Resize an image in inches for a lab order, a frame or a Letter-size flyer: they state inches, and a file only has pixels. This page converts at 300 DPI, opens the editor on 4 × 6 in, and settles whether your 4 × 6 means inches or centimetres. Part of the image resizer.
Resize image in inches: inches to pixels at 300 DPI
1 in at 300 DPI
300 pxcomputed
4 × 6 in
1200 × 1800 px, the size this page opens oncomputed
Letter, 8.5 × 11 in
2550 × 3300 pxcomputed
The formula
pixels = inches × DPIWikipedia, Pixel density
A DPI tag in a file
metadata only: it changes no pixelWikipedia, Dots per inch
Output format
– / –
Drop images or browse
JPEG · PNG · WEBP · AVIF · HEIC · up to 50 at once · max 30 MB each
HEIC
PNG
JPEG
AVIF
WEBP
Advanced settings1 on
SmallerAutoBetter
Auto tunes each image.
A hard cap for the number your form demands.
KB
A floor for forms that refuse small files.
Max resolution
×
Empty side keeps the ratio. Never enlarges.
Presets
Every named size, one editor
The same editor, the size already pressed. Pick the document or the platform.
Source: photo.jpg, 576.8 KB at 1920×1280, through the preset this page opens on (the centre cropped to the ratio and scaled to the size), then the engine at its defaults. The row is the real output.
Every byte count is the size of the actual file our engine produced from the named source, the same bytes you would download, not an estimate. The reference photo is one of our own photographs, an iguana on a branch, and the camera photo is a real one too. Drop your own file into the tool above to rerun any of them. How we measure names the sources and the settings.
Answered
How many pixels is an inch, and why 300 of them?
300 pixels, at 300 DPI, and inches are the one unit where that is the whole arithmetic: pixels equal inches times the DPI, with nothing to round.
The DPI is the part people skip. A pixel has no length of its own; it gets one when a printer lays it down at a density. So a 4 × 6 print holds 1200 × 1800 pixels at 300 DPI and half as many at 150. 300 is the print convention, about the point past which the unaided eye stops seeing more detail at reading distance, and the resolution the spec card above converts at. A lab that quotes another figure overrides it, and the inches multiply by that figure instead. What the number in the file’s header says is beside the point: a DPI tag is metadata, it moves no pixel, and a lab prints the pixels at the size you order.
Computed
How many pixels are 2 × 2, 3.5 × 5, 4 × 6, 5 × 7 and 8 × 10 inches at 300 DPI?
The lab and frame sizes, computed on this page by the arithmetic the editor runs.
Every inch figure lands on a whole pixel, so there is no rounding column here; the millimetre column is the same size for a European order. The ratios are the reason a photo cropped for one print does not fit the next: 4 × 6, 5 × 7 and 8 × 10 are three different shapes.
Size
Pixels at 300 DPI
Millimetres
Ratio
2 × 2 in
600 × 600
50.8 × 50.8
1:1
3.5 × 5 in
1050 × 1500
88.9 × 127
7:10
4 × 6 in
1200 × 1800
101.6 × 152.4
2:3
5 × 7 in
1500 × 2100
127 × 177.8
5:7
8 × 10 in
2400 × 3000
203.2 × 254
4:5
Computed at render time from pixels = inches × 300, and millimetres from the inch's definition, 25.4 mm. Every figure is exact.
Answered
Does 4 × 6 mean inches or centimetres?
Both are real, and they are two different photos.
4 × 6 inches is the standard lab print, 1200 × 1800 pixels at 300 DPI and 101.6 × 152.4 mm on paper, the size a lab also sells as 10 × 15 cm. 4 × 6 centimetres is a picture the size of an ID frame, 472 × 709 pixels at the same density, under half the print on each side. Read the unit written beside the number. When none is written, ask who wants it: a lab, a frame or a print kiosk sells inches, and a size that arrives with a document belongs with the centimetre reading. The editor takes both: leave the unit on in or switch it to cm, type 4 and 6, and the line under the fields prints which pixel count you are about to export. The shape is 2:3 either way, so the crop you place is the same; only the pixels differ.
Answered
DPI converter, change the DPI of an image: what DPI stands for and what it does
DPI stands for dots per inch, and it is a number written into a file to say how large it should print.
It changes nothing about the pixels. A DPI converter is doing one of two jobs: rewriting that number, which changes the printed size and not the picture, or resizing the pixels so a physical size lands at a chosen density, which is what this page does. Ask for 4 × 6 inches at 300 DPI and you get 1200 × 1800 pixels; ask for 150 DPI and you get 600 × 900, a smaller file that prints the same size at half the detail. Type the inches above and the pixels follow at 300 DPI, the density labs and portals assume.
