Compression

Compress Image to 400KB Online — Free

Automatically compress any JPEG, PNG, or WebP image to exactly 400KB or smaller. Binary-search quality algorithm. No upload required.

✓ Free⚡ Instant🔒 No Upload
Settings
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How to Use

01
Upload your image — JPEG, PNG, or WebP up to 20MB.
02
The tool auto-calculates the best quality to reach 400KB or less.
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Preview before/after file sizes in real-time.
04
Download your 400KB image.
Quick Answer

Compress Image to 400KB: Automatically compress any JPEG, PNG, or WebP image to exactly 400KB or smaller. Binary-search quality algorithm. No upload required. Free, instant, no upload required.

Frequently Asked Questions

Websites, email attachments, and CMS media libraries typically cap uploads at 400KB for performance reasons.
A binary-search algorithm tests quality levels between your minimum and 95%, converging within 14 iterations. If quality reduction alone isn't enough, dimensions are scaled down minimally.
Never. All processing runs in your browser using the Canvas API and Web Workers.
Yes — Pixaroid runs in all modern mobile browsers including Chrome for Android and Safari on iOS. No app needed.
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.