Compress Screenshot — Free, Fast & Private
Screenshots are deceptively large files. A single full-screen capture on a modern display can be 3-8MB as PNG, and Retina/HiDPI screens double or triple that. When you need to share screenshots in Jira tickets, Slack messages, Confluence pages, or email threads, that file size adds up fast.
The challenge with compressing screenshots is different from compressing photos. Screenshots contain sharp text, UI elements, and flat colour areas — artifacts that look terrible with aggressive JPEG compression but compress beautifully with the right approach. Standard photo compression tools often blur the text, making the screenshot useless for its intended purpose.
For most screenshots, PNG with Smart compression is the best approach. It preserves every pixel of text while removing unnecessary metadata and optimising the colour palette. This typically reduces file size by 40-60% without any visible change. If you need even smaller files, converting to JPEG at quality 85+ works well for screenshots without transparency — the text stays readable at that quality level.
Retina screenshots deserve special attention. A 2x Retina capture of a 1440px-wide screen produces a 2880px-wide image. If the screenshot is going into documentation or a web page that displays at 1440px, you can resize to 1920px max width and still have more than enough detail. This single step cuts file size by over 50% before compression even starts.
All processing runs in your browser. Screenshots often contain sensitive information — code, internal tools, private conversations, customer data. With MiniPx, none of that leaves your device. Sometimes the right compression is total: when what you actually need from a capture is its words — an error message, a snippet from a slide — extract the text with on-device OCR and paste kilobytes of text instead of megabytes of pixels. If a screenshot has to go public with a detail that should not — an account number, an email address, a customer name — pixelate that region before compressing, and use generous block sizes: heavily pixelated text is the only kind that stays hidden. If the detail is a face — a video-call tile, a colleague's webcam corner — the face blur tool can find and soften every face on-device in one pass. And when a light-mode capture needs to sit in dark-mode documentation, a quick pass through the colour inverter makes a serviceable first draft.
If a screenshot contains red or blue text and looks fringed after saving as JPEG, the cause is chroma subsampling rather than the quality setting — JPEG stores colour at half resolution, so PNG or WebP is the right format for coloured type.
For screenshots that live in documentation rather than a chat, the documentation-specific guide covers retina capture and readable UI text.