Guide to Image Compression: JPEG, PNG, and WebP
Save a photo as PNG instead of JPEG and the file can be 10x larger for identical visual quality. Save a logo as JPEG and you'll get a blurry halo around every edge. The format you choose matters as much as the compression level.
Here's how to choose correctly, every time.
The One-Sentence Rule for Each Format
JPEG — photographs with continuous color gradients.
PNG — anything with transparency, sharp edges, or text on a solid background.
WebP — everything else, when browser compatibility allows.
That's the decision tree. Now here's why.
JPEG: Lossy Compression Done Right
JPEG works by averaging out similar neighboring pixels. In a sunset photo with gradual color transitions, this is invisible — a 5 MB raw photo becomes 200 KB with no perceptible quality loss.
Where JPEG fails: sharp contrast. Black text on a white background, logos, UI screenshots — JPEG introduces a visible "ringing" artifact around hard edges. The algorithm tries to blend what shouldn't be blended.
Use JPEG for: hero images, product photography, blog post photos, anything primarily photographic.
Avoid JPEG for: logos, screenshots, images with text, anything needing transparency.
PNG: Lossless but Expensive
PNG stores every pixel exactly as it is — no data loss, no artifacts. This makes it ideal for graphics where precision matters.
The cost: file sizes are significantly larger than JPEG for the same image. A photograph saved as PNG is typically 5–10x larger than the same photo in JPEG. Never use PNG for photography unless transparency is required.
Use PNG for: logos, UI assets, screenshots, digital art, anything needing a transparent background.
Avoid PNG for: photographs, large hero images, anything that doesn't need transparency.
WebP: The Clear Winner for Web Use
Google developed WebP specifically to replace both JPEG and PNG on the web. It supports:
- Lossy compression (like JPEG) — but 25–35% smaller at equivalent quality
- Lossless compression (like PNG) — but ~26% smaller
- Transparency (like PNG)
Browser support is now universal — Chrome, Safari, Firefox, Edge, and all modern mobile browsers handle WebP natively.
If you're building a website, WebP should be your default output format. The Image Compressor exports directly to WebP alongside JPEG and PNG.
The Quick Comparison
| Format | Compression | Transparency | Best For | Avoid For | |---|---|---|---|---| | JPEG | Lossy | No | Photos | Logos, text, UI | | PNG | Lossless | Yes | Graphics, logos | Photos | | WebP | Both | Yes | Everything web | Legacy systems |
What About SVG?
SVG (Scalable Vector Graphics) isn't a photo format — it's code. SVG files describe shapes mathematically rather than storing pixels. This means they scale to any size with zero quality loss and zero file size increase.
Use SVG for icons and simple logos. Avoid it for anything photographic. An SVG of a sunset doesn't make sense — SVGs work for geometric shapes, not continuous tone imagery.
The Practical Workflow
- Photograph? → Compress as JPEG or WebP via Image Compressor
- Logo or graphic with transparency? → Export as PNG or WebP
- Publishing to the web? → WebP first, JPEG/PNG as fallback
The right format chosen before compression is worth more than aggressive compression applied to the wrong format.
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