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Compress Image to 400KB Online (Free)
Reduce image file size to under 400KB. Works with JPG, PNG, and WebP. 100% private — no uploads.
JPGPNGWEBPHEIC
⚡ Try with a sample photo
Shrink a JPG, PNG, or WebP to 400KB or under in your browser — no upload, no signup, no watermark. Hitting 400KB keeps images light for the web, email, and uploads without a visible quality drop. Drop in your photo and the tool tunes the quality until it meets the 400KB target.
Getting an image under 400KB
400KB is a comfortable target for web images: small enough to load fast, large enough to stay sharp. The tool finds the highest quality setting that still fits under 400KB. You see the exact output size before downloading.
Quality-aware compression
Rather than applying a fixed quality, the tool searches for the best quality level that still lands at or below 400KB. For photos it uses JPEG/WebP encoding; for graphics with flat color and transparency it keeps PNG where that's smaller. The result is the smallest visible-quality loss for your size budget.
Private, free, unlimited
Compression runs on your device — nothing is uploaded, so screenshots, ID photos, and client images stay private. No account, no watermark, no cap on how many you compress. Need an exact pixel size too? Pair this with our image resizer.
Common ways people use it
Web performance
Serve images under 400KB to keep pages fast and improve Core Web Vitals.
Email and messaging
Attach photos under 400KB so they send quickly and don't clog inboxes.
Storage savings
Batch-compress a folder of photos to 400KB each to reclaim space without deleting anything.
Frequently asked questions
How It Works
Professional results in 3 simple steps.
1
Upload
Select your photos or videos. Files processed locally.
2
Process
Our powerful engine optimizes your files instantly.
3
Download
Get your optimized files immediately.