Reduce image file size without visible quality loss. Compression runs locally in your browser — your image is never uploaded, so it's instant and private.
Shrink image file size without visible quality loss. Auto picks WebP for transparent images and JPEG for photos. Fully local — nothing is uploaded.
Modern codecs waste very few bits at high quality settings. Re-encoding a photo as JPEG or WebP around 80–90% quality typically cuts the file to a fraction of its original size while looking identical at normal viewing sizes. The Auto mode picks WebP when your image has transparency (so the alpha channel survives) and JPEG for regular photos.
Platforms cap upload sizes: YouTube thumbnails must be 2 MB or less, and many forums and CMSs enforce similar limits. Combine the quality slider with a max-dimension cap — a thumbnail displayed at 1280×720 gains nothing from a 6000-pixel source, and downscaling is the single biggest size win.
Server-based compressors spend most of their time transferring your file, and your photo ends up on someone else's machine. This tool re-encodes with your browser's own codecs, so a 20 MB photo compresses in about a second and never leaves your device.
At the default 80% quality, differences are invisible at normal viewing sizes for photos. Pixel-perfect graphics with hard edges keep best fidelity in WebP; drop the quality slider only if you need an aggressively small file.
Yes — Auto mode detects transparency and outputs WebP, which keeps the alpha channel. Choosing JPG flattens transparent areas onto white, since JPEG has no alpha.
No. Compression runs on a canvas in your browser using its built-in codecs. Nothing is sent anywhere.
Downscale first: set a max size that matches how the image will be displayed. Then lower quality until you notice artifacts, and step back up one notch. WebP usually beats JPEG at the same visual quality.