compressjpeg Compress images

Resize Image

Scale images down to web dimensions for an extra file-size win.

Resize

Drag & drop files here, or

Accepts .jpg, .jpeg, .png, .webp

  1. Upload an image.
  2. It is scaled to a 1920px maximum edge.
  3. Download the resized image.

Resizing reduces the pixel dimensions, which slashes file size on top of compression. This tool caps the longest edge at 1920 pixels — perfect for full-width web display — while keeping the aspect ratio. Combine with JPEG compression for the smallest result.

Why dimensions matter more than you think

File size scales with the number of pixels, and pixels scale with the square of the dimensions. Halve the width and height of an image and you don't remove half the data — you remove roughly three-quarters of it, because the area shrinks fourfold. That is why resizing is often the single largest saving available, ahead of any quality tweak. A 4000-pixel photo dropped into a 1000-pixel column is carrying sixteen times the data the screen can show, and no compressor can fix that without first removing the surplus pixels. This tool caps the longest edge at 1920 pixels, a size that still fills a full-width hero on a high-resolution display while discarding the wasteful excess above it.

Resize first, then compress — the order matters

Sequence changes the outcome. Resize before compressing and the compressor only has to encode the pixels you'll actually display, so it can spend its quality budget where it counts. Compress first and you've optimised pixels you're about to throw away — wasted effort. The reliable pipeline is short:

  • Resize the source down to its display dimensions here.
  • Compress the result with JPEG compression for photos.
  • Convert to WebP if you want the smallest modern delivery.

Each step is one upload, and together they routinely cut a multi-megabyte original to a few hundred kilobytes.

Aspect ratio stays locked, so nothing stretches

Resizing here is uniform: width and height shrink by the same factor, so circles stay round and faces stay natural. You won't get the squashed look that comes from forcing an image into a fixed box of the wrong shape. Because the cap applies to the longest edge, a tall portrait and a wide landscape both end up appropriately sized without you doing any maths. If the image also has redundant bytes after scaling — and it usually does — finish with compression or send graphics through PNG optimisation. The full toolkit on compressjpeg.onl is built to be chained this way.

Guides about Resize Image

Image formats & file size Resize vs Compress: Which One Does Your Image Need? Resizing and compressing solve different problems. This guide explains the difference, shows when to use each, and why combining them gives the smallest files. 5 min read

More compressjpeg tools

Compress JPEG Make JPEG photos dramatically smaller for email, web and uploads — without visible quality loss. Compress PNG Optimise PNG graphics to the smallest lossless size, keeping transparency and crisp edges. Compress to WebP Convert and compress images to WebP — the smallest modern web format.

Frequently asked questions

How is resizing different from compressing?
Resizing reduces the pixel dimensions of an image; compression reduces file size while keeping the same dimensions. Doing both produces the smallest possible file.
Will resizing distort my image?
No. The aspect ratio is preserved, so the image scales uniformly without stretching or squashing in either direction.
Why cap the longest edge at 1920 pixels?
1920 pixels still fills a full-width display on high-resolution screens, while removing the excess pixels that oversized originals waste on file size.
Should I resize before or after compressing?
Resize first. That way the compressor only encodes the pixels you'll actually show, instead of optimising data you're about to discard.