Best Free Online Image Converters in 2026: Complete Comparison

Need to convert images between formats? We've tested dozens of online converters to find the best ones. Here's your complete guide.

Quick Comparison Table

Tool	Formats	Privacy	Speed	Batch	Ads	Limits
Anything.tools	8+	✅ Local	⭐⭐⭐⭐⭐	✅	❌	None
Squoosh	6	✅ Local	⭐⭐⭐⭐	❌	❌	1 file
CloudConvert	100+	❌ Upload	⭐⭐⭐	✅	❌	25/day
Convertio	100+	❌ Upload	⭐⭐⭐	✅	✅	100MB
iLoveIMG	5	❌ Upload	⭐⭐⭐⭐	✅	✅	15 files
TinyPNG	2	❌ Upload	⭐⭐⭐⭐	✅	❌	20/upload

What We Tested

We evaluated each converter on:

Format support - How many formats can it handle?
Privacy - Does it upload files to servers?
Speed - How fast is the conversion?
Batch processing - Can it convert multiple files?
Quality - Does output match expected quality?
User experience - Is it easy to use?
Limits - Any file size or count restrictions?

Detailed Reviews

1. Anything.tools (Our Tool)

Best for: Privacy-conscious users, HEIC/AVIF conversion

Formats: JPG, PNG, WebP, AVIF, HEIC, BMP, GIF, ICO

How it works: 100% browser-based. Your images never leave your device. Uses JavaScript to process images locally.

Pros:

✅ Complete privacy (no uploads)
✅ Fast (no server wait)
✅ Unlimited conversions
✅ No registration required
✅ Clean, ad-free interface
✅ Batch processing

Cons:

❌ Limited to common formats
❌ Depends on browser capabilities

Best for: Everyday conversions, HEIC photos, privacy needs

Try Anything.tools Image Converter →

2. Squoosh (by Google)

Best for: Visual quality comparison, single image optimization

Formats: JPG, PNG, WebP, AVIF, JXL (experimental)

How it works: Browser-based with advanced compression controls. Shows before/after comparison.

Pros:

✅ Visual quality slider
✅ Side-by-side comparison
✅ Advanced compression settings
✅ No uploads (local processing)
✅ Free, no account needed

Cons:

❌ One image at a time
❌ No batch processing
❌ Can be slow for large images

Best for: Photographers optimizing individual images

3. CloudConvert

Best for: Rare format support, API integration

Formats: 200+ formats (not just images)

How it works: Uploads files to cloud servers for processing. Offers API for developers.

Pros:

✅ Massive format support
✅ Reliable processing
✅ API access
✅ Good quality output
✅ No ads

Cons:

❌ Files uploaded to servers
❌ 25 free conversions/day
❌ Slower (network required)
❌ Requires account for more

Best for: Rare formats, developer integration

4. Convertio

Best for: Wide format support with basic needs

Formats: 300+ formats across all file types

How it works: Upload-based converter with wide compatibility.

Pros:

✅ Many formats
✅ Simple interface
✅ Email delivery option

Cons:

❌ Files stored on servers
❌ 100MB limit (free)
❌ Ads in free version
❌ Slow for large files
❌ Limited daily conversions

Best for: Occasional use with various formats

5. iLoveIMG

Best for: Quick basic conversions

Formats: JPG, PNG, GIF, WEBP, HEIC

How it works: Upload-based with focus on simplicity.

Pros:

✅ Very simple interface
✅ Additional editing tools
✅ Batch up to 15 images

Cons:

❌ Files uploaded to servers
❌ Limited formats
❌ Ads in free version
❌ Need premium for more features

Best for: Non-technical users wanting simplicity

6. TinyPNG / TinyJPG

Best for: Compression optimization (not format conversion)

Formats: PNG, JPG, WebP

How it works: Specializes in compression. Upload → smart compression → download.

Pros:

✅ Excellent PNG compression
✅ Smart lossy compression
✅ WordPress plugin
✅ API available

Cons:

❌ Not really a format converter
❌ Files uploaded
❌ 20 images per upload
❌ 5MB limit per image

Best for: WordPress users, PNG optimization

Privacy Comparison

Local Processing (Most Private)

These convert in your browser:

✅ Anything.tools
✅ Squoosh

Files never leave your device.

Server-Based (Uploads Required)

These send files to their servers:

⚠️ CloudConvert
⚠️ Convertio
⚠️ iLoveIMG
⚠️ TinyPNG

Files are typically deleted after processing, but privacy policies vary.

Speed Comparison

Test: Converting 10 JPG files (2MB each) to WebP

Tool	Time	Notes
Anything.tools	8 sec	Local, instant start
Squoosh	N/A	One at a time only
CloudConvert	45 sec	Upload + processing
Convertio	60 sec	Queue delays
iLoveIMG	35 sec	Decent upload speed