Image Size Finder

A tool that tells you how big a picture is: its width and height in pixels, its file size, and what those mean for printing or uploading. This one reads the numbers straight from the file, so it also works for formats your browser can’t display.

No. For files you choose, drop or paste, the image size finder reads the file’s header with JavaScript in your browser and nothing is sent anywhere. Only the Image link and Web page tabs use the server, because a browser can’t read another site’s files directly; the server downloads the start of each image, reads its size and forgets it. When you make a copy of an image whose site won’t let your browser read it, the server fetches that one image whole (up to 4 MB) and passes it straight back.

No. Results live only in the open tab. Reload, close the tab or press Clear all and they are gone; nothing about your files is saved in the browser or anywhere else.

Your file is never changed. Measuring only reads it. If you press Make the copy under a failed upload check, the image size finder saves a separate new file in your browser and leaves the original exactly as it was.

The image size finder reads only what affects size: dimensions, the rotation flag, stored DPI, color format, bit depth and frame count. Camera settings and location are left alone and never displayed or sent anywhere.

Once the page has loaded, measuring local files keeps working without a connection, because it all happens in your browser. The Image link and Web page tabs need the internet.

Local files are measured as soon as they are dropped, usually in a few milliseconds each, because only the header is read. A link takes about as long as the other server needs to answer; a web page scan can take up to 30 seconds.

Pixel sizes are read exactly as the file states them, so there is no rounding. Before launch the results were checked against macOS’s own image tool and Chrome’s decoder on JPEG, EXIF-rotated JPEG, HEIC, AVIF, PNG, TIFF, GIF, BMP and SVG test files, and against hand-worked print sizes.

Both. Phones often save a portrait photo as a landscape image plus an EXIF flag that says “rotate 90°”. Viewers obey the flag and show 3024 × 4032, while the pixels in the file are stored as 4032 × 3024. The image size finder shows the upright size first and tells you when the file is stored sideways, since some older programs and upload checkers read the stored size.

Both are in use. macOS, iPhones, Android and most upload forms count 1 KB as 1,000 bytes. Windows Explorer counts 1 KB as 1,024 bytes (strictly a KiB). A 542,753-byte file is 542.8 KB on a Mac and 530 KB in Windows. The image size finder leads with the 1,000-based figure, shows the Windows one under it plus the exact byte count, and when a file passes a limit only under the 1,024 reading, it counts the file as over and says so.

Yes. Sizes come from the file header, not from the browser’s image decoder, so HEIC and HEIF from iPhones, AVIF, TIFF, Photoshop PSD/PSB, JPEG XL and raw files wrapped in TIFF (DNG, CR2, NEF, ARW) are measured even when your browser can’t display them. In that case you get the numbers without a preview. CR3, RAF and ORF raw files aren’t read yet.

An SVG is drawn at whatever size it is placed, but it usually declares a width and height or a viewBox. The image size finder shows those, converted to CSS pixels at 96 per inch when the file uses inches, millimeters or points. If an SVG declares nothing, browsers draw it at 300 × 150, and that is what you’ll see.

Yes. It reports the frame count of animated GIF, WebP and APNG files, along with the canvas size every frame is drawn on.

Many files simply don’t contain one: screenshots, most web images, and JPEGs whose header says “aspect ratio only”. Apps then assume 72 or 96 when asked, but that number isn’t in the file. It doesn’t matter for screens or uploads; for printing, choose the PPI in the print panel.

Resolution is just the pixel count, shown as width × height and megapixels. Whether that is “high” depends on the use: the print table grades it for each paper, and the upload check compares it with a platform’s minimum.

Yes, including animated WebP and AVIF made by phones and image tools. Transparency and, for WebP, animation frame counts are reported too.

Yes. The format line says “transparency” for PNGs with an alpha channel or a transparent palette color, and for WebP, AVIF, HEIC, TIFF and 32-bit BMP files that have one.

Not directly. Right-click the picture in Word or PowerPoint, choose Save as Picture, and measure the saved file. Office often stores a smaller or cropped copy, so measure the original if you still have it.

Yes. Take the screenshot, then press Ctrl+V (⌘+V on a Mac) on this page. On high-density screens a screenshot usually has two or three times as many pixels as the area looked on screen.

A PDF page has no fixed pixel size until it is exported. Export the page as PNG or JPEG at the resolution you need, then put that file in the image size finder.

The DPI number stored in a file doesn’t change its pixels; it only sets the default print size. What matters is pixels per inch on the paper: 300 PPI looks sharp in hand, 200 is good, 150 is the usual floor for prints viewed from a little further away. The print table in the image size finder divides the image’s pixels by the paper size to show the real figure for each common paper.

The pixel size is the same in both. Photoshop’s Image Size dialog also shows a document size in inches or centimeters, worked out from the DPI stored in the file, so a 300 DPI and a 72 DPI copy of the same photo show different inches. The print panel here lets you pick the PPI, which is what decides the printed size.

Look at the 8 × 10 row under the result. It lists the resolution the photo would print at, a Sharp, Good, Fair or Soft grade, and how much would be cropped to fit the shape. The image size finder covers 4 × 6 up to 24 × 36 inches plus Letter, A4 and A3.

If it is, Make a print copy under the table crops it to the 8 × 10 shape without resizing and stores a matching DPI, so apps that read DPI open it at 8 × 10 inches. The copy is saved again as a high-quality JPG (a PNG stays PNG).

Yes. The print panel shows inches, centimeters and millimeters at any PPI: pick 72 to 600 from the list or type any value from 1 to 4,800 under Other…, plus the DPI stored in the file when there is one.

It can check the numbers: type the exact pixel size (or the pixel range and shape) and the file size range from the official instructions into My own limits. It can’t check face position, background color or lighting, which those forms also require.

