Precise
Hit the exact limit your upload portal expects.
Exact local compression
Compress PNG to under 500KB
Compress a PNG under 500 KB without uploading it to a web compressor.
Private
Your file stays in your browser instead of being uploaded to a server.
Fast
Open the tool, hit the target, and download the result in one flow.
First file free. More files today are $3.99. No upload, no guessing.
When this page helps
Use this page when you need Compress PNG to under 500KB for a form, portal, or email attachment. UnderByte lets you aim at the limit directly instead of guessing export settings over and over.
PNG is best when you need transparency or crisp flat graphics. If the portal only cares about file size, converting to JPG will usually hit 500 KB faster.
Related exact-size tools
Compress PNG to under 100KB
Reduce a PNG under 100 KB locally. Uses lossless optimization first, then JPEG conversion if needed.
Compress PDF to 500KB Online
Compress PDF to 500KB online for forms, portals, and email uploads without sending the file to a server.
Reduce image size for email
Compress images locally before attaching them to email, with exact file-size presets.
Compress a Photo to 240KB
Compress a photo to 240KB or less in your browser, built for strict 240KB photo upload limits.