Image Resizer
Exact pixel or print sizes, social presets, crop or pad to fit — in your browser.
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Use Actual pixels to inspect fine detail at 100% — both sides scroll together.
HEIC photos open here only in Safari 17 or later. To resize them in this browser, first convert them with the HEIC to JPG Converter — it works in any browser, and nothing is uploaded — then add the JPGs here.
About the Image Resizer
Resize one photo or a hundred to an exact size. Type a width and height in pixels — or in centimetres, millimetres or inches at the DPI you choose, for prints and ID photos — scale by a percentage, or pick a preset for Instagram, Facebook, YouTube, passport photos and common screen sizes.
When the new shape differs from the original you decide how it fits: crop to fill the frame (choosing which part to keep), fit with padding in a colour of your choice (or transparent, for PNG and WebP), or stretch. Large reductions are done in several high-quality steps, so text and fine detail stay crisp instead of jagged.
How to use it
- Drop images onto the box, click Choose images, or paste with Ctrl/⌘ + V.
- Choose Resize by: Size (type a width and/or height), Percentage, or Preset.
- With Keep aspect ratio on, enter just one side and the other follows each image’s proportions. Turn it off (or use a preset) to get an exact width × height, then choose Crop to fill, Fit with padding or Stretch.
- Pick the output format and quality, check the new sizes in the list, then download each image or Download all as a ZIP.
Examples
4032 × 3024 photo · Preset: Instagram post, portrait (4:5) · Crop to fill, centre
1080 × 1350 px — the left and right edges are trimmed so nothing is distorted.
Preset: Passport photo 35 × 45 mm at 300 DPI · Crop to fill, top
413 × 531 px JPG with 300 DPI written in the file, so it prints at 35 × 45 mm.
Crop your photo so the head is centred first if needed — see the Image Cropper.
Percentage: 50% · 6000 × 4000 px
3000 × 2000 px — a quarter of the pixels.
Common uses
- Making photos fit the exact sizes social networks and video platforms use.
- Preparing passport, visa, exam and ID photos at the required print size.
- Shrinking large camera photos for websites, presentations and email.
- Changing only the DPI of a photo for printing (Percentage 100% plus a DPI value).
- Producing consistent thumbnails for a catalogue or blog in one batch.
Pixels, print size and DPI
Screens only care about pixels. Printers use the DPI (dots per inch) stored in the file to turn pixels into a physical size: inches = pixels ÷ DPI. At 300 DPI — the usual standard for photo prints — a 35 × 45 mm photo needs 413 × 531 pixels and a 2 × 2 inch photo needs 600 × 600.
When you resize in mm, cm or inches, the tool converts to pixels at the DPI you enter and writes that DPI into JPG and PNG files, so print software uses the intended size. To change only the DPI, choose Percentage, keep 100% and enter the DPI. WebP files have no standard DPI field.
Where the preset sizes come from
- Instagram: Meta accepts feed photos 320–1440 px wide with aspect ratios from 4:5 (portrait) to 1.91:1 (landscape) and recommends 9:16 for stories (Instagram Platform docs). The presets use the common 1080 px width.
- Facebook link preview / Open Graph: at least 1200 × 630 px, as close to 1.91:1 as possible (Meta sharing docs).
- Facebook cover: 851 × 315 px loads fastest as an sRGB JPG under 100 KB; covers are shown at 16:9 on computers and 2.4:1 on phones, so keep important content in the middle (Facebook Help).
- YouTube thumbnail: 16:9, minimum 640 px wide; YouTube recommends 3840 × 2160, and uploads from mobile are limited to 2 MB (YouTube Help).
- YouTube banner: 2560 × 1440 px is recommended (especially for TV); uploads must be at least 2048 × 1152 px (16:9) and 6 MB or smaller, with text and logos inside the central 1235 × 338 px area (YouTube Help).
- Passport photos: UK prints are 45 mm high × 35 mm wide (GOV.UK); US passport photos are 2 × 2 inches (U.S. Department of State).
Crop, pad or stretch?
- Crop to fill covers the whole frame and trims what does not fit. Use Position to keep the top (portraits), bottom, left, right or centre.
- Fit with padding shows the whole image and fills the empty bands with the background colour — useful for product photos and square posts. For PNG and WebP you can leave the bands transparent instead, and transparent areas of the image itself stay transparent.
- Stretch forces the exact size and distorts the image if the proportions differ.
- Keep aspect ratio (Size mode) never crops or distorts: each image is scaled to fit the width and/or height you enter.
Limitations
- Images up to 50 megapixels in and out, with at most 16,384 px on a side; up to 100 images per batch.
- Enlarging cannot add detail: upscaled images look softer. Tick Don’t enlarge smaller images to leave them as they are.
- Animated GIF, PNG and WebP files keep only their first frame.
- HEIC photos (the iPhone’s default format) open only where the browser can decode them: Safari 17 or later on iPhone, iPad and Mac. In Chrome, Edge or Firefox on a computer, or on Android, convert them first with the HEIC to JPG Converter — it works in any browser.
- Official photos have more rules than size — head size, background, lighting and expression. Check the requirements of the office you are applying to.
- Resized files are saved without the original metadata (EXIF) and in the sRGB colour space.
Privacy
Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.
Frequently asked questions
How do I resize without stretching or distorting the image?
Keep Keep aspect ratio on and enter only the width or the height. If you need an exact size with a different shape, use Crop to fill or Fit with padding instead of Stretch.
What is a passport photo size in pixels?
At 300 DPI, a 35 × 45 mm photo is 413 × 531 pixels and a 2 × 2 inch photo is 600 × 600 pixels. Both are presets here, and the 300 DPI is written into the file. Always confirm the size required by your country and application.
Does resizing reduce image quality?
Making an image smaller keeps it sharp because it is resampled in high-quality steps. JPG and WebP are re-encoded at the quality you choose (90 by default, which is visually very close to the original). Making an image larger cannot create new detail.
How do I change a photo to 300 DPI?
Choose Resize by → Percentage, keep 100%, and enter 300 in DPI. The pixels stay the same and the JPG or PNG is marked as 300 DPI. To get a specific print size, use Size with cm, mm or inches instead.
Can I resize HEIC photos from an iPhone?
Yes, in Safari 17 or later on an iPhone, iPad or Mac: add them as they are, and they are saved as JPG unless you choose another format. Chrome, Edge and Firefox on a computer, and browsers on Android, cannot open HEIC — convert the photos with the HEIC to JPG Converter first (it works in any browser, and nothing is uploaded), then resize the JPGs here.
Can I resize many images at once?
Yes — add up to 100 images. Every image gets the same settings (with Keep aspect ratio each keeps its own proportions), and Download all saves them as one ZIP file.