JPG to PNG Converter

JPG to PNG Converter

JPG → PNG Converter — Complete Guide & FAQs

This standalone guide explains how to use the JPG → PNG Converter (blue theme). It’s designed for documentation, help pages, or direct instructions for users.

Quick Overview

What it does: Converts JPG/JPEG images to PNG format entirely in your browser — no upload needed.

Key features:

  • Batch conversion
  • Drag & drop support
  • Resize (width/height)
  • Preserve aspect ratio
  • Toggle transparent background
  • Custom background color fill
  • Filename pattern support
  • ZIP archive for batch downloads
  • Metadata (EXIF) removal

Limits: Maximum file size: 25 MB per image (due to client-side performance).

Step-by-Step Guide

1) Upload Files

  • Drag & drop JPG/JPEG files into the upload area, or click Choose files.
  • Multiple file selection is supported.
  • Files over 25 MB are skipped with a warning.

2) Review Thumbnails

  • Uploaded files appear as thumbnails with filename and size.
  • Use the checkbox on each thumbnail to include or exclude it from conversion.
  • Use Remove to delete a file from the list.

3) Configure Options

  • Resize (pixels): Enter width and/or height. Leave both blank to keep original size.
  • Preserve aspect ratio: On by default; prevents stretching.
  • Transparent background: Keeps empty areas transparent. Disable to fill with a color.
  • Background color: Enter a hex code (e.g., #ffffff) when transparency is disabled.
  • Filename pattern: Use {name} to insert the original filename (without extension). Example: {name}-png → photo-png.png.
  • Create ZIP: Bundle all converted PNGs into one ZIP file.
  • Strip metadata: On by default; removes EXIF and other metadata.

4) Convert & Download

  • Click Convert Selected to PNG.
  • If ZIP is enabled, you’ll download a single archive. Otherwise, each file downloads individually.
  • All processing happens in your browser; nothing is uploaded to a server.

Detailed Explanation of Options

Resize Rules:

  • Leave width/height blank → keep original size.
  • Enter one dimension with aspect ratio on → the other dimension adjusts automatically.
  • Enter both with aspect ratio on → image scales proportionally to fit.

Transparency & Background Color:

  • With transparency enabled, PNG uses an alpha channel (transparent).
  • With transparency disabled, the background is filled with your chosen color.

Filename Pattern:

  • {name} inserts the original filename.
  • Example: logo_{name} + photo.jpg → logo_photo.png.

ZIP vs. Individual Downloads:

  • ZIP is convenient for large batches.
  • ZIP generation uses more memory, so keep batch sizes reasonable.

Tips & Best Practices

  • Logos & graphics: PNG is ideal — lossless quality + transparency.
  • Photos: PNG files are usually larger; use JPG when file size matters.
  • Alternative formats: If you want smaller lossless images, try WebP (not built into this tool).
  • Batch size: Keep under ~50 images per conversion for smoother performance.
  • If conversion fails: Try resizing to smaller dimensions or reducing the number of files.

Troubleshooting

  • Nothing happens when clicking Convert: Ensure at least one file is selected (checkbox checked).
  • Images look stretched: Check width/height settings and aspect ratio.
  • Converted PNGs are very large: Normal for photos — PNG is lossless.
  • Need EXIF metadata preserved: Not possible with this tool (canvas conversion strips EXIF). Use a server-side solution if metadata is required.

FAQs

Q: Are my images uploaded?
A: No. Everything happens locally in your browser.

Q: Can I convert PNG → JPG?
A: This tool is for JPG → PNG only. Other formats (PNG → JPG, WebP, etc.) require small code changes.

Q: What browsers are supported?
A: Modern browsers: Chrome, Edge, Firefox, Safari. Mobile browsers also work but may be slower.

Q: Is there a size limit?
A: Yes — around 25 MB per file for stable performance.

Q: Do converted files keep EXIF/GPS data?
A: No. Metadata is stripped during conversion.

Q: Why are PNGs bigger than JPGs?
A: PNG is lossless; JPG is compressed. Photos usually grow larger when converted to PNG.

Q: Can I run this on a server?
A: Yes, with libraries like ImageMagick, Sharp (Node.js), or Pillow (Python). This tool is intentionally client-side for privacy.

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