"Your file is over 8MB" — not again. Slide the quality, watch the size drop in real time, and beat the Discord upload limit. Export JPEG or WebP, free, no watermark, right in your browser.「文件超过 8MB」——别再来了。滑动质量滑块，实时看着体积变小，搞定 Discord 上传限制。导出 JPEG 或 WebP，免费、无水印，在浏览器里完成。
Yes. It is 100% free with no watermark and no sign-up. There is no file-size cap on what you can compress.
是的。完全免费、无水印、无需注册，压缩的文件大小没有上限。
It helps you shrink a large photo or screenshot below 8MB so Discord accepts it in chat. The status turns green when you are under the limit.
它帮你把大图或截图压到 8MB 以下，让 Discord 在聊天里接受上传。低于限制时状态会变绿。
JPEG and WebP are lossy. The quality slider trades size for clarity; at 70-80% most photos look nearly identical at a fraction of the size.
JPEG 和 WebP 是有损格式。质量滑块在体积与清晰度间权衡；70-80% 时大多数照片看起来几乎一样，体积却小很多。
No. Compression happens on your device with Canvas. Your image never leaves your computer, which also keeps it fast.
不会。压缩在你自己的设备上用 Canvas 完成，图片从不离开电脑，所以也很快。
A modern phone camera easily produces a 12MB JPEG, and a retina screenshot saved as a PNG can balloon to 15MB or more because PNG is lossless. Discord, Slack and many chat apps cap free uploads at around 8MB, so that perfect meme screenshot gets rejected with a bland "file too big" message. The usual workaround — send it to a random website that uploads the image to its own server — is slow, watermarked, and a privacy gamble. Our Image Compressor solves it locally: the image is read by your browser, drawn to a canvas, and re-encoded at a quality you choose. Nothing is transmitted, and the size readout updates as you drag the slider, so you stop guessing.
现代手机相机随随便便拍出 12MB 的 JPEG，而 Retina 截图存成 PNG 会膨胀到 15MB 以上，因为 PNG 是无损的。Discord、Slack 和很多聊天应用把免费上传限制在 8MB 左右，于是那张完美的表情包截图被一句平淡的「文件太大」拒绝。常见的绕过办法是发到某个随机网站——那会把图上传到它自己的服务器，又慢又加水印，还是隐私豪赌。我们的图片压缩器在本地解决：图片由浏览器读取、绘制到画布上、按你选的质量重新编码。全程不传输，拖动滑块时大小读数实时更新，你不用再瞎猜。
Most compressors make you export, check the file size, export again, and repeat. We encode the preview in the browser on every slider move, so the "compressed" number and the reduction percentage are already real before you download it. The Discord banner turns green the moment your output fits under 8MB, which removes the guesswork entirely. If you are compressing for a website, smaller images also load faster and rank better; if you are compressing for email, attachments stop bouncing. When the job is cropping rather than shrinking, the Circular Crop tool and the 9-Grid Splitter handle their own jobs without re-uploading anything.
大多数压缩器让你导出、看文件大小、再导出、再重复。我们在每次拖动滑块时都在浏览器里编码预览，所以「压缩后」数字和缩小百分比在你下载前就是真实的。输出一旦低于 8MB，Discord 提示就变绿，彻底去掉猜测。为网站压缩时，小图加载更快、SEO 更好；为邮件压缩时，附件不再被退信。如果任务是裁剪而不是缩小，圆形裁剪和九宫格切图各自处理，同样无需上传。
Because compression is done on your own CPU, there is no upload progress bar, no waiting on a queue, and no server to see your photos. It works on a plane, in a basement, or on a dodgy hotel WiFi. There is no account, no credit card, no "free trial." The same logic runs every tool on this site, which is why a screenshot of something private never has to leave your device to become a meme or a badge.
因为压缩在你自己的 CPU 上完成，没有上传进度条、没有排队、没有服务器看到你的照片。飞机上、地下室里、信号差的酒店 WiFi 都能用。没有账号、没有信用卡、没有「免费试用」。本站每个工具都是这套逻辑，这也是为什么一张私密截图不必离开你的设备就能变成表情包或徽章。
JPEG is the universal format; almost every app, website and chat accepts it. WebP is the modern successor that compresses the same visual to a smaller file — typically 25 to 35 percent smaller at equal quality. The catch is that a few older apps and some printing pipelines still choke on WebP. Rule of thumb: export JPEG when you are unsure, and switch to WebP when you know the destination supports it and you are fighting for every kilobyte. For Discord chat, both work; for embedding on your own site, WebP loads faster and improves perceived performance. The tool lets you toggle format instantly and watch the size number move, so you can compare rather than guess.
JPEG 是通用格式；几乎每个应用、网站和聊天都接受。WebP 是现代继任者，把同样视觉压成更小的文件——同质量下通常再小 25% 到 35%。问题在于少数老旧应用和一些打印管线仍打不开 WebP。经验法则：不确定时导出 JPEG；知道目标支持且每 KB 都要争时切 WebP。Discord 聊天两者都行；嵌到自己网站上，WebP 加载更快、 perceived performance 更好。工具让你瞬间切换格式并看着数字跳动，所以是在比较而不是猜。
It is tempting to drag quality all the way down, but heavy compression creates visible blocky artifacts in skies, gradients and text. A cleaner result is often to keep quality high and reduce the pixel dimensions. A 1600px-wide image is more than enough for Discord, WhatsApp or a web feed, and it looks sharper than a 4000px photo crushed to 60 percent quality. Use the max-dimension slider first, then only touch quality if you are still over 8MB. The live readout shows both strategies side by side, and because the whole thing runs locally you can experiment as much as you like without waiting on a server.
把质量一路拖到底很诱人，但重度压缩会在天空、渐变和文字上留下明显的块状伪影。更干净的做法常常是保持高质量、减小像素尺寸。1600px 宽的图对 Discord、WhatsApp 或网页信息流绰绰有余，而且比压到 60% 质量的 4000px 照片更锐利。先用最大边长滑块，只有仍超 8MB 时再动质量。实时读数把两种策略并排展示；因为全程本地运行，你可以随便实验，不用等服务器。
Most "free" image compressors work by uploading your file to a server, processing it there, and handing you back a download. That means your screenshot — sometimes of a bank page, a private chat, or a work document — crosses the internet and sits on someone else's hard drive. It also means slow uploads, file size caps, waiting in a queue, and an ad that tells you to "upgrade" when you are almost done. Our tool does the math on your own device. The image never leaves your computer, there is no upload progress, no account, and no size cap. The live size readout is computed locally too, so it stays instant even on a huge photo. It is the same reason the tool works on a plane or in a basement with no signal.
大多数「免费」图片压缩器的做法是把你的文件上传到服务器、在那边处理、再把下载给你。这意味着你的截图——有时是银行页面、私聊或工作文档——穿过网络、存在别人硬盘上。还意味着慢上传、文件大小上限、排队等待，以及快做完时弹窗让你「升级」。我们的工具在你自己设备上计算。图片从不离开电脑，没有上传进度、没有账号、没有大小上限。实时大小读数也在本地算，所以即使是超大照片也瞬间响应。这也是它在飞机上或没信号的地下室能用的原因。
Drag your big image above, slide the quality until the banner turns green, and download the compressed file in seconds. Need to split a wide screenshot into a social grid instead? Try the 9-Grid Splitter next.
把大图拖到上方，滑动质量直到提示变绿，几秒钟下载压缩后的文件。想把宽截图切成社交九宫格？接下来试试九宫格切图工具。
