2026-07-29

Screenshots are always PNG by default — here's how to paste one straight into a smaller JPG or WebP

Take a screenshot on a Mac or a Windows PC and it comes out as a PNG, whether you wanted a PNG or not — there's no setting for that, and no dialog that asks. That default has a real cost: PNG screenshots pile up in storage a lot faster than they need to, and the built-in tools give you no easy way to change it. Here's why that default exists, why so many people want out of it, and how to go straight from "screenshot on my clipboard" to "small JPG or WebP file" without ever saving a PNG to disk first.

Why screenshots are PNG by default, on both Mac and Windows

This isn't an oversight. Apple's own support documentation is direct about it: "Screenshots are saved as .png files and screen recordings are saved as .mov files" — full stop, with no built-in option in the Screenshot app to change that. Windows' Snipping Tool works the same way: it saves images only in PNG by default, and there's no setting in the app itself to switch that default to JPEG or WebP. PNG's lossless compression is genuinely the right call for a screenshot — sharp UI text and flat-color icons are exactly the case where PNG looks clean and a lossy format shows artifacts — so the default isn't wrong. It's just permanent unless you do something about it yourself.

The real cost: PNG screenshots add up

How much that actually costs became a public, on-the-record complaint in 2026: a feature request posted directly to Microsoft's own Community Hub asked for a dropdown to set JPEG or WebP as the Snipping Tool's default output, with a concrete number attached — "a PNG screenshot can be 1 MB, while in JPEG it drops to ~200 KB with no noticeable loss of quality." The use case behind the request was mundane and common: people building large personal note vaults (the post specifically mentions Obsidian) who capture dozens of screenshots a week and watch their storage climb for no visual benefit. As of this writing, that thread is still open, with no built-in fix shipped.

Every workaround still makes you save a file first

The same Microsoft Community Hub post makes the actual friction point explicit: Windows does have a Markup screen that lets you re-save a capture in another format, but as the user who requested the feature put it, that "adds extra steps and breaks that quick copy-paste flow." The default clipboard behavior — screenshot, then straight into a chat, email, or doc — is exactly what most people actually want; converting the format is the part that forces a detour: save the PNG somewhere findable, open a converter, upload it, wait, download the result, then remember to delete the original. And for anything with a dashboard, a private message, or an internal tool visible in the frame, uploading that screenshot to some converter site is its own small privacy problem, not just an inconvenience.

The usual route saves a PNG to disk before any converter can touch it. Pasting a screenshot directly into NearIMG skips that step entirely.

What's actually different about pasting into a browser tool

Browsers have gotten genuinely good at this over the last couple of years. MDN's own documentation for the Clipboard read() method marks it Baseline — "newly available" since June 2024 and now working across current versions of every major browser — and describes exactly what a screenshot arrives as: "Browsers commonly support reading text, HTML, and PNG image data." That's not a coincidence with what your OS just produced; a pasted screenshot shows up in the browser as the same PNG image data your Screenshot app or Snipping Tool just created, readable directly out of the clipboard with no upload step required to get it there.

NearIMG's own paste handling uses the plainer, even more widely supported version of this: press Ctrl+V (or Cmd+V) anywhere in the app and it listens for the browser's paste event, reads whatever files your clipboard is currently holding — a screenshot, a copied file from Explorer or Finder, anything the browser reports as a file — and feeds every one straight into the editor, unfiltered by file type. There's no separate "attach a file" step, because the paste itself is the attach step.

The actual steps

Take your screenshot as usual — Win+Shift+S on Windows, Cmd+Shift+4 on a Mac. It lands on your clipboard as a PNG, exactly like it always has.
Open NearIMG and press Ctrl+V (or Cmd+V) directly in the app. No "Save As" dialog, no file on your Desktop to find and delete afterward.
If the capture has more window chrome or desktop around it than you actually need, trim it with the Crop tool before exporting.
Switch the output format to JPG or WebP and dial in a quality setting — the Compress tool shows the resulting file size before you commit to it, so you can see a size drop for yourself instead of guessing.
Download. Nothing was ever uploaded anywhere — the paste, the crop, and the format conversion all happen in that one browser tab.

JPG or WebP — which one for a screenshot?

Worth knowing before you pick: sharp text and flat UI color are the specific case where JPEG's block-based compression is weakest, so a screenshot pushed to a low JPEG quality setting is where you're most likely to actually see it — soft edges around letters, faint blocky halos near hard color boundaries. That's not a reason to avoid JPEG for screenshots entirely; at a high quality setting it's usually fine, and the file-size win described above is real. WebP is the other format NearIMG converts to, and it's generally the better fit for graphics-heavy captures for the same reason covered elsewhere on this blog — it's simply more efficient than JPEG at a matching quality level, on top of also supporting transparency if a capture needs it. Either way, in NearIMG's Compress tool the quality slider only does something on JPEG and WebP output — switch to PNG and it has nothing left to compress losslessly harder than it already does.

Honest limits

This is for still screenshots, not screen recordings. A screen recording on a Mac saves as a .mov video file, not an image — that's a different format problem NearIMG's image tools don't address.
Pushed too far, WebP and JPEG both soften text. A high quality setting keeps a screenshot's text and UI edges clean; dragging the slider down for a smaller file shows up fastest on exactly the kind of flat color and sharp lines a screenshot is made of.
Paste support depends on your browser actually reporting the clipboard item as a file — true of every current version of Chrome, Edge, Firefox, and Safari per MDN's own compatibility notes, but not guaranteed on something very old.

The short version

PNG is the right default for a screenshot, which is exactly why neither macOS nor Windows gives you a setting to change it — and exactly why so many people, including a user asking Microsoft directly for one, end up wanting a smaller JPG or WebP without leaving their normal copy-paste habit. Pasting straight into NearIMG with Ctrl+V skips the save-a-PNG-first detour entirely: crop out what you don't need, pick JPG or WebP, and download — without a single file ever touching a server.