Answered
How do I resize an image in inches with the editor?
On the Crop tab the Custom size box opens in inches and reads the size in force, 4 and 6 on arrival, with the readout at the top of the panel showing 1200 × 1800.
The unit menu under the two fields switches to px, mm or cm when a form states those. Decimals are fine: 3.5 and 5 go in as written. The link icon between the fields holds the shape while you type, so tap it to unlink before entering a size with a different shape, then type both sides. The line under the fields prints the pixels as you go, and Apply makes them the export size. For a landscape print, type the wide side first: 6 and 4 gives 1800 × 1200. The ID & print tiles above the box carry Print 4×6″ and 5×7″ as one-tap landscape sizes.
Answered
Why does a 4 × 6 print always cut something off a phone photo?
Because a phone photo is 4:3 and a 4 × 6 print is 3:2.
Held the same way, the print keeps 89 percent of the photo’s height and loses a strip top and bottom. Turned upright into a portrait 4 × 6 it keeps 50 percent of the width. That is arithmetic, not a fault, and the Crop / Fit switch under the size tiles gives you the two honest ways out. Crop cuts to the print’s shape and lets you drag the frame to choose the strip you lose. Fit keeps the whole picture inside 1200 × 1800 pixels and fills the remainder with a colour, white by default, so the print carries a band on two sides instead of losing an edge. Stretching, the third way, is the one the editor refuses: it fits the frame by making everyone in it wider. The 4x6 photo size page has each lab’s own pixel figures and the prints that keep a phone photo whole.
Measured
Does my photo have enough pixels for the print?
Divide its pixels by 300 and you have its size in inches at print quality.
A 1000-pixel-wide photo prints 3.33 inches wide at 300 DPI, or 5 inches if you accept 200. Our 1920 × 1280 reference photo is 6.4 × 4.27 in at 300 DPI, enough for a 6 × 4 print held wide. Its upright 2:3 crop, 853 × 1280, is 2.84 × 4.27 in. That is short of a 4 × 6, and the preset exports 1200 × 1800 regardless, because an exact size is the promise. So the engine enlarged the crop 1.4 times and saved it at 237 KB: more pixels, no more detail. The 9.8 MB camera photo the home page uses is 4964 × 2782, which covers 16.55 × 9.27 in at 300 DPI, an 8 × 10 with room to spare. When a photo falls short, order the smaller print, or tell the lab which density you accepted.
Photo
Pixels
Inches at 300 DPI
Result
What changed
Reference photo, as uploaded
1920×1280
6.4 × 4.27 in
576.8 KB
the source
At 4 × 6 in
1200×1800
4 × 6 in
237 KB
crop enlarged 1.4×, no more detail
Source: photo.jpg, our reference photo, 576.8 KB at 1920×1280, through this page's preset (the centre cropped to 2:3 and scaled to 1200 × 1800), then the engine at its defaults. The inch figures are the pixels divided by 300.
Be sure first
When inches are the wrong unit
The lab wants 150 or 600 DPI?
The box converts at 300 only. Multiply the inches by their DPI and type the pixels with the unit on px.
The form states pixels?
Type pixels. A form that prints inches beside them is describing the pixels, not adding a second rule.
A screen, a slide, a wallpaper?
No unit applies but the pixel. The 1920 × 1080 page opens on the Full HD frame with no DPI in sight.
A 2 × 2 in passport photo?
The 2 × 2 in page opens on the frame with the rules and their source. This page has the arithmetic.
The size is already pressed above. One drop settles most of these.
Q:How many pixels is a 4 × 6 photo?
1200 × 1800 pixels at 300 DPI, when 4 × 6 means inches, the lab print. Inches are the easy unit: multiply by 300 and there is nothing to round. When the number means 4 × 6 centimetres, a picture the size of an ID frame, the answer is 472 × 709 pixels at the same density. The Custom size box opens in inches, and its unit menu switches to cm; type 4 and 6 either way.
Q:How do I resize a photo to 4 × 6 inches?
Drop it into the tool. The editor opens on the Crop tab with 4 × 6 in already in force, 1200 × 1800 pixels at 300 DPI, the frame drawn at 2:3 on the photo. Drag the frame over the part you want printed, or press Fit to keep all of it on a fill colour, then Save. For a landscape print, unlink the sides, type 6 and 4 instead, and the frame turns.
Q:What DPI should a 4 × 6 print be?
