When converting HEIC to JPG or PNG, many people wonder: which one should I choose? The short answer is "photos → JPG, logos and screenshots → PNG" — but understanding why helps you make the right call every time.
Key Differences Between JPG and PNG
| JPG | PNG | |
|---|---|---|
| Compression | Lossy | Lossless |
| File size | Small | Large |
| Quality loss | Yes (degrades with each save) | No |
| Transparency | Not supported | Supported |
| Best for | Photos | Logos, illustrations, screenshots |
Lossy vs. Lossless Compression
JPG (lossy compression): Reduces file size by permanently discarding image data that's difficult for the human eye to notice. Every time you save a JPG, a small amount of quality is lost — and that loss accumulates over multiple saves. Artifacts appear most visibly around high-contrast edges and fine text, producing a characteristic blur sometimes called "mosquito noise."
PNG (lossless compression): Compresses the image while retaining all data. No matter how many times you save it, quality never degrades. The trade-off is a significantly larger file size.
Choosing by Use Case
Photos → JPG
Landscape shots, portraits, food photos, and other everyday photos taken on your iPhone are well-suited to JPG.
- Smaller file sizes save storage and bandwidth
- Photos have many colors, so JPG compression artifacts are less noticeable
- Works great for social media, websites, and printing
JPG quality can be set from high (less compression) to low (more compression). Use high quality for printing or archiving, standard for social media and email, and light for web publishing or messaging.
Logos, Icons, and Illustrations → PNG
Images with text, sharp lines, or flat shapes look much better as PNG.
- Hard edges and fine lines stay crisp — no blurring around text
- Supports transparent backgrounds (great for logos used over different colors)
- Can actually produce smaller files than JPG for images with few distinct colors
Screenshots → PNG
Screen captures belong in PNG. Screenshots contain a lot of text and fine lines that become noticeably blurry when saved as JPG, making them hard to read.
A Third Option: WebP
WebP is a modern format developed by Google that sits between JPG and PNG. It produces smaller files than JPG while also supporting transparency like PNG. It's increasingly used for web publishing, though some older software may not support it. FileConv can convert to WebP as well.
Quality Settings When Converting
When converting to JPG with FileConv, you can choose from three quality levels:
| Setting | Compression | Typical file size | Best for |
|---|---|---|---|
| High | Low | 3–5 MB | Printing, archiving |
| Standard | Medium | 1–2 MB | Social media, email |
| Light | High | Under 500 KB | Web publishing, messaging |
The visual difference between Standard and High is barely perceptible on screen. Use Light for anything that doesn't need to be printed.
Which Format for HEIC Conversions?
For photos taken on an iPhone, JPG is the right choice in most cases.
- Photos look great at JPG quality
- File sizes are dramatically smaller than PNG (the same photo in PNG can be 3–5× larger)
- Works across web, email, and print
Only choose PNG if you specifically need a transparent background, or if the image contains a lot of text or graphics where sharpness matters.
Summary
- Photos and everyday snapshots → JPG (Standard or High quality)
- Logos, icons, images needing transparency → PNG
- Screenshots and documents → PNG
- Web publishing → WebP (or JPG at Light setting)
- Not sure? → JPG (High quality) works fine in most cases
Real-World File Size Comparison
Here's a practical example based on a typical iPhone photo (original HEIC: 2.1 MB) converted with FileConv:
| Format & Setting | File Size | Best For |
|---|---|---|
| JPG High (0.95) | ~3.8 MB | Printing, archiving |
| JPG Standard (0.80) | ~1.5 MB | Social media, email |
| JPG Light (0.60) | ~700 KB | Web, messaging |
| PNG | ~8–12 MB | Only when transparency is needed |
| WebP | ~1.2 MB | Web publishing |
Converting a photo to PNG typically produces a file 4–6× larger than the original HEIC. For photos, there's almost never a reason to choose PNG.
JPG vs. PNG vs. WebP: Full Comparison
| JPG | PNG | WebP | |
|---|---|---|---|
| Compression | Lossy | Lossless | Lossy or lossless |
| File size | Medium | Large | Small |
| Transparency | ✗ | ✓ | ✓ |
| Animation | ✗ | ✗ (APNG only) | ✓ |
| Compatibility | Universal | Universal | Modern browsers & OS |
| Best for | Photos | Logos, illustrations | Web publishing |
WebP offers the best balance of file size and quality, but older Windows apps and print services may not accept it. For emailing, printing, or posting to marketplaces, JPG remains the safest choice.
Frequently Asked Questions
Does re-saving a JPG reduce quality?
Yes. Every time you save a JPG, it is re-compressed, which introduces a small amount of additional quality loss. Over multiple saves, this accumulates. If you plan to edit an image repeatedly, work in PNG or another lossless format and export to JPG as a final step.
Should I use JPG or PNG when posting to social media?
Most social platforms (Instagram, X/Twitter, etc.) re-compress images using their own algorithms when you upload them, regardless of your format choice. The end result is similar either way. Since JPG files are smaller and upload faster, JPG is generally preferred for social media.
Does converting JPG to PNG improve quality?
No. If a JPG already has compression artifacts, converting to PNG preserves those artifacts exactly — it doesn't restore lost detail. The benefit of PNG is that it won't degrade further. Converting a JPG to PNG just increases file size with no quality gain.