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, use /compress-jpg or a target-KB page; server-mode JPG is encoded with MozJPEG, which is sharper at a given size. Strip EXIF with /remove-image-metadata 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.
/compress-png keeps lossless PNG enabled to preserve transparency. PNG is not the format for “make this 20 KB for SSC.” Convert photos with /png-to-jpg or /compress-image-to-20kb for KB caps.
WEBP and AVIF on the web
WEBP often beats JPG on size at similar quality—try /jpg-to-webp. AVIF can go further via /jpg-to-avif or /webp-to-avif. 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). Use /image-to-base64 or /base64-to-image and choose output format before generating a data URL. HEIC still needs server conversion first—see /heic-to-jpg or HEIC to JPG.
Decision table (practical)
- Exam / job form photo → /compress-image-to-100kb or /compress-image-to-20kb + correct pixels
- Email attachment of a photo → homepage compressor or /jpg-to-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
Use the /image-converter hub or a dedicated pair page, then upload and download:
- PNG to JPG · JPG to WEBP · WEBP to PNG · AVIF to JPG
- HEIC to JPG for iPhone photos · Images to PDF for multi-page scans
On any compressor page: pick JPG, WEBP, AVIF, PNG, or PDF, tune quality or target KB (20 / 100 / 500), and preview before download. Server mode covers HEIC, PDF, and EXIF strip.