300 DPI is the figure to aim for, and the one the editor converts at. It is the print convention, about the density past which the eye stops seeing extra detail at reading distance. A lab that names another figure, 150 or 600, overrides it: multiply inches by its DPI and type the pixels instead.
Q:What does DPI stand for?
Dots per inch: a number written into a file to say how large it should print. It changes nothing about the pixels; a lab prints the pixels at the size you order. The density matters when you resize: at 300 DPI, the print convention, one inch is 300 pixels, so a 4 × 6 inch print needs 1200 × 1800.
Q:How do I make an image 150 DPI?
Resize it to the pixels 150 DPI gives. Multiply the inches by 150 and type the result into Custom size with the unit on px: 4 × 6 inches becomes 600 × 900. The box converts at 300 only. Rewriting the DPI number alone moves no pixel; it only changes the size a program says the file prints.
Q:How do I do a DPI check on a photo?
Divide its pixels by the print size in inches. A photo 1200 pixels wide printed 4 inches wide is at 300 DPI, the print convention; printed 8 inches wide it is at 150, half the detail. Ignore the DPI number in the file's header: it is metadata, it moves no pixel, and a lab prints the pixels at the size you order.
Q:Is 4 × 6 inches the same as 10 × 15 cm?
Near enough for a lab, not for a pixel check. 4 × 6 inches is 101.6 × 152.4 mm, so a shade over 10 × 15 cm; at 300 DPI that is 1200 × 1800 pixels against 1181 × 1772 for the metric size. Labs sell the two as one print size. A form that names one of them wants that one's pixels, and the centimetre page opens on 10 × 15 cm.
Q:What is the difference between 4 × 6 inches and 4 × 6 cm?
A factor of 2.54, and a different job. 4 × 6 inches is the standard lab print, 1200 × 1800 pixels at 300 DPI. 4 × 6 centimetres is a picture the size of an ID frame, 472 × 709 pixels. Read the unit beside the number; when none is written, a lab or a kiosk sells inches and a document form means centimetres. Both share the 2:3 shape, so only the pixel count changes.
Q:How do I resize an image to 8.5 × 11 inches?
The Custom size box is already in inches: unlink the sides, type 8.5 and 11, and press Apply; the line under the fields reads 2550 × 3300 px at 300 DPI, which is Letter paper. A phone photo has fewer pixels than that on its short side, so the export is enlarged to reach it; for a flyer viewed at arm's length that is usually fine, for a framed print it is not.
Q:What size is a 5 × 7 print in pixels?
1500 × 2100 pixels at 300 DPI. The ratio is 5:7, a little squarer than 4 × 6, so a photo cropped for one does not fit the other without a second crop. Unlink the sides, type 5 and 7 into the Custom size box, press Apply, and the frame redraws at that shape; drag it to the part of the picture you want, then Save.
Q:Will my photo be cropped to fit 4 × 6?
Yes, unless you press Fit. A phone photo is 4:3 and a 4 × 6 print is 3:2, so held the same way the print keeps 89 percent of the height and loses a strip top and bottom; you drag the frame to choose which strip. Fit keeps the whole picture inside 1200 × 1800 pixels and fills the remainder with a colour, so the print carries a band instead.
Q:Can I resize in inches without losing quality?
Yes, when the photo has at least as many pixels as the print needs. Scaling down keeps detail and the save encodes once at high quality. The loss comes from the other direction: an exact-size preset enlarges a small photo to reach the size, and enlargement invents nothing. Our 1920 × 1280 reference photo's 853 × 1280 crop is enlarged 1.4 times to reach 4 × 6 in, and gains no detail doing it.
Q:How many pixels is an 8 × 10 print?
2400 × 3000 pixels at 300 DPI, and its ratio is 4:5, squarer again than 5 × 7 or 4 × 6. Most camera photos are 3:2 and most phone photos 4:3, so an 8 × 10 crops some width from both. Unlink the sides, type 8 and 10, Apply, and place the frame; or press Fit and take the whole picture with bands at the sides.
Q:Can I resize a landscape photo to 6 × 4 instead of 4 × 6?
Yes. The preset is 4 wide by 6 tall; for a landscape print unlink the sides, type 6 and 4 into the Custom size box and press Apply, and the export is 1800 × 1200 pixels. The ID & print tiles also carry Print 4×6″ and Print 5×7″ as landscape sizes, one tap each. The pixel count is the same either way; only the frame turns.
Q:Do you keep my photo after I resize it?
No. We keep nothing: files are processed and wiped automatically, never archived and never used for anything else. Saving strips EXIF metadata, GPS location included, by default, so the file you send to a lab or upload to a kiosk carries no record of where it was taken. No account, no watermark, and the resize is free.
