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Bulk Image Resize

Resize multiple images to the same dimensions in one click. All processed locally in your browser.

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Drop multiple images here

PNG, JPG, WebP · All resized to the same dimensions

Batch Resize Images Online

Add as many images as you need, set target dimensions, and click Resize All. Each resized image downloads automatically. Lock ratio keeps proportions correct for all images.

Frequently Asked Questions

Do all images get the same output size?

Yes — all images are resized to the same width and height.

Are images uploaded?

No. Canvas API processes everything locally.

Is there a limit?

No — depends on browser memory.

Related Tools

Bulk resize: which width should you pick?

For a bulk resize, pick the width you need in the W field and keep Lock ratio on. Every image you added gets that width, and the height follows the shape of the photos. This works well when all your files share the same shape.

Example with 6000 × 4000 photos

These photos have a 3:2 ratio (6000 ÷ 4000 = 1.5). The table shows what happens at three target widths. The original has 24,000,000 pixels (6000 × 4000).

Width (W)	Height (H)	Pixels	Share of original
1800	1200	2,160,000	9 %
1500	1000	1,500,000	6.25 %
900	600	540,000	2.25 %

Each height is the width divided by 1.5. For example, 1800 ÷ 1.5 = 1200.

Tips for a clean batch

Test with a small batch first. Click Choose Images, add three or four files, then click Resize All. Check the results before you add the rest with + Add More.
Pick a width that gives a whole number. With a 3:2 photo, widths such as 900, 1500 or 1800 give whole heights. A width of 800 would give 533.33, which has to be rounded.
Match the format to the content. Use JPG for photos, PNG for screenshots or transparent images, and WebP for websites.
Do not mix shapes. If a batch contains 3:2 photos and square images, the tool still applies one width and one height to all of them. Run one batch per shape.
Stay below the original width. If your smallest file is 800 pixels wide, a target of 1500 will only make it blurry.

Common mistake

Typing a new height after the width breaks the ratio. Lock ratio is there to prevent this. Change H by hand only when you want a different shape on purpose.

My resized images are still too heavy. What can I do?

Lower the width and height first, because fewer pixels usually means a lighter file. You can also try JPG or WebP as the output format for photos. If the files are still too big, run them through the Compress Image tool listed in Related Tools.

How to bulk resize images online, step by step

A bulk image resizer changes the size of many pictures in one pass, so you do not have to open each file by hand. This tool applies one width and one height to every image you add. Use it when you need a set of photos to share the same dimensions, or when you want to reduce their pixel size before uploading or emailing them.

Steps

Click Choose Images or drop your files in the drop zone. Use + Add More if you forgot some.
Enter the target width in the W field. If Lock ratio is on, the height updates by itself.
Check the height. Change it only if you really want a different shape.
Pick the output format: JPG, PNG or WebP.
Click Resize All and wait until the process is finished.
Open the downloaded files and check a few of them before you delete the originals.

A worked example

You have photos of 4000 × 3000 pixels and you want them at 1200 pixels wide for a blog.

The ratio is 4000 ÷ 3000 = 4:3.
With the width at 1200, the height is 1200 × 3 ÷ 4 = 900.
Each output image is 1200 × 900 pixels.
The pixel count goes from 12,000,000 (4000 × 3000) to 1,080,000 (1200 × 900). That is 9 % of the original, or about 11 times fewer pixels.

Fewer pixels usually means a smaller file, although the exact weight also depends on the format and on the picture itself.

Practical tips

Group images by shape. All files get the same width and height. If you mix landscape and portrait photos, some will look stretched. Process each group in a separate batch.
Keep the ratio locked when your files share the same shape. It avoids distorted faces and circles.
Choose JPG for photos. Choose PNG for screenshots, logos or images with transparency. WebP is a good option for websites.
Do not enlarge small images. Making a 500-pixel picture 1500 pixels wide only adds blur.
Keep your originals. A resized file cannot get back the detail that was removed.

Common uses

Product photos for an online shop that need identical dimensions.
Photos for a blog or a gallery that must fit a fixed layout.
Pictures that are too large for an email or a form upload.
A set of thumbnails for a presentation or a document.

Questions

Can I resize by a percentage instead of exact pixels?

Not directly. You enter pixel values. To halve an image, divide its width by 2 and type the result. For a 4000-pixel-wide photo, enter 2000.

Why do my images look stretched after resizing?

The target shape probably differs from the original shape. For example, forcing a 4:3 photo into a square changes its proportions. Turn on Lock ratio, or group your images by orientation and run separate batches.

Which format should I pick to get lighter files?

For photos, JPG or WebP usually give smaller files than PNG. PNG keeps sharp edges and transparency, but it is often heavier for photographs. Try one image first and compare the file sizes before you process the whole batch.