Compress Image to 400 KB
Shrink a JPG, PNG, or WebP photo down to about 400 KB right in your browser — ideal for high-quality web images where you still want a smaller file. The target is preset; just add your image and download.
Drop an image to compress
Drag & drop, paste, or pick a file
PNG · JPG · WebP — compressed on your device
Compress any photo to 400 KB
A lot of upload forms cap images at a fixed size, and 400 KB is one of the common limits — typically for high-quality web images where you still want a smaller file. Instead of guessing quality settings, this page is preset to a 400 KB target: drop your photo in and the compressor shrinks it to roughly that size on your device, then shows you the exact before → after result.
It works on JPG, PNG, and WebP. If you only need the file to be small (not a specific format), leave the format on Auto or pick WebP — WebP reaches 400 KB at noticeably better quality than an old-school JPEG.
How to reduce your image to 400 KB
- Add your image — drag & drop, paste, or choose a file.
- It targets 400 KB automatically. The tool is already in Target size mode set to 400 KB, so it compresses straight to it. Change the number any time.
- Still too big? Turn on Resize and lower the longest edge — the single biggest lever for getting a large photo under 400 KB while staying sharp.
- Download the result — that's it.
Tip for very small targets
Hitting a tiny size like 400 KB on a 12‑megapixel phone photo by quality alone can blur it. The fix is to resize first: a photo doesn't need to be 4000px wide for a form. Cap the longest edge to ~800–1200px, and 400 KB becomes easy with quality to spare.
Compress to another size
Frequently asked questions
How do I compress an image to 400 KB?
Open your photo in the tool above — it is already set to a 400 KB target, so it compresses to roughly 400 KB instantly. Switch the format to WebP for an even smaller file, then click Download.
Can I compress a JPG or PNG to 400 KB without losing much quality?
For most photos, yes. The tool lowers the quality just enough to reach about 400 KB. For a very small 400 KB target on a large image, also turn on Resize to cap the longest edge — that is the biggest single lever and keeps the result sharp.
My image is still larger than 400 KB — what should I do?
Very large or highly detailed photos can't always reach 400 KB on quality alone. Enable Resize and lower the longest edge (e.g. to 800–1200px), and prefer WebP — together they bring almost any image down to 400 KB.
Is compressing to 400 KB done online or on my device?
The compression runs in your browser, so it is fast and works the same on phones and laptops. See our privacy policy for how data is handled.