Image compression vs image resizing

Resizing changes pixel count. Compression changes how those pixels are stored. You usually need both for a web hero, in that order: resize, then compress.

Do not compress a 4000-pixel photo and then display it at 800 pixels. Resize to the display size first, then compress. ConvertPass keeps those jobs in separate tools so the controls stay honest.

What changes

Compression. Bits per pixel, artefacts, format.

Resizing. Width and height.

When it helps

Compression. After you already have the right pixel size.

Resizing. When the source is larger than the layout.

When it hurts

Compression. Re-encoding an already small JPEG at ‘quality 100’.

Resizing. Upscaling a tiny asset and expecting sharpness.

Metadata

Compression. Canvas compression strips it.

Resizing. Canvas resize strips it too.

Topic	Compression	Resizing
What changes	Bits per pixel, artefacts, format.	Width and height.
When it helps	After you already have the right pixel size.	When the source is larger than the layout.
When it hurts	Re-encoding an already small JPEG at ‘quality 100’.	Upscaling a tiny asset and expecting sharpness.
Metadata	Canvas compression strips it.	Canvas resize strips it too.

Related tools

Image compressor
Auto-compress locally to the smallest high-quality JPEG, WebP, PNG, or AVIF.
Image resizer
Crop and resize images on-device without a trip through a remote farm.
Image converter
Convert images on-device, with honest limits for animation and AVIF support.

Related formats

Last reviewed 16 August 2026.