Compress Images to 1MB

Large image files can be a problem when uploading to websites, sending via email, or sharing on social media. Most platforms have file size limits between 1MB and 5MB. Whether you need to come down to 5MB, 2MB, 1MB, or even smaller, our free image compressor handles it without noticeable quality loss.

The tool re-encodes your image at a starting quality, checks the resulting byte size, and if it's still over your target, steps quality down a notch and — because a large image at any quality can still miss a small target — also scales the pixel dimensions down slightly on each pass, repeating until the output clears your limit or it runs out of passes. Images above 3840px on the long edge are scaled down before compression even starts, since nothing web-sized needs more resolution than that. For PNG files that barely shrink on their own (screenshots and flat-color graphics resist PNG's own compression less than photos do, so this mostly doesn't apply to them), we also try a JPEG re-encode and keep whichever comes out smaller.

All compression runs directly in your browser using Web Workers, so your images are never uploaded anywhere and the UI stays responsive throughout the process.

JPG/JPEG is the right choice for photographs, and most of its size reduction at moderate quality settings comes from chroma subsampling, not from throwing away detail evenly. The JPEG codec splits an image into a brightness (luma) channel and two color (chroma) channels, then stores the color channels at lower resolution — your eyes are far more sensitive to brightness detail than to color detail, so this is close to free in perceived quality. A typical 12MP phone photo shot around 3-4MB at the camera's own ~90% quality will usually re-encode to roughly 600KB-1.2MB at 80% quality with no visible difference, and down to 300-500KB at 60% quality with a barely perceptible softening in fine texture. Below about 40% quality, blocky artifacts start showing up along high-contrast edges (text, hard object boundaries) — that's the point where quality loss becomes visible rather than just theoretical.

This is also why quality reduction is usually the better lever than resizing for a general size target: quality reduction throws away redundant information the eye barely registers, while shrinking pixel dimensions throws away actual content — you lose the ability to zoom in or crop later. That said, this tool doesn't make you choose: above 3840px on the long edge it scales dimensions down automatically before compression even starts (nothing web-sized needs more resolution than that), and on later passes toward a tight target it can reduce both quality and dimensions together. If you specifically need control over the final pixel dimensions rather than just a byte-size target, use the resize tool instead.

PNG is lossless and best for screenshots, logos, and graphics with flat colors or transparency, because its DEFLATE-based compression exploits large runs of identical pixels — something a photo almost never has. PNG photographs are huge (often 2-4x the equivalent JPEG) precisely because photographic noise defeats that run-length advantage. When a PNG doesn't shrink much on its own, the compressor also tries a JPEG re-encode of the same image and keeps whichever comes out smaller — useful for PNG photos, less relevant for genuine flat-color graphics where PNG usually wins anyway.

HEIC/HEIF is the format iPhones shoot in by default since iOS 11. It uses a more modern intra-frame codec (HEVC) than JPEG's decades-old baseline codec, which is why it achieves smaller files at equivalent quality — but that same modernity means many Windows apps, older Android devices, and most browsers (Chrome and Firefox included) still can't decode it. This tool doesn't accept HEIC files directly for that reason. If your photo is HEIC, export or share it as JPEG from your iPhone first (Photos app export options, or the share sheet's "JPEG" choice), then compress the JPEG here — a typical 3-5MB iPhone photo still comes down to a few hundred KB.

Very high-resolution images (large panoramas, scanned film at 50MP+) can take a noticeable moment per encode pass on a low-power device, because canvas re-encoding is single-threaded per image even though the batch itself runs in parallel workers.

There is a practical floor to how small a photo can get before quality collapses — for a busy, high-detail photo, targeting something like 20-30KB usually isn't achievable without visible blocking, no matter how the tool adjusts quality. If your target seems impossible for the content, the tool will still give you its best attempt rather than fail silently, but the result may not be usable.

Animated GIFs opened here are compressed frame-by-frame as a static-color-palette problem, not as video; for large animated GIFs, the dedicated GIF compressor gives you frame-rate and palette controls this general tool doesn't expose.