Compress Image to 100 KB Online
Reduce any photo or image to exactly 100 KB (or any custom target) in your browser. No upload, no guesswork.
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图片压缩
批量压缩图片到目标大小
上传一张图片或整批图片，设置所需的最大文件大小。免费、私密，在浏览器中运行。
拖放图片到此处
或点击选择文件（PNG、JPG或WebP，一次最多50张，每张最大50MB）
关于图片压缩
我们的图片压缩工具使用多轮自适应压缩，将图片压缩到您需要的大小。设置精确的目标大小，引擎会自动找到质量和大小的最佳平衡——无论是单张图片还是最多50张的批量处理，都会压缩到同一目标大小，并可打包成一个ZIP下载。
功能：
- 设置精确的最大文件大小目标（MB或KB）
- 智能质量搜索的多轮自适应压缩
- 支持PNG、JPG和WebP格式
- 批量模式：一次最多50张（每张50MB以内），可打包为ZIP下载
- 完全在浏览器中运行 — 文件永远不会离开您的设备
- 完全免费，无需注册
使用方法
- 上传图片 — 拖放或点击上传PNG、JPG或WebP图片；批量压缩时可一次选择最多50张（每张最大50MB）。
- 设置目标大小 — 输入所需的最大文件大小（MB或KB）。批量模式下，同一目标大小适用于每张图片。
- 下载压缩后的图片 — 点击「压缩」，等待每张图片处理完成——批量进度会按文件逐一显示。
- 查看结果 — 比较原始文件和压缩后的文件大小。检查压缩率和输出的视觉质量。
- 下载或重试 — 下载压缩后的图片，或将整批结果打包为ZIP下载。也可以调整目标大小后重新压缩以获得不同效果。
常见问题
图片可以压缩多少？
压缩效果取决于图片内容。通常可在保持可接受视觉质量的同时减小50-90%的文件大小。
支持哪些图片格式？
支持PNG、JPG/JPEG和WebP格式，最大可压缩50MB的文件。
目标大小压缩如何工作？
该工具使用二分搜索在不同质量级别之间寻找能适合目标大小的最高质量。它会在多轮中自动调整压缩参数。
有损压缩和无损压缩有什么区别？
有损压缩（JPEG、WebP）会删除部分数据以缩小文件。无损压缩（PNG）保留所有数据。本工具会找到画质与文件大小的最佳平衡。
图片压缩会将文件上传到服务器吗？
不会。所有处理完全在浏览器中完成。文件永远不会离开您的设备，确保完全的隐私和安全。
可以同时压缩多张图片吗？
可以。拖入或选择最多50张图片（每张50MB以内），它们会逐张压缩到同一目标大小，并显示每个文件的状态。您可以单独下载，也可以打包成ZIP一次性下载。如果某个文件无法达到目标大小，会保留找到的最小版本并加以标注。
Why this matters
Many forms, job portals, and government websites impose strict upload limits — 100 KB is a common threshold for profile photos and document attachments. Manually trial-and-erroring quality settings wastes time. A target-size compressor does the math for you, automatically adjusting quality until the file lands under your limit.
Step by step
- 1Open the Image CompressorDrop in your JPG, PNG, or WebP image.
- 2Set the target to 100 KBType "100" and choose "KB" as the unit.
- 3CompressThe compressor iterates quality settings in your browser until the output is at or below 100 KB.
- 4PreviewCompare the before and after. At 100 KB most photos still look sharp.
- 5DownloadSave the compressed image. The file size is guaranteed under 100 KB.
Frequently asked questions
Can I compress a photo to exactly 100 KB?
The tool targets at or below 100 KB. It may land at 95–100 KB depending on image content — it won't exceed your target.
Will a 100 KB photo still look good?
For typical face photos or simple scenes, yes. A 6 MP photo compressed to 100 KB at 60–70% quality is still clear and sharp enough for web forms and profiles.
Which format compresses best to 100 KB?
JPG is the most efficient for photos at small sizes. WebP is similarly small and slightly better in quality. PNG should only be used if transparency is needed.
Does compressing to a target size upload my image?
No. All compression runs in your browser using JavaScript. Your images never leave your device.
What if the image is already under 100 KB?
The compressor will leave it unchanged — or apply minimal compression. You'll see the original file size in the preview.
I need to compress to 200 KB, 500 KB, or 1 MB — can I?
Yes. The target size field is fully customizable. Enter any value in KB or MB.
Further reading
- JPG vs PNG: Which Image Format Should You Use?JPG and PNG are the two most common image formats on the web, but they serve very different purposes. Learn which one to use for photos, logos, screenshots, and more.
- What Is WebP and Should You Use It?WebP is a modern image format from Google that delivers smaller files than JPG or PNG with comparable quality. Here is everything you need to know before switching.
- How to Compress Images Without Losing QualityLarge image files slow down websites and fill up storage. This guide explains the practical techniques for making images smaller while keeping them looking sharp.
You might also need
- Compress Image to 20 KB — Passport & Visa PhotosReduce a photo to under 20 KB for online passport, visa, and government applications — without uploading sensitive identity photos to any server.
- Compress JPG Images Online — Free & PrivateReduce the file size of JPG and JPEG photos right in your browser. Drop in any JPEG, pick your target size, and download the compressed image. Nothing is uploaded to a server.
- Compress PNG Online — Lossless & LossyShrink PNG files in your browser without losing transparency or quality. Perfect for screenshots, app icons, and graphics destined for the web.