WebP vs AVIF vs JPG: Which Should You Actually Use?
Ask which image format is “best” and you’ll get different answers depending on who you ask and what they’re optimizing for. AVIF wins on raw compression efficiency. WebP wins on the best balance of efficiency and broad support. JPG wins on the thing that ultimately matters most in a lot of real situations: it works absolutely everywhere, with zero exceptions, because it’s been the default for over thirty years. None of these answers is wrong — they’re answers to slightly different questions, and the right format genuinely depends on what you’re doing.
The technical comparison, briefly
At a similar level of visual quality, AVIF typically produces the smallest files of the three, often beating JPG by 50% or more and edging out WebP by a smaller but still meaningful margin. WebP sits in between — usually 25-35% smaller than JPG at comparable quality, with the added benefit of supporting both lossy and lossless modes plus transparency, something JPG never had. JPG remains the largest of the three at equivalent quality, but it’s not actually a bad format technically — it’s simply older and less efficient by the standards modern codecs have since set.
Compression efficiency, though, is only half the picture. The other half is where each format can actually be used without running into problems.
Compatibility is where the story changes completely
JPG support is universal in a way the other two simply aren’t yet, and arguably never need to be to remain useful. Every browser, every operating system, every photo editor built in the last two decades, every printer, every upload form — JPG works, full stop, with no version caveats or partial-support footnotes.
WebP’s browser support is now close to universal across modern browsers, which is why so many websites have switched to serving it as their default delivery format. Support outside the browser — desktop photo editors, business software, some printing workflows — has caught up substantially but is still not as complete as JPG’s, particularly on older or more specialized software that hasn’t been updated recently.
AVIF is earlier in that same adoption curve. Browser support has grown quickly and is now solid across current versions of major browsers, but non-browser software support remains noticeably more patchy than WebP’s — a meaningful amount of currently-installed photo editing and business software either doesn’t recognize AVIF at all or only added support very recently.
So which one should you actually use?
For a website, serving images to visitors’ browsers: AVIF or WebP, with a JPG fallback for older browsers, is the modern best practice — and most image-serving setups (CMS plugins, CDN image services, modern build tools) handle this automatically by serving whichever format a visitor’s browser supports best. If you’re hand-picking one format rather than relying on automatic format negotiation, WebP is the safer single choice right now: nearly all of AVIF’s size benefit over JPG, with meaningfully more consistent support.
For files you need to share, attach, or upload outside a browser context: JPG remains the dependable default. Email attachments, government and exam portal uploads, printing services, and a lot of business software still assume JPG (or sometimes PNG) and may reject or mishandle WebP or AVIF outright. If you’ve ever downloaded a WebP or AVIF image from a website and then found it wouldn’t open somewhere else, this is exactly why — and converting it to JPG is usually the fastest fix.
For graphics needing transparency or lossless precision — logos, icons, screenshots with text: PNG remains relevant regardless of where JPG, WebP, or AVIF fit into the picture, since none of the three lossy-photo-focused formats is really competing in that space. WebP can also serve this role (it supports lossless mode and transparency), often at a smaller file size than PNG for the same content, if browser-only compatibility is acceptable.
A practical decision, not a religious one
It’s tempting to treat format choice as a question with one universally correct answer, but the actual right call depends entirely on where the image is going. A photo headed straight into a modern website’s <img> tag has very different requirements than a photo you’re about to email to someone, or upload to a twelve-year-old government portal that validates file types strictly. Optimizing for AVIF’s superior compression on a file that then fails to open in the one place it actually needs to be used isn’t really optimizing for anything.
What’s likely to change going forward
AVIF’s non-browser support gap will almost certainly narrow over the next few years, the same way WebP’s did — software vendors tend to add support for a format once enough of the web has already adopted it, with a lag of a few years behind browser adoption. For now, though, treating JPG as your compatibility fallback, WebP as your default for general web use, and AVIF as a bonus optimization where you can confirm it’ll actually be supported is a reasonable, low-risk way to navigate the current state of all three.