Convert PNG to ICO Online — For Windows Icons & Favicons

Generates 6 resolution layers (16/32/48/64/128/256px) with perfect transparency.

Drop up to 50 files at once — no install, no sign-up required.

Drop PNG Files Here

25 MB per file Up to 50 files 3 parallel conversions 1 credit each

Encrypted EU Servers Auto-delete 1h

⚡ Median PNG → ICO time (last 10k jobs): 113ms

How it works

1 · Drop your files
Drag & drop or choose PNG files. Upload 256×256px resolution PNG for best results. No account required on Free—paid plans unlock bigger batches, higher limits, and priority queues.
2 · We convert securely
Processed on our dedicated servers. Encrypted in transit & at rest. We never store filenames—only file types & sizes for accounting. We never train AI models on uploads.
3 · Download & auto-delete
Grab your ICO in seconds. Files delete automatically after 1 hour. Delete anytime after downloading with one click.

About PNG →

PNG (Portable Network Graphics) provides lossless compression with full alpha channel transparency, making it the go-to format for graphics, screenshots, and images requiring pixel-perfect fidelity. Created in 1996 as a patent-free GIF alternative, PNG uses DEFLATE compression and supports both indexed color (PNG-8) and truecolor with alpha (PNG-24/32). Files are 3-10× larger than equivalent JPEGs but preserve every pixel exactly.

Learn more: PNG on Wikipedia

PNG is universally supported and ideal for logos, UI elements, diagrams, and any content where transparency or lossless editing matters. For photographic content without transparency needs, JPEG typically offers better compression efficiency.

About ICO

ICO is the standard format for website favicons—the small icons shown in browser tabs, bookmarks, and address bars. An ICO file can bundle multiple resolutions (16×16 up to 256×256 pixels) so browsers choose the best size for each context. Modern ICO files store images as PNG internally, preserving full transparency and sharp edges.

Learn more: ICO on Wikipedia

Originally created by Microsoft for Windows application icons, ICO remains the most widely supported favicon format across all browsers. While newer options like SVG favicons exist, ICO guarantees compatibility with every browser and platform.

Frequently Asked Questions

Do you preserve transparency?

Yes. All six layers (16px, 32px, 48px, 64px, 128px, 256px) are encoded as 32-bit RGBA PNG inside the ICO container, preserving full alpha channel transparency.

What if my PNG isn't square?

We center-crop rectangular images to a square before generating all six resolutions. This avoids distortion and ensures your icon looks correct in Windows. If you need precise control over cropping, prepare a square PNG at 256×256 or larger before uploading.

What's the recommended input size?

Upload at least 256×256 for best quality across all ICO layers. Smaller PNGs will be upscaled automatically, but may appear less sharp. Higher resolution source images (512×512 or larger) work great—we'll downsample cleanly to the 6 standard sizes.

Can I use ICO files for website favicons?

Yes. ICO remains the most compatible favicon format, especially for older browsers and Windows desktop shortcuts. Modern browsers also support PNG and SVG, but ICO ensures universal compatibility. Upload your ICO as favicon.ico in your website root.

What are the limits for this converter?

Tier	Max File Size	Max Files/Batch	Parallel Processing
Free	25 MB	50 files	3 at once
Pro	200 MB	200 files	6 at once
Business	1024 MB	1000 files	10 at once

Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →

How are credits calculated for this conversion?

Cost: 1 credit per 25 MB

How it works:

Files up to 25 MB: 1 credit (minimum)
26-50 MB: 2 credits
51-75 MB: 3 credits
76-100 MB: 4 credits
Over 1000 MB: 40 credits (maximum cap)

Example: A 5 MB image = 1 credit. A 95 MB image = 4 credits.

Why per-megabyte? Larger files require more resources (processing, bandwidth, storage).

What are my daily and monthly credit limits?

Credit allocations vary by account tier:

Tier	Daily Limit	Monthly Limit
Free	50 credits/day	—
Pro	—	10,000 credits/month
Business	—	30,000 credits/month

Daily credits (Free tier, including guests) reset every day at midnight UTC. Monthly credits (Pro & Business) reset on your billing cycle date.

Note: With 1 credit per 25 MB, images under 25 MB cost 1 credit each. Pro users can convert 10,000 images per month.

Answers at a Glance

Quick answers to common questions.

Choose Your Plan

Limits shown for PNG to ICO conversion. One subscription unlocks the entire Tools.FAST Network. Plans cover Convert.FAST, Compress.FAST, PDF.FAST (soon), and all future tools.

Monthly Annual 4 Months Free

Free

For occasional personal use

25 MB per file
50 files per batch
3 parallel conversions
50 credits/day
Standard priority
Email support

No sign-up required. Create an account for your own credit pool.

Popular

Pro

$9 /month

For independent work

200 MB per file
200 files per batch
6 parallel conversions
10,000 credits/month across Tools.FAST
High priority
Email & chat support
One subscription for the entire Tools.FAST network

Business

$19 /month

1 seat

For production scale

1 GB per file
1000 files per batch
10 parallel conversions
30,000 credits/month across Tools.FAST
Add seats to invite team members
Highest priority
Priority email & chat support
One subscription for the entire Tools.FAST network

How Credits Work

Usually 1 credit per conversion. Exact cost shown before you start.
Credits refresh monthly on your billing cycle.
Unused credits roll over, capped at your plan's monthly amount.
One subscription, all sites. Works across Convert.FAST, Compress.FAST, and future tools.

View all converter limits by tier →

What's New in PNG to ICO

Latest improvements to this converter

Last updated December 18, 2025

Dec 18, 2025

Initial launch of PNG to ICO converter with 6-layer Windows icon output and transparency preservation.