JPG Optimizer

How to optimize a JPG file

Drop your JPG above or click to browse. The tool re-encodes it at 82% quality — visually lossless for most photos but significantly smaller than camera-original or unoptimized JPGs. The result shows the before and after file sizes so you can see exactly how much space you've saved.

Frequently asked questions

How much smaller will my JPG be after optimizing?

Camera JPGs straight from a phone or DSLR are typically saved at 95–100% quality. Re-encoding at 82% reduces file size by 40–70% with no visible difference at normal viewing sizes. A 5 MB phone photo often becomes 1–2 MB.

Will re-compressing a JPG reduce quality?

Technically yes — each JPEG encode/decode cycle introduces minor compression artifacts. At 82% quality the difference is invisible in practice for photographs. Avoid over-optimizing: compress once to your target quality, not repeatedly. If you need truly lossless optimization, use PNG format instead.

What is the best quality setting for web images?

80–85% quality is the standard for web use. This delivers 40–70% smaller files that look identical on screen at normal zoom. Google PageSpeed and Core Web Vitals specifically recommend keeping image quality at 85% or below for web delivery.

Does my JPG file get uploaded anywhere?

No — re-encoding runs entirely in your browser using the Canvas API. Your file never leaves your device.

How is this different from the image compressor?

The image compressor accepts any format (PNG, WebP, GIF) and has an adjustable quality slider. This JPG Optimizer is a focused tool that accepts JPGs and applies a pre-tuned 82% quality setting optimal for photos — one click, no adjustment needed.

Can I batch optimize multiple JPG files?

Yes — drop multiple JPG files and all will be optimized simultaneously.

How do I reduce image dimensions instead of quality?

Use the image resizer to scale down the pixel dimensions. Halving the dimensions reduces file size by about 75% — often more effective than quality compression for very large photos.

What is the difference between a JPG optimizer and a compressor?

A JPG optimizer re-encodes the JPEG at a target quality level to reduce file size, keeping the original pixel dimensions. A compressor may also resize the image — scaling down the pixel dimensions in addition to adjusting quality. This optimizer focuses purely on quality-based re-encoding, so your image stays the same size in pixels. Use the image resizer if you also want to reduce dimensions.

What quality setting should I use?

80–85% is the sweet spot for web images — it delivers a 40–60% file size reduction with no visible quality difference at normal screen sizes. Use 90–95% for professional or print use where fine detail matters. Avoid going below 70% unless extreme size reduction is critical; artifacts become noticeable on photos and severe on images with text or sharp edges.

Can I optimize a JPG without losing quality?

Every JPEG re-encode discards some image data because JPEG is a lossy format. However, at 90% or higher quality the difference is invisible to the human eye even when zoomed in. At the default 82% setting used here, the visual difference is imperceptible for photographs under normal viewing conditions. Only images with text, line art, or flat colors show noticeable artifacts at lower quality settings.

How much smaller will my JPG get?

Camera JPGs are typically saved at 95–100% quality. Re-encoding at 82% produces 40–70% smaller files. As a real-world example, a 3 MB phone photo typically becomes 900 KB–1.8 MB after optimization — still sharp on any screen, but much faster to upload, email, or load on a web page.