Picovert

Compress Images

Reduce file size while maintaining visual quality

No Data Collection

No database, no accounts. We literally can't see your images.

Blazing Fast

Native browser processing — no upload, no waiting.

100% Free

No limits, no watermarks, no hidden fees. Ever.

No Account Required

Sign in? Never. Just open the tool and use it.

Understanding Image Compression

Lossy vs. lossless compression

Image compression works in two fundamentally different ways. Lossy compression (used by JPG, WebP, and AVIF) permanently discards visual information the human eye is least likely to notice, achieving dramatic size reductions at the cost of some detail. Lossless compression (used by PNG) rewrites the data more efficiently without throwing anything away, so the pixels are reconstructed exactly.

Picovert lets you pick the trade-off that fits your goal. For photographs destined for the web, a lossy format at 70–85% quality is usually invisible to viewers yet 60–80% smaller. For logos, screenshots, or images with sharp text, lossless keeps edges crisp.

How each format compresses

PNG excels at flat color and transparency but produces large files for photos. JPG is the long-standing choice for photographs but has no transparency and shows blocking artifacts at low quality. WebP typically beats JPG by 25–35% at the same visual quality and supports transparency, while AVIF compresses even harder, often halving WebP file sizes on complex images.

If your audience uses modern browsers, converting to WebP or AVIF before compressing yields the smallest files. When you need universal compatibility, JPG remains the safe default.

Choosing the right quality setting

There is no single correct value — it depends on how the image is viewed. Hero banners and full-screen images deserve higher quality (around 85%), while thumbnails and background textures can drop to 60% without anyone noticing. Compress, preview the result, and adjust until the file is as small as it can be while still looking right.

Because Picovert runs entirely in your browser using WebAssembly, every adjustment is processed locally and instantly. Your images are never uploaded to a server, so you can experiment freely with confidential photos and client work.

How to Compress Images Free Online

1

Upload Your Images

Drag and drop images or click to browse. Supports PNG, JPG, WebP, AVIF, and more formats.

2

Adjust Quality

Use the quality slider or presets (Low, Medium, High) to find the right balance between file size and visual quality.

3

Download Compressed Files

Your images are compressed automatically. Download individually or all at once with reduced file sizes.

Frequently Asked Questions

How much can I reduce file size?+
Typically 40-80% reduction depending on the image and quality setting. Photos with lots of detail compress more than simple graphics.
Will compression reduce image quality?+
At medium-high quality settings (70-85%), the difference is virtually imperceptible to the human eye while significantly reducing file size.
Which format compresses best?+
WebP and AVIF offer the best compression ratios. For photos, WebP provides about 30% smaller files than JPEG at equivalent quality.
Can I compress multiple images at once?+
Yes, you can upload and compress up to 20 images simultaneously. All files are processed in parallel for maximum speed.
Does Picovert compress HEIC files from iPhone?+
Yes. Picovert supports HEIC input and converts it to WebP or JPEG while dramatically reducing file size. All processing runs locally in your browser — no server upload required.
Does compressing an image change its dimensions?+
No. Picovert's compressor only reduces file size through quality optimization — it never alters image dimensions or aspect ratio. If you also need to resize, use the Resize tool after compression.