How do I convert PNG to JPG without losing quality?

Technically, every PNG-to-JPG conversion loses some quality because JPG is lossy by definition. To minimize the loss, set JPG quality to 95 or higher in PDFFlare's Convert Image tool — the result will still be 30-50% smaller than the PNG, with compression artifacts only visible under heavy magnification. For archival copies, keep both the original PNG and the JPG. For web delivery, JPG quality 85-95 is the right tradeoff between file size and visible quality.

When should I convert PNG to JPG (and when shouldn't I)?

Convert when: the source is a photograph with smooth gradients, file size matters, the destination is photo-heavy (web, email, social media), and there's no transparency to preserve. Don't convert when: the PNG has transparency (you'll lose the alpha channel to a flat background color), the source is a screenshot or UI mockup (JPG's blocky compression looks bad on flat-color regions), or the source has sharp text overlays (JPG smears the edges of text).

Can I batch convert PNG to JPG online?

Yes — PDFFlare's Convert Image tool accepts batches up to a few hundred files at once. Drop all your PNGs together, set the output format to JPG and the quality level, click Convert. Each PNG is converted individually with the same settings; results download as a zip (or individually if you prefer). Useful when converting a folder of 100+ product photos in one shot. The conversion runs in your browser via WebAssembly codecs, so even large batches don't hit a server.

What happens to PNG transparency when I convert to JPG?

JPG doesn't support transparency, so the transparent pixels are filled with a solid background color when you convert. PDFFlare's Convert Image lets you pick the background color (white is the default; black, gray, or any custom hex color also works). If you need to preserve transparency, convert to WebP or AVIF instead — both are modern formats that support alpha channels with much smaller file sizes than PNG.

Should I convert JPG to PNG?

Only in specific situations. JPG-to-PNG doesn't restore lost quality (the JPG artifacts are baked in), and the resulting PNG is usually 5-10x larger than the JPG. Reasons to convert anyway: (1) you need to add transparency in an editor; (2) you're passing through a PNG-only pipeline; (3) you want lossless re-saves to avoid stacking JPG compression. For most cases, keep the JPG as JPG.

May 7, 20267 min read

How to Convert PNG to JPG (and Back) — Free, No Quality Loss

Convert PNG to JPG is one of the most-asked image conversion queries on the web — and one of the most misunderstood. PNG files are larger because they're lossless; JPG files are smaller because they're lossy. Before you convert, the question isn't “how” but “should I?” — converting a transparent logo to JPG fills the transparency with white, which might break your design.

In this guide you'll learn how to convert PNG to JPG (and JPG to PNG when you need to go the other way) using PDFFlare's Convert Image tool — when each conversion makes sense, when it doesn't, and how to batch the conversion for many files at once.

What's the Difference Between PNG and JPG?

PNG — Portable Network Graphics, 1996. Lossless compression, supports transparency (alpha channel), 8 or 16-bit color depth. Best for logos, screenshots, UI mockups, anything with sharp edges or transparency.
JPG/JPEG — Joint Photographic Experts Group, 1992. Lossy compression based on DCT, no transparency, 8-bit color. Best for photographs with smooth gradients and many colors. File sizes 10-30% of equivalent PNG.

Convert PNG to JPG when: the source has no transparency, file size matters, the destination is photo-heavy (web, email, social). Don't convert when: there's transparency you need to preserve, the image has sharp edges (line art, screenshots) where JPG's artifacts will be visible.

How to Convert PNG to JPG (Step by Step)

Open the Convert Image tool. Visit /tools/image/convert-image.
Drop your PNG (or multiple PNGs). The tool accepts batches.
Pick JPG as output format. Set quality if you want fine control — 85 is the sweet spot for most photos.
Pick the background color that replaces transparent pixels (white is default; black, gray, or any hex color also works).
Click Convert. Each PNG is converted to JPG locally in your browser. Download the result.

Conversion-Specific Tips

How to convert PNG to JPG without losing quality

“Without losing quality” is technically impossible — JPG is lossy by definition, so any conversion adds compression artifacts. But you can minimize the loss by setting JPG quality to 95 or higher. The file will still be 30-50% smaller than the PNG, with artifacts only visible under magnification. For archival copies, keep both; for web delivery, JPG-95 is usually the right tradeoff.

How to batch convert PNG to JPG online

Drop all your PNGs into Convert Image at once — the tool handles batches up to a few hundred files. Each is converted individually with the same quality setting; results download as a zip (or individually if you prefer). Good for converting a folder of 100 product photos in one shot.

When to convert PNG to JPG (and when not to)

Convert when the source is a photograph and you need smaller files (web delivery, email attachment, storage savings). Don't convert when: the source has transparency (you'll lose the alpha channel to a flat background color); the source is a screenshot of UI (JPG's blocky compression looks bad on flat-color regions); the source has sharp text overlays (JPG smears the edges).

How JPG Quality Settings Affect Your Output

JPG quality is a number from 1 to 100 that controls how aggressive the lossy compression is. The relationship between quality and file size isn't linear:

Quality 100: Largest file, minimal artifacts. Still NOT lossless (JPG itself is lossy by design); just the highest preserved fidelity.
Quality 90-95: Visually identical to quality 100 for most photos, ~30% smaller files. The sweet spot for archival JPG.
Quality 80-85: Visible artifacts only under heavy magnification. Standard for web delivery — Instagram, Facebook, most CDNs target this range.
Quality 60-75: Acceptable for small-screen / thumbnail use. Larger artifacts visible in skies and skin tones.
Quality below 50: Heavy artifacts, visible blocking, color bleeding. Rarely used outside extreme size constraints.

PDFFlare's Convert Image lets you set the quality slider explicitly so you can pick the right tradeoff for your use case. For most workflows, quality 85-90 is the right default.

Going the Other Way: JPG to PNG

Converting JPG to PNG doesn't restore lost quality — once an image is JPG, the artifacts are baked in. PNG-encoding the JPG just makes the file bigger without making the image any better. So why would you convert JPG to PNG?

You need to add transparency.JPG doesn't support it; saving as PNG opens up the alpha channel for editing.
You're passing through a PNG-only pipeline. Some tools (older design software, specific export workflows) only accept PNG input.
You want lossless re-saves.Once in PNG format, subsequent edits don't add JPG recompression artifacts.

The conversion is the same flow in PDFFlare — drop the JPG, pick PNG as output. Note that the resulting PNG will be larger than the JPG, sometimes 5-10x.

Common Mistakes

Converting a transparent PNG to JPG and losing the transparency.The transparent pixels become whatever background color you set (default white). Always check before converting that transparency isn't needed.
Converting screenshots to JPG. JPG's artifacts on text and UI are obvious; keep screenshots as PNG.
Re-converting repeatedly. JPG → PNG → JPG re-introduces JPG artifacts on each round. Convert once when needed; archive the original.

Privacy: Local Conversion

PDFFlare's Convert Image runs entirely in your browser — the WebAssembly codecs handle PNG and JPG encoding/decoding locally without uploading. Important when converting personal photos, screenshots containing private info, or product photos with competitive sensitivity.

Related Tools

Convert Image — convert PNG ↔ JPG ↔ WebP ↔ AVIF ↔ HEIC.
Compress Image — fine-tune file size after conversion.
Resize Image — resize before converting if dimensions matter.
Crop Image — trim before converting to save processing time.

Wrapping Up

Convert PNG to JPG when the source is a photograph, you don't need transparency, and file size matters. Convert JPG to PNG when you need to add transparency or pass through a PNG-only pipeline. For all other cases, keep the source format. PDFFlare's Convert Image tool handles both directions in your browser, with batch support and quality control.