Yes. Paste the page into the Web page tab, or the image’s own address into the Image link tab. Both report the file’s natural pixel size, which is often much larger than the size the page displays it at.

Yes. Pick YouTube, Instagram, Facebook, X, LinkedIn or Pinterest under “Will it upload?” and the result is checked against that platform’s published size, shape and file-size rules, each linked to the platform’s own help page.

Usually because the file changed on the way. Phones often convert a HEIC photo to JPEG, or shrink it, when it is shared, emailed or picked in a browser, so the copy measured here can be larger or smaller than the one in your gallery. The pixel count tells you whether it was resized.

Yes. Only the header is read, so a 20000-pixel panorama or a 200 MB TIFF is measured as quickly as a small photo. The preview may take longer to draw, but the numbers don’t wait for it.

Yes. When a result misses an upload limit, “Make a copy that fits” lists what it will do: the crop (you choose which part to keep), the new pixel size, the file type and the file-size target. The image size finder makes the copy in your browser, measures the new file again against the same limit, and only then offers the download.

The image size finder won’t enlarge a picture just to reach a recommended size, because enlarging adds no detail. It enlarges only when a hard minimum or an exact size you typed demands it, and says so.

With several images, the Make N copies button under the list copies every image that misses the check and can be fixed, measures each copy again and offers them as one ZIP. Copies that still fail, had to be enlarged, or kept less than half their planned width to meet a size limit stay out of the ZIP unless you tick them; cut-off files aren’t copied at all. Each crop keeps the middle, so make a copy from an image’s own result to choose the part to keep, and make print copies one at a time from each result. On a phone, do very large batches in smaller groups, since every copy is held in memory until you download. An animated GIF keeps only its first frame. My own limits has no file-type choice: PNGs and transparent pictures are saved as PNG (an opaque PNG switches to JPG when that is the only way under a size limit), everything else as JPG. A linked image whose site won’t let other pages read it is fetched through this site’s server instead, up to 4 MB; for bigger ones, save the image and drop the file in. TIFF can be copied only in Safari, and PSD, JPEG XL and camera raw files can’t be copied here, so export a JPG first.

Yes. Pick My own limits and type the Exact width and Exact height. The image size finder crops the picture to that shape (you choose which part stays), scales it to exactly those pixels and checks the new file. For a shape without a fixed size, such as 4:5, use the Shape list instead. A 2 × 2 inch photo at 300 PPI is 600 × 600 px; type 300 in DPI for the copy too, so it prints at 2 × 2 inches. If the exact size is bigger than the picture, it has to be enlarged, which looks softer, and the plan says so before anything is made.

Yes. In the image size finder, pick My own limits, type 100 in Max size (KB), and press Make the copy. The image size finder lowers JPEG quality step by step to the highest setting that fits, and reduces the pixel size only if low quality still isn’t small enough. The new file is measured again, so the KB figure you see is the real one.

Yes. Under each result, pick a platform such as YouTube, Etsy, Amazon or LinkedIn, or type the minimum and maximum width, height and KB from any form.

Open the image, right-click it and choose Copy image address, then paste that into the Image link tab. The server requests only the first 64 KB (more if the header is unusually long). A thumbnail in search results is often a smaller copy than the original on the site it came from. Addresses on private networks, such as 192.168.x.x or localhost, are refused.

Yes. After a Web page scan, images far bigger than the page shows them get a Make smaller versions panel under the list. Each one is resized to twice the shown width (sharp on high-density screens) or the shown width, or to the width its srcset promises, saved at quality 82 as WebP (the default where the browser can save it) or in the original type, and measured again. Files keep the names the page uses, so original-type files can be uploaded over the old ones; WebP files need the HTML updated to the new names. You see the bytes saved per image and in total, and download them as one ZIP. When a version comes out bigger than the original, the other type and lower WebP quality (down to 60) are tried automatically; if none beats the original, it is left out; the page itself doesn’t change until you replace the files on your site.

Only images with a width attribute in the HTML, or a srcset width such as 720w, can be judged, so CSS background images never get a smaller version. The WebP choice appears in browsers that can save WebP (Safari before 17 can’t). A PNG saved again by the browser is compressed less tightly than by image tools and can come out bigger, and an animated GIF keeps only its first frame.

The image size finder reads the page’s HTML as the server sends it. Images that a script adds after the page loads, images inside CSS files, and pages behind a login aren’t in that HTML. Some sites also refuse requests that don’t come from a regular browser; the error then says what the site answered.

Up to 200 files per batch, in a table you can sort by pixels, file size or name. The CSV button saves every row, with shown and stored size, bytes, format, ratio, megapixels and DPI, in a file Excel, Numbers and Google Sheets open directly. The CSV adds print size at the chosen PPI and the upload check with its reasons; it is saved as UTF-8 for Excel. A web page scan measures 60 pictures at a time, with a button for the next 60. A picture with several srcset sizes is one row, its largest size, and smaller sizes that are far wider than they claim are flagged on that row.

Only with a direct link to the image file. A sharing link usually opens a preview page, not the image itself; open the image there, copy its address, and paste that into the Image link tab, or download the file and drop it in.

Yes. Add both (or many) at once and they appear side by side in a table, sortable by pixels or file size, with each one’s full details a click away.

Yes, in current versions of all major browsers on desktop and mobile. Safari also shows previews of HEIC and TIFF files, which Chrome and Firefox can’t display; the numbers are the same in every browser.

Yes to both. It runs in Safari, Chrome and other current mobile browsers, with no account, watermark, daily limit or ads. Some iPhones convert HEIC photos to JPEG when handing them to a website; the image size finder then measures that JPEG, which is also what an upload form on the same phone would receive. There is no browser extension; bookmark the page instead.