Is PNG or JPG better?

Neither is universally better — they're built for different content. JPG's lossy compression makes it far smaller for photographs, while PNG's lossless compression keeps screenshots, text, and graphics free of blur and adds transparency support that JPG lacks entirely. Use JPG for photos, PNG for anything with sharp edges, text, or a transparent background.

Is WebP better than JPG?

For file size and quality, generally yes: WebP typically produces files 25-35% smaller than an equivalent-quality JPG, and it also supports transparency and lossless compression, which JPG can't do at all. The only reason to still choose JPG over WebP is compatibility with older software or workflows that don't open WebP files.

Does WebP support transparency?

Yes. WebP has a full alpha transparency channel in both its lossy and lossless modes, so it can replace PNG for transparent logos and icons while usually producing a smaller file.

Should I convert HEIC to JPG or PNG?

Convert to JPG in almost all cases — it's smaller and universally compatible, which matches what a camera photo needs. Only convert to PNG if you specifically need lossless quality or a transparent background, which is uncommon for an ordinary photo.

Which format produces the smallest file?

For photographs, lossy WebP is usually smallest, followed by JPG, with PNG far larger. For screenshots, text, or line art, lossless WebP is usually smallest, followed by PNG, since JPG's lossy compression isn't well suited to sharp edges regardless of file size.

Can I convert between PNG, JPG, and WebP without losing quality?

Converting from a lossless format (PNG) to another lossless setting preserves quality exactly. Converting to or between lossy formats (JPG, lossy WebP) always re-compresses the image, so some quality is lost on each conversion — keep a lossless master copy if you expect to convert or edit an image more than once.

PNG vs JPG vs WebP — which image format should I use?

LocalMedia Tools · Jul 4, 2026

Almost every image on the web is one of three formats, and each one trades away something different to get there. JPG compresses photographs aggressively by discarding detail your eye is unlikely to miss, PNG keeps every pixel exactly as it was and adds transparency, and WebP is Google's newer format that tries to do both jobs — lossy and lossless, with transparency — in a smaller file than either older format usually produces. Picking the wrong one is rarely fatal, but it does mean either bloated page-load times or visibly blurry, blocky images. This guide breaks down what each format actually does under the hood, where HEIC (the format iPhones save photos in) fits into the picture, and how to convert or compress any of them without uploading a file anywhere.

What is JPG and when should you use it?

JPG (also written JPEG) uses lossy compression: it analyzes the image in blocks, discards fine detail and color variation the human eye is bad at noticing, and reconstructs an approximation on decode. That trade-off is exactly why JPG is small — a photograph that would take several megabytes uncompressed often compresses to a few hundred kilobytes at a quality setting most people can't distinguish from the original. JPG has no transparency channel, so it always renders on an opaque background, and it isn't a good fit for screenshots, line art, or text, where the soft blurring around sharp edges becomes obvious. Use JPG for photographs and photo-like images — product shots, portraits, landscapes — where file size matters and a background is expected.

What is PNG and when should you use it?

PNG uses lossless compression: every pixel you save is the exact pixel you get back, with no approximation. That makes PNG the right choice for screenshots, UI mockups, logos, diagrams, and any image containing sharp text or hard edges, where lossy artifacts would be immediately visible as blur or blocky noise around the edges. PNG also supports a full alpha (transparency) channel, so a logo or icon can have a genuinely see-through background instead of a white or colored box around it. The cost is size: because PNG can't throw detail away, a photograph saved as PNG is typically several times larger than the same photo saved as JPG, for no visible quality gain on a photographic subject.

What is WebP and how is it different from JPG and PNG?

WebP is a newer format built to replace both of the older ones at once. It supports both lossy and lossless compression in the same file format, plus a full transparency channel like PNG — so a single format can handle a compressed photo, a lossless screenshot, and a transparent logo. In practice, WebP files typically run 25-35% smaller than an equivalent-quality JPG, and lossless WebP is usually smaller than the same image saved as PNG too. Browser support has been near-universal since the early 2020s (every major browser renders it natively), which removed the main historical objection to using it. The remaining catch is compatibility outside the browser: some older image editors, legacy CMS plugins, and print or design workflows still don't open WebP directly, so it's worth checking your specific toolchain before standardizing on it everywhere.

