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How to resize photos for email, upload forms and the web

Last updated: 4 November 2026

A single photo from a modern phone is often 4000 pixels wide and 3–6 MB in size. That is great for printing a poster, but far more than an email, a web page or an upload form needs. Large photos fill up mailboxes, load slowly and get rejected by forms with a size limit. Resizing them is the most effective way to make them smaller, often without any difference you can see.

Pixels and megabytes are not the same thing

Two different numbers describe an image:

  • Dimensions are the width and height in pixels, such as 4032 × 3024. They decide how much detail the picture holds.
  • File size is the number of megabytes. It depends on the dimensions, the format (JPG, PNG, WebP) and the compression.

Halving the width and height leaves a quarter of the pixels, so the file usually becomes three to four times smaller. That is why resizing works so much better than turning down the quality alone.

Which size to use

UseLong side
Email and messaging1600 px
Website images, full width1600–2000 px
Images inside a blog post1000–1200 px
Profile pictures400–800 px
Upload forms with a 1–2 MB limit1600–2000 px as JPG

These are practical starting points, not rules. If a site or form states its own size, use that.

How to resize a photo

With the image resizer:

  1. Add your images with Choose files, drag them in, or paste a screenshot.
  2. Choose Percentage, Width or Height and type the size. The other side follows automatically, so the picture is never stretched.
  3. Download each image, or all of them in one ZIP file.

A phone photo resized to 25–50% is usually plenty for email and the web. Every image gets the same setting, so you can resize a whole holiday album in one go. The resizing happens in your browser, and your photos are not uploaded.

Will the photo look worse?

Not when you make it smaller for a screen. A laptop display shows roughly 1500–2500 pixels across, so a 4000-pixel photo is scaled down by the viewer anyway. Resizing it yourself just removes detail that nobody would see.

Making an image larger is different: it cannot add detail that was never captured, and the result looks soft. Keep your originals, and resize copies.

A privacy bonus

Phone photos carry hidden details such as the date, the camera model and often the exact GPS location where they were taken. Resized images from FormatYeti contain only the picture, without this EXIF information, which makes them safer to post or send to strangers.

When resizing is not enough

  • Large PNG photos: PNG is lossless and makes photos huge. Convert them with PNG to JPG for files several times smaller.
  • Images for your own website: after resizing, convert them with JPG to WebP. WebP is typically a quarter to a third smaller than JPG at the same quality. See What is a WebP file?
  • Photos inside a PDF: resize them before you create the PDF; see how to combine photos into one PDF.

Tools used in this guide

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