WebP vs JPG vs PNG: Which Image Format Should You Use?

Updated October 13, 2026 · imgtez

JPG, PNG and WebP are the three image formats you will meet most often on the web. Each was designed for a different job, and choosing the wrong one can mean blurry logos, bloated web pages or files that refuse to upload. This guide compares them honestly, with practical rules for when to use each, and explains how newer formats such as AVIF and HEIC fit in.

The short answer

• JPG for photographs that need to work everywhere: email, printing, forms, older software.
• PNG for screenshots, logos, diagrams, text and anything that needs sharp edges or transparency with perfect quality.
• WebP for websites, where smaller files load faster, as long as your platform supports it.

Now for the details behind those rules.

JPG (JPEG): the universal photo format

JPEG was standardised in 1992 by the Joint Photographic Experts Group, and it remains the most widely supported image format in the world. It uses lossy compression: the encoder splits the image into 8×8 pixel blocks, converts them into frequency components with a discrete cosine transform, and discards fine detail that the human eye is unlikely to notice. Colour information is usually stored at lower resolution than brightness (chroma subsampling), because our eyes are more sensitive to light than to colour.

This works extremely well for photographs, with their smooth gradients and natural textures. A 12-megapixel photo that would be 36 MB uncompressed is often just 2–4 MB as a high-quality JPG. The weaknesses show up with hard edges: text, line art and flat-colour graphics develop fuzzy "ringing" and blocky artifacts. JPG also has no transparency, so any transparent areas must be filled with a solid colour when converting – our PNG to JPG converter lets you pick that background colour.

Every time you edit and re-save a JPG, a little more quality is lost. For master copies you plan to edit repeatedly, keep a lossless original.

PNG: lossless and transparent

PNG (Portable Network Graphics) was created in the mid-1990s as a patent-free replacement for GIF. Its compression is lossless: the decoded image is identical, pixel for pixel, to the original. It supports full alpha transparency, meaning each pixel can be partially see-through, which is essential for logos placed on different backgrounds, UI icons and overlays.

The cost is size. For photographs, PNG files are often five to ten times larger than a good JPG, because lossless compression cannot throw away the random-looking detail in natural images. For screenshots and graphics with large areas of flat colour, though, PNG can be smaller than JPG and is always crisper.

Use PNG when you need exact pixels: screenshots of documents or code, diagrams, charts, pixel art, images with text, or source files you will edit later. If you have a PNG photo that is too large to email, convert it to JPG.

WebP: Google's modern all-rounder

WebP was released by Google in 2010, based on the VP8 video codec. Unlike JPG and PNG, it supports both lossy and lossless compression, plus transparency and animation, all in one format. Google's own studies found lossy WebP files around 25–34% smaller than JPEGs of equivalent quality, and lossless WebP about 26% smaller than PNG. Real-world savings vary with the image, but WebP is reliably smaller.

Browser support is now universal among modern browsers: Chrome, Edge, Firefox, Opera and Safari (since Safari 14 on macOS Big Sur and iOS 14) all display WebP. That is why many websites now serve WebP automatically, and why images you save from the web increasingly arrive as .webp files.

The problem is everything outside the browser. Some older image editors, office software, print shops, marketplaces and upload forms still reject WebP. If a site will not accept your file, convert it with our WebP to JPG or WebP to PNG tools. Going the other direction, JPG to WebP and PNG to WebP are great for speeding up your own website.

Side-by-side comparison

What about AVIF and HEIC?

AVIF is based on the AV1 video codec and usually compresses even better than WebP, with excellent support for HDR and wide colour. Chrome, Firefox and Safari 16+ can display it, but encoding is slower and support in desktop software is still patchy. If you download an AVIF and need something more compatible, use AVIF to JPG.

HEIC is Apple's default camera format. It is very efficient, but Windows and most browsers cannot open it without help. See What is HEIC and how to open it on Windows.

Choosing a quality setting

For lossy formats (JPG and WebP), the quality slider trades file size against visual fidelity. Some practical guidelines:

• 90–95%: near-indistinguishable from the original; good for printing and archiving.
• 80–85%: the sweet spot for most photos online. Files are much smaller with no obvious loss.
• 60–75%: acceptable for thumbnails and previews; artifacts may appear in skies and skin tones.
• Below 50%: visible blocking and smearing. Rarely worth it.

Resizing often saves more than lowering quality. A 4000-pixel-wide photo displayed in a 1200-pixel column wastes most of its bytes. Our converters include a maximum-width option so you can resize and convert in one step.

Common mistakes to avoid

• Saving logos as JPG. The edges blur and the background turns into a white box. Use PNG or WebP.
• Saving photos as PNG for the web. Pages become slow. Use JPG or WebP.
• Converting JPG to PNG to "improve quality". Lost detail cannot be recovered; PNG only preserves what is already there. Convert to PNG only if you need to edit without further loss.
• Repeatedly re-saving JPGs. Keep an original and export once at the end.

Conclusion

There is no single best format. JPG is the safe choice for photos you share, PNG is the precise choice for graphics and screenshots, and WebP is the efficient choice for the web. Because all three are easy to convert between, you can always store a high-quality master and export the right format for each job. All imgtez converters run entirely in your browser, so you can do this quickly and privately – browse the full list on the home page.