1. The quickest way — compress an image in your browser
- Open the Compress Image tool.
- Drop in your JPG, PNG or WebP (add several to do them all at once).
- Pick a format and drag the quality slider — the new size updates as you go.
- Optionally set a max width to shrink huge photos further.
- Download each image, or all of them as a ZIP.
Everything is processed on your device — your photos are never uploaded.
Compress your images nowFree, in your browser — quality slider, before/after size, no upload.
Open Compress Image →2. Why “without losing quality” is realistic
Photos are full of detail your eye can't fully distinguish. Lossy compression (JPG, WebP) throws away the least-noticeable information first. At high quality (around 80%), the file can be 3–5× smaller while looking identical at normal viewing size. You only start to see softening or blocky “artifacts” when you push quality very low.
3. The two levers: quality and size
- Quality — how much detail to keep. 80% is a great default; 60–70% squeezes harder with minor softening.
- Dimensions — this is the big one people forget. A 6000-pixel-wide photo doesn't need to be that big for a web page or email. Resizing to, say, 1920px wide can shrink the file more than any quality setting — before compression even kicks in.
Combine both and a 9 MB photo routinely drops to a few hundred KB with no visible difference.
4. Getting under a size limit (e.g. 100KB)
Need to hit a strict cap for a form upload or a forum avatar? Lower the quality slider, switch to JPG or WebP, and reduce the width. Because the new size shows live, you can nudge the slider until you're just under the limit instead of guessing.
5. Which format to choose?
| Format | Best for |
|---|---|
| WebP | Smallest files at the same quality — ideal for websites |
| JPG | Photos — great compression, works everywhere |
| PNG | Logos, screenshots, transparency (lossless) |
Need to change format rather than just shrink? Use Convert Image. Want the image inside a document? Image to PDF.
Explore the full free toolkit32 tools that all run in your browser — no upload, no sign-up.
Explore PDFNest →Frequently asked questions
How do I compress an image without losing quality?
Use ~70–80% quality and, for large photos, reduce the dimensions to what you actually need. That cuts size dramatically while keeping it sharp. PDFNest does it in your browser with a live quality slider.
How do I get an image under 100KB?
Lower the quality slider, choose JPG or WebP, and reduce the width — the new size shows live, so adjust until you're under target.
Which format compresses best?
WebP is usually smallest at the same quality, then JPG. PNG is lossless — best for graphics and transparency.
Are my images uploaded?
With PDFNest, no — images are compressed locally in your browser.