"What format should I save this as?" has no universal answer, and anyone who gives you one is wrong. The right format depends on three questions: is the image a photo or a graphic, does it need transparency, and where will it be used? Answer those and the choice is almost automatic. This guide gives you the decision logic and the reasoning behind each format. If you'd rather just be told, our Image Format Advisor asks the same questions and gives you the answer.
The 30-second flowchart
→ Is it a logo, icon, or flat illustration? Use SVG (export PNG where SVG isn't accepted).
→ Is it a screenshot or UI with text? Use PNG (or lossless WebP for the web).
→ Is it a photo for the web? Use WebP (or AVIF with a fallback).
→ Is it a photo for print or archiving? Use the original / high-quality JPEG, or a lossless master.
→ Does it need to animate? Use animated WebP for short loops, or video (MP4) for anything longer.
The two big questions
Almost every format decision comes down to two properties of the image. First, is it continuous-tone or flat? Photographs are continuous-tone — smooth gradients of color where lossy compression (JPEG/WebP/AVIF) hides its losses invisibly. Graphics, screenshots, and text are flat — sharp edges and solid color areas where lossy compression creates visible halos and smearing, so you want lossless (PNG/SVG/WebP-lossless).
Second, do you need transparency? If part of the image must be see-through (a logo over any background, a cutout), that immediately rules out JPEG, which has no alpha channel. PNG, WebP, AVIF, and SVG all support transparency.
Format by format
JPEG — photos, maximum compatibility
Lossy, no transparency, understood by everything ever made. The right choice for photographs when you need a format that opens anywhere, and the practical standard for print labs at quality 90+. Its weakness is sharp edges and text, where it adds blocky artifacts — never use it for screenshots or logos. Avoid re-saving the same JPEG repeatedly; each save loses a little more (generation loss).
PNG — sharp graphics and transparency
Lossless and alpha-capable. Perfect for screenshots, UI, logos as raster, line art, and anything needing crisp edges or a transparent background. The downside is file size — a photo saved as PNG can be several times larger than the JPEG, with no visible benefit. Use PNG for the things JPEG is bad at, not for photos.
WebP — the modern web default
Does lossy and lossless, supports transparency and animation, and runs in every current browser. Typically 25–35% smaller than JPEG or PNG at equivalent quality, which makes it the best general default for website images. Keep a JPEG/PNG fallback only for ancient clients or upload forms that reject WebP. See our deep dive on JPG vs PNG vs WebP.
AVIF — smallest files, newer support
The current compression champion — often another ~20% smaller than WebP, with excellent quality and transparency. The catch is that the oldest devices can't decode it, so serve it through a <picture> element with WebP/JPEG fallbacks. Encoding is slower than WebP, which matters for on-the-fly pipelines but not for assets encoded once and served many times. Compare in AVIF vs WebP.
SVG — vector graphics that never blur
Not pixels at all, but math describing shapes — so it scales to any size with zero quality loss and tiny files. The right choice for logos, icons, and flat illustrations on the web. It can't represent photographs, and some platforms won't accept it, so export PNG fallbacks for those.
GIF — legacy animation only
256 colors, large files, but it animates and runs everywhere. Reserve it for short, simple loops where compatibility is paramount. For anything detailed or longer than a few seconds, animated WebP or — better — an MP4/WebM video is far smaller and sharper.
Common scenarios
| You have… | Use |
|---|---|
| A product photo for your website | WebP (AVIF + fallback for best size) |
| A company logo | SVG, with PNG exports |
| A screenshot for documentation | PNG (or lossless WebP) |
| A favicon / app icon | SVG + multi-size PNG (+ ICO for legacy) |
| A photo to send to a print shop | High-quality JPEG (90+) or TIFF |
| A short looping animation | Animated WebP (MP4 if longer) |
| A chart or diagram for the web | SVG |
FAQ
What's the single best image format?
There isn't one. The best format depends on the content (photo vs graphic), whether you need transparency, and where it will be used. For most web photos WebP is the best default; for logos and icons SVG; for screenshots PNG. The point is to match the format to the job.
PNG or JPG?
JPG for photographs — it's lossy and produces small files with no visible loss on continuous-tone images. PNG for screenshots, logos, line art, and anything needing transparency or pixel-perfect sharp edges, where JPG would add blur and artifacts.
Should I just use WebP for everything on the web?
It's a strong default for web images — smaller than JPG/PNG at similar quality, with transparency and animation support, and universal current-browser support. Keep a JPG/PNG fallback only for very old clients or platforms that reject WebP uploads. For logos, SVG still beats WebP.
Is AVIF worth switching to?
AVIF compresses even better than WebP, often ~20% smaller, but the oldest devices (iOS 15 and earlier) can't decode it. Use it with a WebP/JPG fallback via the <picture> element. If your audience is on modern browsers, AVIF saves the most bandwidth.
References
- MDN Web Docs — Image file type and format guide
- W3C — PNG and SVG specifications
- Google WebP project documentation
- AOMediaCodec — AVIF specification
- caniuse.com — WebP / AVIF browser support tables
About the OnlyFormat Editorial Team
OnlyFormat's editorial team is made up of working web developers and image-workflow engineers who ship file-conversion tooling for a living. Every guide is reviewed against primary sources — W3C/WHATWG specifications, IETF RFCs, MDN Web Docs, ISO/IEC media standards, and the official documentation of libraries we actually use in production (libwebp, libjpeg-turbo, libavif, FFmpeg, pdf-lib). We update articles when standards change so the guidance stays current.
Sources we cite: W3C · WHATWG · MDN Web Docs · IETF RFCs · ISO/IEC · libwebp · libavif · FFmpeg · pdf-lib