PNG, JPG, WebP. Three formats, three jobs, and a decade of confusion about which does what. Pick wrong and your photo is ten times heavier than it needs to be, your logo has ugly artifacts around its edges, or your transparent graphic arrives with a white box.

This guide ends the confusion permanently: what each format actually does, the decision rule for every situation, and the conversion workflow. When you need to switch formats, our Image Format Converter converts between PNG, JPG and WebP free in your browser — no signup, files never leave your device.

What each format actually is

JPG (JPEG): The photo format. Lossy compression designed for continuous-tone images — photos with gradients, millions of colors, natural detail. Brilliant at making photos small; terrible at sharp edges, text and transparency (it doesn’t support transparency at all). Universal support: everything opens JPG.

PNG: The graphics format. Lossless compression designed for sharp edges, flat colors and transparency. Perfect for logos, icons, screenshots, text overlays and any image with an alpha channel. Terrible for photos — lossless encoding of photographic detail produces enormous files. Universal support.

WebP: The modern all-rounder. Developed by Google, it does lossy compression (like JPG, but ~25–35% more efficient), lossless compression (like PNG), transparency (like PNG) and even animation. In 2026, every modern browser displays WebP. Its only weakness is legacy compatibility — some older desktop software and a few platform uploaders still don’t accept it.

The one-sentence summary: photos → JPG or WebP; graphics/transparency → PNG or WebP; web delivery → WebP; maximum compatibility → JPG/PNG.

The decision flowchart

For any image, answer two questions:

1. Does it need transparency?

  • Yes → PNG (maximum compatibility) or WebP with alpha (smaller files for web).
  • No → continue.

2. Is it a photo or a graphic?

  • Photo (continuous tones, gradients, natural detail) → WebP for web, JPG for universal compatibility.
  • Graphic (logos, icons, text, screenshots, illustrations with flat colors) → PNG, or WebP-lossless for web.

That’s it. Two questions, correct answer every time. The rest of this guide is edge cases and quality settings.

Quality settings that matter

JPG quality: 80–85 is the web sweet spot (see our compression guide for the full method). Below 70, artifacts appear in gradients and around edges. Above 90, file size grows fast for invisible gains. For archival masters, keep the original or use quality 95+.

WebP quality: roughly equivalent visual quality to JPG at 5–10 points lower on the dial — WebP 75 ≈ JPG 85 visually, at a smaller file size. Start at 80 and adjust with preview.

PNG: no quality setting — it’s lossless. The size lever for PNG is bit depth: 8-bit palette PNG (256 colors) for simple graphics, 24/32-bit for complex ones with transparency. An 8-bit logo PNG can be 70% smaller than its 32-bit version with zero visible difference.

The edge cases, answered

Screenshots: PNG. Text and UI edges stay razor-sharp, which is the whole point of a screenshot. Exception: photographic screenshots (a video still) can go JPG/WebP.

Photos with text overlays (memes, thumbnails): the photo part wants JPG, the text wants PNG. Practical answer: export the final composite as JPG 85+ (the text was rendered sharp before compression, and high-quality JPG preserves it fine) — or PNG if file size doesn’t matter.

Transparent product cut-outs: PNG for marketplaces and design tools (universal alpha support); WebP with alpha for your own website (smaller). Never JPG — it has no alpha channel, and your transparency becomes a white/black box.

Animated images: WebP supports animation at much smaller sizes than GIF. (GIF itself is obsolete for photos — 256 colors — but persists for short animations out of sheer inertia.)

Print: none of the above is ideal — use TIFF or maximum-quality JPG from the original. Web formats optimize for screens; print needs every pixel.

Email attachments: JPG or PNG. Some email clients still mishandle WebP display, and you don’t control the recipient’s client.

Conversion rules (avoiding quality damage)

  1. Always convert from the best source. PNG master → JPG is one clean step. JPG → JPG is generation loss — each re-save discards more data. If you only have the JPG, convert once and stop.
  2. Convert once, at the end. Do all editing in the best-quality format, then convert to the delivery format as the final step. Converting mid-workflow and continuing to edit compounds losses.
  3. PNG → JPG needs a background decision. JPG can’t do transparency, so transparent areas become solid — usually white or black depending on the converter. Flatten onto your intended background color deliberately instead of accepting the default.
  4. JPG → PNG never improves quality. It just makes the file bigger. The only reason to do it is workflow (you need lossless for further editing, or a tool requires PNG input).
  5. Check the result at 100%. Especially JPG conversions of graphics — look for artifact fringing around sharp edges. If you see it, the source should have stayed PNG.

The 60-second conversion workflow

  1. Open our Image Format Converter.
  2. Drop in your file — it never leaves your browser.
  3. Pick the target format using the two-question rule above.
  4. For JPG/WebP, set quality (85 for photos is the safe default).
  5. Download, check at 100% zoom, done.

Batch tip: convert entire folders with consistent settings — a product catalog’s worth of PNG photos becomes web-ready JPGs in minutes, often cutting total page weight by 80%+.

The bottom line

The format confusion ends with two questions: transparency? photo or graphic? PNG for graphics and transparency, JPG for universal photo compatibility, WebP for modern web delivery. Convert from the best source, convert once, check at 100%. Keep our Format Converter bookmarked — and when file size (not format) is the problem, our compression guide picks up where this one leaves off.