HEIC, WebP, AVIF, PNG, or JPG: How to Choose an Image Format

Start with where the copy will be opened: a website, an upload form, a messaging app, an editor, a print workflow or a long-term archive. Support rules and the need for transparency or further editing matter before file size. Keep the original until the delivered copy has been opened and accepted.

This guide uses one controlled graphic rather than declaring a universal winner. Its transparent margin, smooth gradient, flat colors, small text and thin rules reveal different trade-offs. The exact file sizes apply only to this image and these settings.

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The transparent outer area exposes JPG’s key limitation, while gradients, small type and 1 px lines provide useful visual checks.

JPG is a compatibility-first delivery copy for photographs and other opaque images. PNG is a strong choice for lossless pixel detail and transparency, especially screenshots, logos and UI graphics, though it can be larger. WebP supports lossy or lossless web delivery and transparency. AVIF can be efficient for web images and supports transparency, but the receiving service still needs testing. HEIC/HEIF is often an efficient capture or storage input; make a compatible copy when the destination rejects it.

Open Image Format Converter above. The operation stays in this browser. Select the localized PNG, choose WebP, set quality to 82%, and leave maximum width and height at 0 so the original dimensions and aspect ratio remain unchanged.

1. 1

   Select the source copy.

   Choose mvtools-format-sample.png. Preserve a separate original before any batch conversion.

2. 2

   Choose WebP and set quality.

   Use 82% for this reproducible example. It is a starting point, not a recommended value for every image.

3. 3

   Keep dimensions unchanged.

   Both resize fields stay at 0. Set a maximum only when the delivered copy truly needs fewer pixels.

4. 4

   Convert once and wait.

   The worker processes the image locally and adds the result to the conversion queue.

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Figure 1 · This WebP run keeps the original 1200 × 800 dimensions and uses an 82% encoder setting.

The 100 KB PNG became a 31 KB WebP, shown as 69% smaller, while remaining 1200 × 800. This is a result for a graphic with large flat areas and transparency; a detailed photograph can produce a different order and ratio.

Open the downloaded output, not only the thumbnail. Inspect the transparent edge, title and 1 px lines at normal size and while zoomed. Then test the real upload or publishing destination.

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Figure 2 · The real browser run produced a 31 KB WebP, 69% smaller than this source.

• Confirm the file opens in the actual app or service.
• Check transparency against both light and dark backgrounds.
• Inspect gradients for banding and fine text for halos or blur.
• Verify pixel dimensions, orientation and file extension after download.

JPG cannot store transparent pixels. In this example the JPG background is explicitly set to #F1F5F9 before conversion at 86%, producing a 49 KB file—51% smaller than the source. A white, dark or brand-colored background would produce different pixels and possibly a different size.

Do not use JPG for a logo or cutout that must adapt to different page backgrounds. Choose PNG, WebP or AVIF when alpha transparency is part of the design.

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Figure 3 · JPG has no alpha channel, so the transparent area is deliberately filled with #F1F5F9.

HEIF is a container and HEIC commonly identifies HEIF images encoded with HEVC. Treat the camera file as the retained source when it matters. Convert a copy when an upload form, editor or recipient does not accept the original, then compare orientation, colors, dimensions and metadata-dependent details.

Our localized 62 KB test input was decoded in the browser and converted to a 50 KB JPG at the same 1200 × 800 dimensions. That successful run proves this sample worked in this browser; it does not guarantee every HEIC variant or damaged file will decode.

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Figure 4 · The 62 KB HEIC input decoded locally and produced a 50 KB JPG copy.

The re-encoded PNG was 130 KB, WebP 31 KB, AVIF 34 KB, and JPG 49 KB. The re-encoded PNG is larger than the optimized source in this experiment, which is a useful reminder that conversion does not automatically compress. Choose after visual inspection and destination testing, not from extension or size alone.

For a website, preserve a dependable fallback when your audience or delivery stack requires it. For editing or archiving, keep the highest-value original rather than repeatedly converting lossy copies.

Image Format Converter accepts up to 20 HEIC, HEIF, JPG, PNG, WebP or AVIF files at once, with a limit of 30 MB and 40 megapixels per image. It outputs JPG, PNG, WebP or AVIF, preserves aspect ratio when resizing, and performs decoding, resizing and conversion in the browser without uploading the images.

Browser capability still affects whether a particular format can be decoded or encoded. For server-side JPG, PNG or WebP compression and optional metadata removal, Image Compressor is a separate temporary-upload workflow with a default 30-minute cleanup window.