Image Resizer
Resize images in bulk by pixels, percentage or longest side, with fit, fill, pad and stretch modes plus social media presets.
This guide is not yet available in your language and is shown in English.
Tool guide
What this tool does
Image Resizer changes the dimensions of one image or hundreds at once. Set an exact size, a percentage or a maximum longest side, decide how the image should fit the new frame, and download the results individually or as a ZIP.
Every destination wants a different size: 1080 × 1080 for an Instagram square, 1280 × 720 for a YouTube thumbnail, a maximum of 1600 px for a blog, or a 600 × 600 photo for a visa form. Resizing by hand in a desktop editor is slow when you have twenty images and easy to get wrong when the aspect ratio does not match.
This resizer scales images with high-quality, multi-step downsampling: it halves the image repeatedly before the final draw, which avoids the jagged, aliased edges a single large jump produces. When the target shape differs from the photo you choose to fit inside, fill and crop from the centre, pad with a colour, or stretch. All of it happens in your browser.
How to use Image Resizer
- Add images with drag and drop, paste, or the sample button.
- Choose Resize by: Pixels, Percent or Longest side.
- For pixels, pick a Preset or type a Width and Height; leave one empty to keep proportions.
- Select a Fit mode: Fit inside, Fill and crop, Pad to exact size, or Stretch.
- Set the output format and quality, then check the preview.
- Press Resize and download each file or all of them as a ZIP.
Tips for better results
- Use Longest side for mixed portrait and landscape photos; every image gets the same maximum dimension without being cropped.
- Keep Do not enlarge smaller images on: upscaling only makes pixels bigger and cannot add detail.
- Pad to exact size with a white or brand colour is ideal for marketplace listings that require square images without cropping the product.
- Output files are named with their new size, for example photo-1080x1080.jpg, so they are easy to tell apart.
Common use cases
- Preparing a set of product photos at 2000 × 2000 for an online store.
- Making Instagram portrait (1080 × 1350) and Story (1080 × 1920) versions of the same picture.
- Scaling camera photos to 50% before attaching them to a report.
- Meeting the exact pixel size required by an exam or government application form.
Common mistakes to avoid
- Stretching an image to a different aspect ratio, which distorts faces and logos; use Fill and crop or Pad instead.
- Confusing pixel dimensions with file size: a smaller image is usually lighter, but compression controls the KB.
- Resizing a low-resolution image up to a large print size and expecting it to look sharp.
Frequently asked questions
Does resizing reduce quality?
Downscaling discards pixels but, with good resampling, the result looks sharp at its new size. Upscaling cannot invent detail, so it looks soft. JPG and WebP output are also re-compressed at the quality you choose.
What is the difference between Fill and crop and Pad?
Fill and crop scales the image until it covers the whole frame and trims the overflow from the centre. Pad scales it to fit inside and fills the leftover bars with your chosen colour, so nothing is cut off.
Is there a limit on size or number of files?
There is no fixed file count. Browsers cap a canvas at roughly 16,384 px per side and around 120 megapixels in total, so the tool warns you before attempting anything larger.
Are the images uploaded?
No. Resizing uses the canvas in your browser; nothing is sent to a server.
Related articles
Feedback & suggestions
Help us improve Image Resizer. We read every message.