How to reduce image file size without ruining quality

Start with the right format

Format choice matters more than any other setting:

• Photos → JPG or WebP
• Graphics and screenshots → PNG or WebP
• Web use → WebP usually beats both

Converting a photo from PNG to JPG alone can cut the file size by 80% with no visible difference.

Use the quality slider

When converting to JPG or WebP on ConvertPics, you get a quality slider. Some guidelines:

• 90%+ — archiving, printing, further editing
• 80% — the sweet spot for most web images
• 60–70% — thumbnails and previews where size matters most

Below 50% you will start to see blocky artefacts, especially in skies and gradients.

Resize before you compress

A 4000-pixel-wide photo displayed at 800 pixels wide is wasting 96% of its data. Resize first, then convert.

A practical workflow

1. Resize the image to the largest size it will actually be displayed at.
2. Convert to JPG or WebP.
3. Set quality to 80% and check the result.
4. Nudge the slider down until you can just notice a difference, then back off one step.

Try it now with the JPG to WebP converter — your files never leave your device.