your own browser on your own device, so it is quick and private, and it works the same on Windows, Mac, Linux, Chromebook, iPhone and Android.

Only TIFF pictures need our server, because browsers cannot open them. They are converted and deleted straight away. Everything else, including the DPI reading, stays on your device.

To increase DPI of image to 300 for printing, first look at the pixels. If the print size column shows the size you need at 300 DPI, choose Only the DPI and you are done: the picture is ready and nothing was lost.

If the print size comes out too small, the picture simply has too few pixels for that size at 300 DPI. You can choose Set a print size, and the tool will add pixels so the numbers match. The file will pass a 300 DPI check, but it will not gain real detail. A larger original is always the better answer.

Some jobs ask for more. Line art, black and white comics, scanned text and fine logos are often printed at 600 DPI so thin lines stay crisp. To increase DPI of image to 600, pick 600 and choose Only the DPI if the picture already has enough pixels.

At 600 DPI every inch needs 600 pixels, so an 8 × 10 inch print needs 4800 × 6000 pixels. Most phone photos do not have that many. For photos, 300 DPI is usually plenty, and doubling the pixels only doubles the file size.

Choose Set a print size when you know the exact size on paper. Type the width and height in cm, inches or mm, pick the DPI, and each picture gets exactly the pixels it needs. With Keep proportions on, you type only the width and the height follows each picture's own shape.

This is the quickest way to prepare a set of photos for 10 × 15 cm prints, A4 posters or a 6 × 9 inch book. If you need to cut the picture to a new shape first, use Crop Image, then come back here to set the DPI.

To change DPI of JPG files, leave the mode on Only the DPI. A JPG can store its DPI in up to three places, and the tool updates all of them that exist, so Windows, Photoshop, Word and print shop software all read the same number.

The compressed image data is copied byte for byte. That means no second round of JPG compression and no quality loss, and the file size stays almost exactly the same. It is also very fast, even for large camera files.

To change DPI of PNG files, the tool writes the new value into the pHYs chunk, which is where PNG keeps its resolution. If a PNG has no pHYs chunk yet, one is added. The picture data, the transparency and the colours are not touched.

This is handy for logos, stickers, sublimation designs and print-on-demand artwork, which are often PNG because of the transparent background. The file stays a PNG, keeps its transparency and simply says the new DPI.

Think of this page as a 300 DPI image converter that is honest about what it does. With Only the DPI it changes the number. With Keep the print size or Set a print size it also changes the pixels, saved at high quality (95%) with the new DPI written in.

It is useful for Amazon KDP book interiors and covers, Etsy printables, Redbubble and other print-on-demand shops, local print shops and photo labs. Each of them talks about DPI, but what they really check is whether you have enough pixels for the print size.

Many pictures carry no DPI at all. Screenshots, pictures saved from websites and files from some apps often show Not set. Programs then guess: Photoshop and Mac apps usually assume 72 DPI, while Windows and Word usually assume 96 DPI.

Under More options you can tell the tool which guess to use. It only matters for Keep the print size, which needs to know the old DPI to keep the paper size the same. Only the DPI and Set a print size work the same either way.

JPG and PNG keep their format and get the new DPI directly. WebP, HEIC, GIF, BMP and TIFF cannot hold a DPI value that every program reads, so HEIC and AVIF photos are saved as JPG and WebP, GIF, BMP and TIFF as lossless PNG (transparency kept), with the new DPI written in.

iPhone HEIC photos open without any setting. TIFF files are read by our server, because browsers cannot open them, and deleted straight away. If you only want to switch format without any DPI change, HEIC to JPG and PNG to JPG do that job.

Add up to 200 pictures at a time, each up to 100 MB. The list shows every file with its current DPI, pixels and new print size, so you can spot the odd one out before you start. Remove any picture with the small cross.

When the change is done, save files one by one or press Download all to get a single ZIP. By default each name gets a suffix such as -300dpi, so the new files never mix with the originals. You can switch the suffix off under More options.

Amazon KDP asks for 300 DPI for book interior images and covers. In practice the check is about pixels: a full-page picture in a 6 × 9 inch book needs about 1800 × 2700 pixels, plus a little extra if it runs to the edge of the page. The table above shows the numbers for other sizes.

Etsy sellers of printable art usually set their files to 300 DPI so buyers get a clean print at home or at a photo lab. Redbubble and similar print-on-demand sites care most about large pixel sizes, so check their upload guide and use Set a print size if you need exact dimensions.

Word, InDesign, Publisher and other layout programs use the DPI to decide how big a picture appears when you place it. A 3000 pixel wide picture at 72 DPI arrives huge; at 300 DPI it arrives 10 inches wide. Changing only the DPI fixes this without touching the picture.

Once the picture is in your document, you can still scale it. If you plan to put the pages into a PDF, Image to PDF turns a set of pictures into one file, ready to send to a printer.

Photo labs print most sizes happily from 300 DPI, and many are fine with less for large prints viewed from a distance. Phone photos are usually 4000 pixels wide or more, which is plenty for a 10 × 15 cm or 5 × 7 inch print at 300 DPI.

If a photo is very large and you want a smaller file to email to the lab, set the print size here, then use Compress Image to make the file lighter. To change only the pixel size for the web, Resize Image is the better tool.

Changing the DPI alone does not add detail or sharpness. It changes a number in the file and the size the picture prints at. A blurry picture at 72 DPI is still blurry at 300 DPI, only smaller on paper.

Adding pixels with Keep the print size or Set a print size makes the file bigger, not sharper. The new pixels are smooth guesses from the old ones. This page does not use AI upscaling, and it does not pretend to. For a sharp large print, start from the largest original you can find: the camera file, the first export, or a higher quality scan.

Your pictures are not uploaded. The DPI is read and written by your own browser, and the pixels are resampled on your own device when needed. The only exception is TIFF, which browsers cannot open: those files go to our server, are converted, and are deleted straight away.

There is no account and nothing is kept. Close the tab and every picture is gone from memory.

When you add a picture, the tool reads the first part of the file to find its DPI and pixel size. For JPG it looks at the JFIF header, the EXIF data and Photoshop's resolution block; for PNG it looks at the pHYs chunk.

With Only the DPI, JPG and PNG files are copied as they are and only those small notes are rewritten. In the other modes, or for other formats, the shared image engine on this site resamples the picture to the new pixel size and saves it at 95% quality with the new DPI.

Check the print size column before you press the button. It tells you more than the DPI number does.

Use Only the DPI whenever the pixels are already enough. It is lossless for JPG and PNG and leaves the file size almost unchanged.

For photos, 300 DPI is the common standard. Keep 600 DPI for line art, scans of text and fine logos.

Keep the -300dpi suffix on, so the new files never overwrite or mix with your originals.