Resize an Image to the Right Dimensions
Change image resolution by pixels or percentage
Resize an image by entering pixel dimensions or a percentage. Lock the aspect ratio to keep the photo in proportion: a 1200×800px image becomes 600×400px at 50%. Check the live preview when changing the size or scaling method. Resizing changes the number of pixels; it does not crop away the edges or recover detail that was absent from the original.
Cost: Free to use. File size and usage limits apply.
- Input
- 1200×800px image
- Setting
- Scale to 50% · keep aspect ratio
- Output
- 600×400px image
Half the width and height means one quarter of the pixels. The file size does not necessarily fall by the same proportion.
How to resize a photo
Add your image
Click Upload an image to resize or drop the file onto the tool. JPG, PNG, WebP, GIF, BMP, ICO, TIFF, TGA, AVIF, HEIC and HEIF files up to 200 MB are accepted. Files also lists images you uploaded or created in the other image tools. The line under the preview shows the current size in px and the file size.
Choose the new size
In the Size panel, pick Pixels and change Width or Height or click a preset, or pick Percent and drag the Scaling slider. The panel header shows your target, for example
1080x810or50%.Keep or change the resize method
Lanczos quality is preselected under Resize Method and suits most photos.
Resize, compare and download
Click Resize Image!, drag the slider across the preview to compare original and result, check the new file size under the preview, then click Download. Clear result shows the original again. Each run starts from the original upload, not from the previous result, so trying several sizes doesn't add up quality loss.
Settings explained
- Pixels and Percent
- Pixels resizes to exactly the two numbers in the fields. Percent multiplies the original width and height by the same factor and rounds to whole pixels, so the proportions never change.
- Width and Height
- Values in px. Both fields start at the size of the selected image and reset when you select a different one. You can shrink or enlarge; each side of the result can be up to 8192 px. Larger values stop the job with a message that the output dimensions are too large.
- Padlock (aspect ratio)
- Closed by default. While it is closed, typing a width recalculates the height from the original proportions, and the other way round. Open, both fields are independent, and a width and height with a different ratio stretch or squeeze the picture.
- Presets
- HD 1280 × 720 px, Square 1080 × 1080 px, Story 1080 × 1920 px, Avatar 512 × 512 px, 4K 3840 × 2160 px and Email 800 × 600 px. A preset fills in both fields exactly, even with the padlock closed. An image with a different shape is stretched to the preset, so crop it to the same ratio first with Crop Image.
- Scaling
- Only in Percent mode: 1–300 %, starting at 75 %. 50 % halves both sides, 200 % doubles them. Because of the 8192 px limit, 300 % works only for images up to 2730 px on the longest side.
- Resize Method
- Decides how new pixels are calculated from the old ones. Lanczos quality (default) can keep photo edges defined when shrinking, but can leave faint fringes along hard edges such as text in screenshots. Bicubic smooth is a little softer with fewer fringes, Bilinear balanced softer again, and Fast bilinear is quicker but less exact. Compare the result on your own image. All four blend neighbouring pixels, so enlarged pixel art loses its hard, blocky edges.
What happens to each file format
The result keeps the format of your original, except HEIC and HEIF. This tool has no output format or quality setting; use Convert Image when you need a different format.
JPG
Saved again as JPG with standard compression. Reducing the pixel dimensions can reduce file size, but a heavily compressed original can produce a larger file after re-encoding. The result depends on the photo and the new compression; compare the actual bytes.
PNG
Stays PNG without adding lossy compression. Resizing still recalculates the pixels, so reducing the image does not preserve all its original detail. Transparent areas stay transparent.
Static WebP and AVIF
A still image is re-encoded with high-quality lossy compression, even if the original WebP was lossless. Transparent areas stay transparent.
GIF and animated WebP
Animations keep every frame and their timing. GIF results use the format's palette of up to 256 colours.
HEIC and HEIF
Saved as PNG, because the server can read these formats but not write them; the sidebar tells you before you start. The lossless PNG may be larger than the HEIC or HEIF original; compare the actual file sizes.
ICO
Stays an ICO file with one icon size of up to 256 × 256 px, the largest size the ICO format holds.
Worked example: a 4:3 photo and a square target
A 4000 × 3000 px photo has a 4:3 ratio. With the padlock closed, typing 1080 into Width gives 1080 × 810 px; Percent at 27 % gives the same. Clicking Square instead sets 1080 × 1080 px: the width shrinks to 27 % but the height only to 36 %, so everything looks a third taller than it should.
For a square without distortion, crop the photo to 3000 × 3000 px first, select the cropped image under Files, then click Square. Both sides now shrink to 36 % and nothing is stretched.
Formats and limits
- Input formats
- JPG, PNG, WebP, GIF, BMP, ICO, TIFF, TGA, AVIF, HEIC, HEIF
- Output format
- Same as the input; HEIC and HEIF are saved as PNG
- Maximum file size
- 200 MB per image
- Images per job
- One. If you drop several, all of them are added to Files and you resize them one at a time
- Largest result
- 8192 px per side (ICO: 256 × 256 px)
- Processing
- On our servers with FFmpeg and ImageMagick; no external or AI service receives the file
- Time limit
- 15 minutes per job
- Metadata
- EXIF data such as camera model and GPS location is not copied to the result
- Watermark
- None
- Storage
- Deleted automatically after 48 hours for guests and after 30 days with a free account; paid plans can keep files longer
Frequently asked questions
Why is my resized image bigger in MB than the original?
Usually for one of two reasons: you enlarged it, which adds pixels, or the original was a heavily compressed JPG, which is re-encoded with less compression. If a small file is the goal, run the result through Compress Image, which has quality and format controls.
Does enlarging a picture make it sharper?
No. Enlarging only calculates in-between pixels from the ones that exist, so a 600 px image enlarged to 1800 px looks soft at full size. AI Upscale uses AI models that add plausible detail and is the better choice when a small photo has to get bigger.
Does resizing change the DPI of my image?
There is no DPI setting. The tool changes the number of pixels and doesn't carry the DPI value over from the original, so other programs show their own default DPI for the result. For prints, pixels per printed inch are what count: at the common rule of thumb of 300 DPI, a 4 × 6 in print needs 1200 × 1800 px.
How do I change the picture size without stretching it?
Keep the padlock closed and type only one side, or use Percent. Stretching only happens when width and height end up with a different ratio from the original, for example after opening the padlock or clicking Square for a landscape photo.
Can I resize several photos at once?
Each job resizes one image, but you can drop several at once and they all appear under Files. Select each one and click Resize Image!. Scaling and the resize method stay set when you switch images, while Width and Height reset, so Percent mode is the quickest way to give a set of photos the same scale.
Is my photo uploaded to a server?
Yes. Resizing runs on our servers, not in your browser, and no external service receives the file. Uploads and results are deleted automatically after 48 hours for guests and after 30 days with a free account; paid plans can keep files longer.