Compress Image Online

Drop your JPG, PNG, or WebP into this free image compressor, then nudge the quality slider until the before/after preview still looks identical to your eye — for most photos that's around 70–85%. Lossy formats discard high-frequency detail the human eye barely registers, so you can compress image online and cut 80–90% of the file size with no visible difference. PNG compression is lossless, so quality is preserved exactly while the encoding gets more efficient.

Yes. There is no account, no email gate, no daily quota, no upgrade upsell, and no watermark stamped on your output. The image compressor loads once and runs entirely in your browser, so the only resource cost is your own CPU. You can compress a thousand images in a row, or open multiple tabs side by side, and nothing on our end notices or rate-limits you. There are also no ads injected into the page or your downloaded file.

Everything is compressed in your browser — there is no upload. Open DevTools and watch the Network tab while you compress an image: you'll see zero network requests. Compression runs in a Web Worker on your device using the browser's native image encoders. This is why teams use this tool for sensitive material like ID scans, medical images, and unreleased product shots that must never be transmitted to a third-party server — unlike TinyPNG or iLoveIMG, which upload your files to compress them.

It depends on the source. When you compress image online here, phone photos and camera JPEGs typically shrink 80–93% at 80% quality with no visible loss, because cameras save at very high bitrates. Already-optimized web images compress less. PNG screenshots vary: flat UI shots shrink a lot, photo-heavy PNGs less. Combining the quality slider with max-dimension downscaling gives the biggest reduction in image file size — a 6000px photo downscaled to 1920px and compressed to 80% often drops by 95% or more.

TinyPNG and iLoveIMG upload your files to their servers to compress them, then send the result back — fast, but your images leave your device. Squoosh, like this tool, runs entirely client-side and is excellent for codec experimentation. This compressor sits in the same privacy-first camp as Squoosh: free, browser-based, no upload, no signup, no watermark — with a simpler two-slider workflow aimed at getting a good result in one pass rather than fine-tuning codecs.

Yes to all three, and the format is always preserved: JPG stays JPG, PNG stays PNG, WebP stays WebP. JPEG and WebP use lossy compression controlled by the quality slider, while PNG is re-encoded losslessly. If you actually want to change formats — say, convert a PNG to JPG to save more space, or a JPG to WebP — use the dedicated JPG to PNG, PNG to JPG, or WebP Converter tools instead.

Lossy compression (JPEG, WebP) permanently discards some image data — usually high-frequency detail and subtle color variations the eye doesn't notice — to achieve much smaller files. Lossless compression (PNG) reorganizes the data more efficiently without throwing any away, so the decompressed image is pixel-identical to the original. Use lossy for photos where small visual sacrifices are invisible, and lossless for screenshots, logos, line art, or anything with sharp edges and text.

For photographs, 70–85% quality is the sweet spot — big savings, no visible loss. For screenshots, UI mockups, or anything with crisp text and hard edges, push to 85–95% because lossy compression tends to smear fine lines and produce halos around text at lower settings. The fastest approach is to watch the live before/after preview and drop the slider until you can just barely notice a difference, then nudge it back up one step.

Tens of megabytes work smoothly on a modern laptop. Above roughly 50 MB the browser may briefly stall while loading the file into memory, since the whole image has to be decoded at once. For very large source files, downscale first with the max-dimension control (or the dedicated Image Resize tool) before compressing — that reduces the in-memory footprint and the final file size at the same time.

The browser's built-in image APIs only expose the first frame of an animated GIF, so a general-purpose compressor can't preserve the animation. Proper GIF compression requires a tool that understands the multi-frame format and inter-frame delta encoding, which is a different pipeline. We don't currently ship one. For animation, consider converting to a video format or a modern animated WebP using a dedicated tool.

The tool is optimized for one image at a time so you can dial in the quality with a live preview and verify the result before downloading. For a folder of similar photos, the practical workflow is to find the right quality setting on one representative image, then run the rest through quickly at that setting. A dedicated batch queue is on the roadmap; in the meantime, single-image mode keeps the preview accurate.

By default it only changes the file size — the pixel dimensions stay the same and just the encoding gets more efficient. Dimensions change only if you deliberately set a max width/height to downscale the image. That separation is intentional: the quality slider controls bytes-per-pixel, and the max-dimension control changes the pixel count. Used together they give the biggest reduction, but you're always in control of which one applies.