Compression

Compress JPEG to 400KB Online Free

Compress any JPEG image to exactly 400KB online free. Binary-search quality algorithm finds the optimal setting for maximum quality at 400KB. No upload required.

✓ Free⚡ Instant🔒 No Upload
Settings
Target Size
Output Format
Compressing…
0%
smaller
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ORIGINAL
RESULT

How to Use

01
Upload your JPEG image — drag-and-drop or click to browse. Supports JPEG, PNG, WebP, HEIC up to 20MB.
02
The tool targets 400KB automatically using a 16-iteration binary-search quality algorithm.
03
Preview the before/after sizes and quality comparison in real time.
04
Click "Compress to 400KB" and download your optimised JPEG.
Quick Answer

Compress JPEG to 400KB: Compress any JPEG image to exactly 400KB online free. Binary-search quality algorithm finds the optimal setting for maximum quality at 400KB. No upload required. Free, instant, no upload required. Works on all devices including mobile.

Frequently Asked Questions

Upload your image to the Pixaroid JPEG compressor, then click "Compress to 400KB". The binary-search algorithm automatically finds the highest quality setting that produces a file at or below 400KB.
A 400KB JPEG file is ideal for web photos, print-ready images, and social media posts. At this size the excellent quality level looks good on screen while loading fast.
Some quality reduction is expected. The tool finds the highest quality that still meets 400KB. For the best result, resize the image to its final display dimensions before compressing.
Never. All JPEG compression runs entirely in your browser using the Canvas API and Web Workers. Your files never leave your device.
Yes — use the Bulk Image Compress tool to process up to 100 images and download as a ZIP file.
Set JPEG quality to 80–85% — at this level the difference from the original is invisible to the human eye while reducing file size by 60–70%. Converting to WebP at 80% quality gives even smaller files at equivalent visual quality. Pixaroid shows a side-by-side comparison so you can judge the result before downloading.
Pixaroid is a free, browser-based image compressor that requires no upload, no account, and adds no watermarks. It supports JPEG, PNG, WebP, HEIC, GIF, and BMP. All compression happens locally in your browser using the Canvas API, so your files never leave your device.