Optimize file size
Reduce JPG, PNG, WebP, or AVIF file size locally and compare the result before downloading.
JPG, PNG, WebP, or AVIF · up to 32 MB · adaptive 8–24 megapixel limit
Your image never leaves this browser
Images stay in browser memory and are never uploaded by these tools.
Decode and export JPG, PNG, WebP, and AVIF using browser and WebAssembly codecs.
Re-encoding can alter metadata, animation, profiles, or quality, so verify every output.
Complete tool guide
Make a JPG, PNG, WebP, or AVIF file smaller without changing its width, height, or format. Choose a quality level, compress, and compare the before and after file sizes and the preview before you download. The image is decoded and re-encoded in this browser tab, so it is never uploaded.
Your input is processed in the current browser tab and is not sent to the application server.
Choose or drag in one JPG, PNG, WebP, or AVIF image up to 32 MB.
Set Output quality. 82% is the default and a good starting point for photos; lower values make smaller files.
Select Compress image and compare the Before, Output, and Reduction values with the preview.
If the result looks soft or blocky, raise the quality and compress again. Download when you are happy.
Controls how much detail the lossy JPG, WebP, and AVIF encoders keep. Values around 70–85% usually look very close to the original photo at normal viewing size. Below about 50%, edges, skin tones, and smooth skies start to show blocks, halos, or banding.
Browsers save PNG losslessly, so the quality slider is disabled for PNG sources. A PNG can only get smaller here if the browser’s encoder packs it more efficiently than the original. For big savings on photographic PNGs, convert them to WebP, AVIF, or JPG instead.
Before is the size of your file, Output is the size of the new file, and Reduction is (Before − Output) ÷ Before. The preview shows the actual compressed pixels, on a checkerboard so you can see any transparency.
Start with: IMG_2041.jpg · 4032 × 3024 px · 4.8 MB
IMG_2041-compressed.jpg · 4032 × 3024 px (unchanged) · Reduction = (Before − Output) ÷ BeforeThe pixel size stays the same, so all of the saving comes from the encoder. If the Output reads 1.2 MB, the Reduction card shows (4.8 − 1.2) ÷ 4.8 = 75.0%. The exact saving depends on the photo: busy detail such as foliage compresses less than smooth sky.
Start with: settings-screenshot.png · 1440 × 900 px · already exported by an optimizer
settings-screenshot-compressed.png · same bytes as the original · Reduction 0.0%The browser’s PNG encoder could not beat the existing file, so the original was kept rather than enlarged. For a smaller file, convert the screenshot to WebP in the Image Converter, which keeps text sharp at high quality settings.
The image is decoded to raw pixels and encoded again with the same format. Lossy formats discard fine detail that is hard to see, which is where most of the saving comes from. Width and height do not change; to make the file much smaller, reducing the dimensions with the Image Resizer is often more effective than lowering quality.
Still JPG, PNG, WebP, and AVIF files up to 32 MB and 10,000 pixels per side are supported. The largest image a device can handle depends on its memory: typically 8–24 megapixels. Animated GIF, PNG, WebP, and AVIF files are refused because saving them would keep only one frame. HEIC, TIFF, BMP, and RAW files are not supported.
Browser encoders do not copy EXIF data such as camera model, capture date, or GPS location into the compressed file, so compressing also strips that data. Photos are re-encoded in sRGB; images saved with a wide-gamut profile such as Display P3 may look slightly less saturated.
Yes. There is no account, limit on the number of images, or watermark. Your image is processed in this browser tab and is not uploaded to a server; refreshing the page clears it.
Compress at 82%, check the Output size, then lower the quality in steps of about 10 until it fits. If quality drops too far before you reach the target, reduce the dimensions with the Image Resizer first; halving width and height removes about three quarters of the pixels.
If the new file would be the same size or larger, the tool gives you the original bytes back instead of making the download bigger. This is common for PNG screenshots and images that were already optimized. Try a lower quality, a smaller size, or converting to WebP.
No. Width and height stay exactly the same. Use the Image Resizer when you also need a smaller pixel size.
Not yet. The compressor handles one image at a time so you can check each result before downloading it.
Keep working
Continue with another focused tool from the same collection.