PNG vs JPG: When to Use Each Format
Choose PNG for transparency and sharp graphics, JPG for photos and form uploads. Learn when WEBP or AVIF win for the web, and how FileShrinkr exports each format.
Published August 25, 2026 · Updated August 25, 2026
Quick rule of thumb
Use JPG for photographs, portraits, and any image that must open everywhere—including government forms and most email clients. Use PNG when you need a transparent background, crisp UI text, logos, or screenshots where blocky JPEG artifacts would show. Use WEBP or AVIF when you control the website and want smaller files for visitors on modern browsers.
That one paragraph covers most decisions. The rest of this guide explains why, and how FileShrinkr maps those choices to export settings.
What JPG is good at
JPG (JPEG) is a lossy format tuned for continuous-tone photos. It discards fine detail humans rarely notice at normal viewing sizes, which is why a vacation photo can shrink dramatically with little visible harm. Nearly every operating system, CMS, printer shop, and online form accepts JPG. When a portal says “JPEG only,” they mean this family of files—usually with .jpg or .jpeg extensions.
Downsides: no true transparency, and aggressive quality settings create blocky skies or muddy edges around text. Do not save a screenshot of a spreadsheet as low-quality JPG if you still need to read the numbers.
On FileShrinkr, pick JPG, set quality or a target KB size, and optionally enable MozJPEG in Server mode for sharper results at a given size. Strip EXIF when sharing publicly.
What PNG is good at
PNG supports lossless compression and alpha transparency. Logos, icons, diagrams, and UI mockups stay sharp. Photographic PNGs are often huge because natural noise does not compress well losslessly—so PNG is usually the wrong default for Camera Roll portraits.
FileShrinkr’s PNG export can keep lossless PNG enabled to preserve transparency. Turn quality concerns off mentally: PNG is not the format for “make this 20 KB for SSC.” Convert photos to JPG for KB caps.
WEBP and AVIF on the web
WEBP often beats JPG on size at similar quality and can include transparency. AVIF can go further for next-gen delivery but encoding support and decode cost vary. Use them for site performance when your stack serves modern formats with JPG fallbacks. Avoid them for opaque bureaucracy portals that only list JPEG.
See also best image format for websites.
Base64 and development
Developers embedding images in CSS or JSON often prefer PNG for icons (transparency) and JPG for photos (smaller strings). FileShrinkr Base64 Tools let you choose output format before generating a data URL. HEIC still needs server conversion first—see HEIC to JPG.
Decision table (practical)
- Exam / job form photo → JPG + target KB + correct pixels
- Email attachment of a photo → JPG or WEBP; moderate dimensions
- Logo on a colored page → PNG (transparency) or WEBP with alpha
- Blog hero photograph → WEBP or AVIF with JPG fallback; or tuned JPG
- Screenshot with text → PNG or lossless WEBP; avoid heavy JPG
How to export each on FileShrinkr
- Upload or edit your image on /.
- Select the output format radio: JPG, WEBP, AVIF, PNG, or PDF.
- For PNG, keep lossless on when you need transparency.
- For JPG/WEBP/AVIF, use the quality slider or target KB presets.
- Preview before/after, then download.
Browser mode can handle many raster exports locally; Server mode covers HEIC, PDF, EXIF strip, and MozJPEG.