Compress Image to 4MB

1. 1

   Upload your photo to SizeSnap — JPEG, PNG, and WebP formats are supported.

2. 2

   Set the target to 4MB in the size input field.

3. 3

   Press Compress — SizeSnap finds the optimal quality that fits under 4MB.

4. 4

   Download and upload to Facebook, Slack, or your WordPress media library.

Facebook processes photo uploads most cleanly when individual files are between 2MB and 5MB — 4MB hits the sweet spot where the platform's server-side encoder has plenty of data to produce a high-quality result without unnecessary processing delays. Slack displays inline image previews for files up to approximately 4MB; larger files are shown as downloadable attachments instead. WordPress media library performance benefits from images under 4MB, especially on shared hosting plans with limited PHP memory. For event photographers delivering digital downloads, 4MB per image keeps ZIP bundles manageable while preserving enough quality for social sharing and moderate-size prints.

• For Facebook uploads, 4MB at 2048px on the longest edge matches Facebook's recommended upload dimensions for the best final result.

• Slack inline previews look best when the image is already optimized — avoid uploading a 20MB original and relying on Slack's preview scaling.

• If you are building a WordPress gallery, consistent 4MB images keep page load times predictable across the gallery.

Is compressing to 4MB free?

Yes, SizeSnap is free for up to 3 compressions per day. No account needed.

Does SizeSnap work on mobile?

Yes, SizeSnap runs entirely in your browser and works on any device — iPhone, Android, tablet, or desktop.

Will my image lose quality when compressed to 4MB?

SizeSnap uses smart compression that minimizes visible quality loss. For 4MB, virtually no quality loss — this is a generous target that preserves fine detail.

What image formats are supported?

SizeSnap supports JPEG, PNG, WebP, and HEIC images. All formats can be compressed to exactly 4MB.