How to use it
- Add your images: choose files or a folder, drop them on the page, or paste with Ctrl+V.
- Under Resize by, pick Pixels, Percent, Print size or File size.
- Enter the numbers, or press one of the Common sizes: buttons. In Print size mode the exact pixel result appears under the fields.
- Choose Save as and Quality if you want a different format. After changing anything, press Apply to all again.
- Save each image with Download, or all of them with Download all to get one ZIP file.
Four ways to set the size
Pick the mode that matches what you were told. A website asks for pixels, a print shop asks for centimetres or inches, and an upload form usually asks for kilobytes.
- Pixels: type a Width, a Height or both. Leave one empty (it shows "auto") and it follows the other.
- Percent: Percent of the original size, for example 50 to halve both sides. Handy for a batch of photos with different sizes.
- Print size: width and height in cm, mm or in, plus a DPI. The tool turns them into exact pixels.
- File size: type a number under Smaller than and pick KB or MB. The quality is lowered first; the pixel size only shrinks if that isn't enough.
Keep the proportions, or fill an exact size
With Keep the proportions ticked and both sides filled in, each image is fitted inside that box. Nothing is cut and nothing is distorted, so one side may come out smaller than you typed.
Untick it when you need an exact size. A When the shape changes menu then offers Crop to fill the size (the middle is kept and the edges are cut), Fit inside and add a border (the whole picture, with white bars) and Stretch (distorts).
The Common sizes: buttons fill in both sides and untick Keep the proportions for you, so the result is exactly that size:
| Button | Shape | Typical use |
|---|---|---|
| 1080×1080 | Square, 1:1 | Square posts and profile pictures |
| 1080×1350 | Portrait, 4:5 | Tall feed posts |
| 1080×1920 | Vertical, 9:16 | Full-screen phone pictures |
| 1280×720 | Widescreen, 16:9 (HD) | Video thumbnails, slides |
| 1920×1080 | Widescreen, 16:9 (Full HD) | Desktop wallpapers, presentations |
| 3840×2160 | Widescreen, 16:9 (4K UHD) | Large screens |
| 800×600 | Landscape, 4:3 | Older layouts, listings |
| 600×600 | Square, 1:1 | Small product or avatar images |
Print size and DPI: the maths
Pixels = inches × DPI. For centimetres, divide by 2.54 first (1 inch is exactly 2.54 cm); for millimetres, divide by 25.4. The result is rounded to a whole pixel.
| Print size | At 300 DPI | At 150 DPI |
|---|---|---|
| 4 × 6 in | 1200 × 1800 px | 600 × 900 px |
| 5 × 7 in | 1500 × 2100 px | 750 × 1050 px |
| 10 × 15 cm | 1181 × 1772 px | 591 × 886 px |
| 13 × 18 cm | 1535 × 2126 px | 768 × 1063 px |
| A4 (210 × 297 mm) | 2480 × 3508 px | 1240 × 1754 px |
If the photo has a different shape from the print, the middle is kept and the edges are trimmed, so check that nothing important sits near the edge. Use the DPI your printer or print shop asks for.
Why making images bigger blurs them
Resizing up can't add detail that the camera never captured. The software spreads the existing pixels over a larger area, so edges go soft and small text gets fuzzy.
That's why Allow making images bigger is off in Pixels mode: an image smaller than your numbers keeps its own size. Percent above 100 and Print size always produce the size you asked for, even if that means enlarging. For a sharp print, start from a photo that already has at least the pixels in the table.
Questions
- Does changing the DPI alone make a photo sharper?
- No. DPI only links pixels to a printed size. In Print size mode a higher DPI asks for more pixels, and if the photo doesn't have them, they are made by enlarging, which adds no detail.
- Why didn't my image get bigger?
- In Pixels mode we never enlarge unless you tick Allow making images bigger. Tick it, or use Percent with a value above 100.
- How do I give a batch of photos the same exact size?
- Type both sides, untick Keep the proportions and choose Crop to fill the size or Fit inside and add a border. With the box ticked, photos of different shapes come out at different sizes. To choose what gets cut yourself, use Crop image first.
- What happens to PNG files in File size mode?
- They are saved as JPG, because a lossless PNG can't trade quality for size. For more control over the size limit, use the Image compressor.
- Is the location from my phone kept?
- Not by default: Photo details (EXIF) under More options is set to Remove everything. Pick another option there if you want to keep the date taken and camera.
- Are my photos uploaded?
- No. Resizing runs in your browser and the files stay on your device.