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Image Resizer: Change Width, Height or Percentage

Resize a picture for a form, message or website. Set one side, use a percentage or fit it inside a box without stretching it.

Runs in your browser — your input is not uploaded to ToolsNow.

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Try a smaller version of the practice card

Open the 800 × 600 HEIC card, choose Width and enter 400. Check that Output reads 400 × 300 and the words remain readable after downloading. The PNG card is useful for checking transparent edges.

Follow the worked example →

ToolsNow practice files with fictional details, free to download and reuse.

How to use

  1. Choose images. Open a picture and select it in the file list. Add more images if you want to use the same settings for a batch.
  2. Set Resize by. For a picture no wider than 1,200 pixels, choose Width and enter 1200. Height follows automatically; smaller originals stay small unless Allow enlargement is on.
  3. Check and download. Read the Output dimensions and File size, choose Save as, then download the selected picture or prepare a batch ZIP.

Questions

Which resize option should I use?

Use Width or Height when a destination gives one exact dimension. Fit inside a box keeps both sides below your chosen limits without cutting off the picture. Percentage is useful when you simply want it half as large. Use Crop first if the destination needs a different shape.

Why did a small image stay the same size?

Allow enlargement is off by default. Turn it on if you need more pixels, but expect some softness: making the file larger cannot recover detail missing from the source.

Can I resize a batch?

Yes. Add several pictures, check a few different shapes, then use Prepare all as ZIP and Save ZIP. The current format, resize, crop and rotation settings apply to every file. Review any failed-file messages before assuming the ZIP contains the whole batch.

Does this set the printed size?

It sets pixel dimensions, not a guaranteed size on paper. Ask the printer for the pixels they need and check the print settings separately. Keep the original for colour-critical work or further editing.

What else changes in the saved image?

The result is one flattened still image in 8-bit sRGB. Animation, extra pages and editable layers are not retained. Export strips source profiles and metadata, but this is not a check for every possible identifying detail: filenames and information visible in the picture still matter.

Are my pictures uploaded?

The workspace decodes and edits your files on this device, without uploading them for processing. The image processor downloads from ToolsNow on first use, and the site can make other loading requests. Local processing is not a promise that the page is network-free.

Examples and checks

Check the width and height your destination needs, then choose Width, Height, Percentage or Fit inside a box. The resize modes keep the picture’s proportions.

Fit a wide photo

Input or situation
Original 2400 × 1600 pixels; Width mode set to 1200
Result
1200 × 800 pixels

The height is calculated automatically, keeping the original 3:2 shape.

Before you use the result

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