Image Compressor
Image Tools
Compress JPEG, PNG, and WebP images right in your browser. Tune quality and maximum dimensions; see before/after byte counts with percentage savings.
Runs entirely in your browserAbout Image Compressor
Image compression is the single biggest win for page weight on most websites. A naive 4MB photo from a phone often compresses to 200KB with imperceptible quality loss — that's a 95% size reduction, and a much faster page. This compressor runs the same modern pipeline behind many open-source image tools, with one important difference: everything happens in your browser. No uploading to a third-party server, no privacy concerns, no per-file limits.
The compressor uses a Web Worker so the main UI thread stays responsive even on large files. Quality (the JPEG/WebP encoder parameter, 20–100%) and maximum dimension (downscale very large images so they don't waste bytes at presentation size) are the two levers; both can be adjusted and the file recompresses instantly. A side-by-side preview shows visual quality before and after, and a stats badge calculates exact byte savings. Format is preserved (JPG stays JPG, PNG stays PNG, etc.) — for cross-format conversion use the dedicated converter tools.
How to use
- 1
Drop your image
Drag an image into the drop zone, or click to pick a file.
- 2
Adjust quality
Use the Quality slider (20–100%). For photos, 70–85% usually gives a great size/quality trade-off. For screenshots with crisp lines, go higher (85–95%).
- 3
Set max dimension if needed
Use the Max width/height slider to downscale very large photos. There's no point shipping a 6000px image if it's displayed at 1200px.
- 4
Re-compress and compare
Click Re-compress to apply new settings. The right preview shows the compressed output and the % savings badge.
- 5
Download
Click Download to save the compressed file (suffixed `-compressed`).
Examples
Phone photo at 85% quality, max 1920px
A typical phone photo (~4MB) compresses to ~200–400KB with no visible quality loss.
Output
4.1 MB → 280 KB (93% smaller)Frequently asked questions
Will the compressed image lose quality?+
Lossy formats (JPEG, WebP) always lose some information, but at 70–85% quality the difference is rarely visible to the eye. PNG compression is lossless — only the encoding is more efficient.
Are my images really not uploaded?+
Confirmed: open DevTools and watch the Network tab while compressing. There are zero network requests. Compression runs in a Web Worker in your browser.
Why does the result look the same but smaller?+
Modern image formats are remarkably good at storing visual information. Reducing the quality parameter removes data the human eye doesn't notice — high-frequency details and subtle color variations.
How big a file can I compress?+
Tens of megabytes work fine on a modern laptop. Above 50MB the browser may stall while loading the file into memory. For very large files, downscale first using the Resize tool.
Why doesn't it support animated GIFs?+
The browser's image APIs only handle the first frame. For GIF compression you need a dedicated tool that understands the frame format — we don't currently ship one.
Related tools
JPG to PNG Converter
Convert JPG images to PNG with optional transparent backgrounds.
PNG to JPG Converter
Convert PNG images to JPG with a configurable background fill.
WebP Converter
Convert images to and from WebP with quality control.
Image Resize
Resize images to exact dimensions or by scale percentage.
Image Crop
Crop images with free or preset aspect ratios (1:1, 4:3, 16:9).