Where does HEIC fit in, and should you convert it?

HEIC is the format iPhones use by default for photos since iOS 11 — it compresses more efficiently than JPG at a similar quality, which is why it takes up less space on your phone. The problem is compatibility, not quality: plenty of Windows software, older Android apps, web forms, and email clients either can't open a .heic file at all or handle it awkwardly. If you're sharing a photo somewhere that might not support HEIC — uploading to a website, emailing someone on an unknown device, posting to older software — convert it to JPG first for the widest compatibility, or to PNG only if you specifically need lossless quality or transparency (rare for a camera photo). LocalMedia's HEIC to JPG converter handles this conversion entirely in your browser, so the photo is read from your device, converted, and saved back without being uploaded anywhere.

Which format should you actually pick, by use case?

The decision usually comes down to what the image contains and where it's going. For a photograph or photo-realistic image destined for the web, use WebP if your platform accepts it, or JPG otherwise. For a screenshot, scanned document, diagram, or anything with text, use PNG (or lossless WebP) so the edges stay sharp. For a logo, icon, or graphic that needs a transparent background, use PNG or WebP — never JPG, since it can't represent transparency at all. For maximum compatibility with old software, email clients, or print workflows, JPG and PNG remain the safest universal choices, since WebP support outside modern browsers is still inconsistent.

Why does re-saving a JPG repeatedly make it worse?

Because JPG's compression is lossy, every time you open a JPG, edit it, and save it again as a JPG, the format re-analyzes and re-discards detail on top of whatever was already discarded the first time. Edit-and-resave a few times and the accumulated loss becomes visible as soft blur, color banding, or blocky artifacts around edges — a problem often called generation loss. This doesn't happen with PNG, since lossless compression never throws detail away regardless of how many times you resave it. If you need to edit a photo multiple times, keep a PNG or other lossless master copy during editing and only export to JPG once, at the end, for final delivery.

How do you convert or compress images without uploading them?

Converting between JPG, PNG, WebP, and HEIC, or shrinking a file that's too large, doesn't require sending the image to a server at all — a browser can decode and re-encode most common image formats on its own. LocalMedia's image format converter switches between JPG, PNG, and WebP directly in your browser tab, and the image compressor reduces file size by adjusting quality or dimensions, both without the file ever leaving your device. You can confirm this yourself: open your browser's DevTools (F12), go to the Network tab, and watch for an upload request while you convert or compress a file — a genuinely local tool sends nothing.

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FAQ

Is PNG or JPG better?: Neither is universally better — they're built for different content. JPG's lossy compression makes it far smaller for photographs, while PNG's lossless compression keeps screenshots, text, and graphics free of blur and adds transparency support that JPG lacks entirely. Use JPG for photos, PNG for anything with sharp edges, text, or a transparent background.
Is WebP better than JPG?: For file size and quality, generally yes: WebP typically produces files 25-35% smaller than an equivalent-quality JPG, and it also supports transparency and lossless compression, which JPG can't do at all. The only reason to still choose JPG over WebP is compatibility with older software or workflows that don't open WebP files.
Does WebP support transparency?: Yes. WebP has a full alpha transparency channel in both its lossy and lossless modes, so it can replace PNG for transparent logos and icons while usually producing a smaller file.
Should I convert HEIC to JPG or PNG?: Convert to JPG in almost all cases — it's smaller and universally compatible, which matches what a camera photo needs. Only convert to PNG if you specifically need lossless quality or a transparent background, which is uncommon for an ordinary photo.
Which format produces the smallest file?: For photographs, lossy WebP is usually smallest, followed by JPG, with PNG far larger. For screenshots, text, or line art, lossless WebP is usually smallest, followed by PNG, since JPG's lossy compression isn't well suited to sharp edges regardless of file size.
Can I convert between PNG, JPG, and WebP without losing quality?: Converting from a lossless format (PNG) to another lossless setting preserves quality exactly. Converting to or between lossy formats (JPG, lossy WebP) always re-compresses the image, so some quality is lost on each conversion — keep a lossless master copy if you expect to convert or edit an image more than once.