CodeKitHubWhat Is This Tool?
JPG is the compact lossy format photos usually come in; PNG is a lossless format that many applications, forms and pipelines require. Converting JPG to PNG re-encodes the image losslessly — the pixels are preserved exactly as they are in the JPG, and no further quality is lost no matter how many times the PNG is re-saved.
One honest limitation to know: conversion cannot restore detail the JPG already discarded. A JPG converted to PNG looks identical to the JPG — not better — and the file usually gets larger, because lossless storage costs more bytes.
Why Use It?
- Meet PNG-only requirements of forms, apps, and asset pipelines in seconds.
- Lossless from here on: edit and re-save the PNG repeatedly with zero generational loss.
- Batch conversion with per-file downloads.
- Local and private — photos are never uploaded.
- Free, no watermark, no account.
How to Use
- Click the box or drag JPG files onto it.
- Conversion starts immediately — each result shows a preview and its size.
- Click Download next to each PNG.
Example
Input
photo.jpg — 850 KBOutput
photo.png — 2.9 MB, pixel-identicalPNG is bigger because it stores every pixel losslessly — expected and normal.
Common use cases
- A design tool, print service, or asset pipeline that only accepts PNG uploads, even though your source photo is JPG.
- Preparing a JPG for an image editor before applying edits that will be saved repeatedly — converting first avoids compounding JPG generation loss on every save.
- Adding a JPG to a project that requires PNG for consistency with other lossless assets (icons, logos) already in the same folder or system.
- Feeding a JPG into a tool or script that specifically checks for a .png extension or PNG file signature.
What this conversion does and doesn't fix
It's worth being direct about this: converting a heavily-compressed, blocky JPG to PNG does not remove the blockiness — PNG's lossless encoding faithfully preserves every pixel, compression artifacts included. If a JPG already looks bad, the PNG version will look exactly as bad, just in a larger file. The value of this conversion isn't visual improvement; it's stopping further degradation and satisfying format requirements that specifically call for PNG.
JPG to PNG vs PNG to JPG
These two conversions solve opposite problems and are easy to mix up. JPG to PNG (this tool) is almost always about meeting a format requirement or stopping further generation loss — it doesn't save space and often costs more of it. PNG to JPG (the reverse direction) is usually about saving space on a photographic image that was mistakenly saved as PNG, and it does reduce file size, at the cost of the small, usually invisible quality loss that comes with any lossy re-encoding. Picking the wrong direction for your actual goal — converting a photo to PNG expecting it to shrink, for instance — is the most common point of confusion between the two tools.
Frequently Asked Questions
Why is the PNG larger than my JPG?
Because PNG stores pixels losslessly while JPG compresses aggressively. For photos, 2–5× larger is typical. You're trading size for a format guarantee — the right trade when PNG is required or when you'll edit the image further.
Does converting to PNG improve quality?
No — it preserves exactly the quality the JPG has, including any JPG artifacts. What it does guarantee is that no additional quality is lost from now on, which matters if the image will be edited and re-saved.
Will the PNG have transparency?
It supports transparency as a format, but since JPG has none, the converted PNG is fully opaque. To create transparency you'd need an image editor with background removal.
When should I use PNG instead of JPG?
PNG: screenshots, logos, graphics with text or sharp edges, images needing transparency, and files that will be edited repeatedly. JPG: photos for viewing or sharing. Wrong-direction conversions waste space without benefit.
Is anything uploaded during conversion?
No. Your browser decodes the JPG and re-encodes the PNG locally via the canvas API. The tool works offline once the page has loaded.
Does converting JPG to PNG improve quality?
No. JPEG compression discards detail permanently; converting to PNG preserves the pixels exactly as they are now but cannot restore what was lost, and the PNG file will usually be several times larger. Convert when a form or workflow specifically requires PNG, or before edits that need a lossless intermediate — not to "upgrade" a photo.