Large, uncompressed photos are one of the single most common reasons a website feels slow — and it's an entirely fixable problem in seconds, without touching any code. This compressor re-encodes your image at a quality level you choose, optionally resizing it down from an oversized original first, and does the entire job locally in your browser so nothing you upload is ever sent to a remote server.
Why unoptimized images slow everything down
A photo straight off a modern phone camera is frequently 3–8 megabytes — dramatically larger than it needs to be for on-screen display, where even a full-width hero image rarely needs to exceed 1–2 megabytes to look crisp. That extra weight has to be downloaded by every single visitor, on every single page load, which adds up to real, measurable delay, especially on mobile connections. Compressing images before you publish them is one of the highest-leverage, lowest-effort improvements you can make to a site's actual perceived speed.
How to use it
- Select the image you want to compress.
- Adjust the quality slider — watch the live preview and estimated file size update as you move it.
- Optionally set a maximum width, which resizes oversized images down before compression, useful when the original resolution is far larger than anything the image will actually be displayed at.
- Download the compressed result.
Finding the right quality setting
There's rarely a reason to compress below quality 60 for anything meant to look good — visible artifacts (blurry edges, blocky patches in gradients) start appearing below that point on most images. A setting between 70 and 85 typically produces a file 60–80% smaller than the uncompressed original with no visible loss in normal browsing conditions. Photos with lots of fine detail (foliage, fabric texture, complex patterns) tolerate compression less gracefully than simple, smooth images and may need a slightly higher setting to avoid visible artifacts.
Resizing versus compressing
These solve different problems and are often best used together. Compression reduces file size at a given resolution by discarding redundant visual information. Resizing reduces the actual pixel dimensions — useful when an image is simply larger than it will ever be displayed at, which is extremely common with camera-straight-out photos being used as small thumbnails. Resizing a 4000px-wide photo down to 800px before compressing it typically produces a far smaller file, at equal visual quality, than compression alone ever could.
Where this matters most
- Blog and content sites — every article's hero and inline images benefit directly from smaller file sizes.
- Online stores — product galleries with dozens of images compound the savings dramatically across a whole catalog.
- Portfolios — photographers and designers can compress a full gallery in minutes rather than manually re-exporting from design software.
- Social media prep — many platforms recompress uploads anyway, so pre-compressing gives you more control over the final visual result than letting the platform do it for you.
Frequently asked questions
Does compressing an image degrade it permanently? Only the exported copy is affected — always keep your original uncompressed file, and compress a copy for web use.
What's a safe quality setting for most photos? 75–80 is a reliable starting point for photographic images; simpler graphics and illustrations can often go lower without visible loss.
Is this tool private? Yes — everything happens locally in your browser tab. Nothing is uploaded to any server.
Can I batch-compress multiple images at once? This tool processes one image at a time for full control over each file's settings; for very large batches, compress your most-viewed images first for the biggest impact.