Compress Image
Free, in your browser, no upload, no watermark, no limits.
.jpg, .png, .webp · up to 50 MB
Why use it
Professional image compression, free
Compatible everywhere
JPG, PNG, and WebP. The compressed file works in any program or platform.
100% private
Compression happens in your browser. Your image is never uploaded to any server.
Full quality control
Adjustable quality slider. Preview before and after file size in real time.
Instant
Under 1 second per image. No queues, no waiting, no quantity limits.
How it works
Three steps, no hassle
Upload your image
Drag or select a JPG, PNG, or WebP file. Up to 50 MB. No signup.
Adjust quality
Move the slider to control the size-quality tradeoff. The 75-85 range is the optimal sweet spot for web images.
Download the compressed image
Compare before and after file size in real time. Download with one click, no watermark.
FAQ
Got questions?
Lossy compression permanently discards image data to reduce file size. JPEG uses this method: it discards color and frequency information that the human eye perceives with lower sensitivity. Lossless compression reorganizes data without discarding any, like ZIP for images. PNG uses deflate (lossless), so PNG compression reduces file size much less than JPEG. For web photography, lossy compression at 75-85% quality offers the best size-quality ratio.
Images represent on average 50-70% of total page weight. Google PageSpeed Insights and Core Web Vitals penalize slow pages, especially for LCP (Largest Contentful Paint) — the time it takes for the largest visual element to appear. A 3 MB image compressed to 300 KB loads 10 times faster and can push LCP from 4 seconds down to under 1 second, moving from 'Needs Improvement' to 'Good' in Core Web Vitals.
The JPEG quality parameter ranges from 1 to 100. It is not an absolute quality percentage: it's a factor that controls the quantization table used in the Discrete Cosine Transform (DCT). At quality 100, quantization is minimal and file size is maximum. At quality 50, 8x8 pixel blocks lose significant high-frequency detail and visual artifacts appear. The optimal range for the web is 70-85: imperceptible to the naked eye, with files 5 to 20 times smaller than at quality 100.
For photographic JPEG, going from quality 100 to quality 80 reduces file size by 60-80% with imperceptible difference on screen. For PNG, lossless compression can only achieve 10-30% reduction depending on content. If your PNG has solid colors or text, it compresses more; if it has photographic gradients, less. For maximum compression of transparent images, convert to WebP — it offers 25-35% less size than PNG at the same quality.
EXIF metadata contains information such as camera model, date, GPS location, orientation, and exposure settings. This tool preserves metadata by default. However, many online compressors strip it automatically, saving a few extra kilobytes but losing the EXIF orientation tag — which can cause portrait photos to display rotated 90 degrees in some programs.
Photoshop 'Save for Web' uses the same standard JPEG algorithm as any browser-based compressor. The difference is in advanced options: Photoshop allows progressive optimization, sRGB color space conversion, and granular metadata control. For standard web use, results are 95% equivalent. The advantage of browser-based compression is speed: no need to open Photoshop, and the process takes under 1 second.
Image compression: the technique that improves your website and SEO
TinyPNG charges $25 a month to compress images. Squoosh requires a visit to Google's site. Convertir.ai does it free, with no limits, directly in your browser. Image compression is not a technical luxury — it's the highest-impact optimization you can make on a website. The JPEG algorithm works by applying a Discrete Cosine Transform (DCT) to 8x8 pixel blocks, converting color values into frequency coefficients. High-frequency coefficients (fine details) are discarded according to a quantization table defined by the quality parameter. This process is irreversible, but at quality 75-85% the discarding occurs at frequencies that the human visual system barely perceives.
For PNG, the process is different: PNG uses the deflate algorithm (based on LZ77 + Huffman coding), which is lossless. This means PNG compression only reorganizes data; it never eliminates information. The PNG compression level ranges from 0 to 9 and affects encoding time, not quality. A superior alternative for web images is WebP: Google's format uses predictive compression and block transforms similar to VP8 (video), achieving 25-35% less size than JPEG at the same perceptible visual quality, and 26% less than PNG for lossless images.
The performance impact is direct: according to the HTTP Archive, images represent 51% of the average desktop page weight. Google has included image size and format in its Core Web Vitals signals since 2021. A single unoptimized image can be the sole cause of your LCP exceeding 2.5 seconds — the threshold Google considers 'Good'. Compressing images before publishing is the most effective web optimization practice that requires no code changes.