The first time I opened TinyJPG, I had 150 event photos that needed to go into the company CMS. Each file was about 5MB. The CMS limit: 2MB per file. I tried renaming extensions, using Paint to resize — nothing worked well.

A friend recommended TinyJPG. Download, API key setup, drag in images, click compress. From installation to completing all 150 images: under 10 minutes. Output files averaged 400KB. No visible quality loss.

If this is your first time, these three steps are all you need.

01. Download and Install

Go to the download page and get the latest installer. Double-click to install. When you launch it, you’ll see three tabs: “Compress Tool”, “Watermark Tool”, and “Settings”.

No account registration needed. No login. Download and go.

02. Get Your Free API Key

TinyJPG uses the TinyPNG API for compression. You’ll need a free API key:

Go to TinyPNG Developer page
Enter your name and email, submit
Check your email — the key will be sent to you
In TinyJPG, go to “Settings” → “API Key Management” → “Add Key”
Paste and save

Each email gives you 500 free compressions per month. Need more? Register multiple email accounts — see the multi-key management guide.

👉 Haven’t downloaded yet? Get TinyJPG

03. Run Your First Compression

Switch to the “Compress Tool” tab
Click “Add Images” or drag files directly into the window
Select output format on the right panel (default: JPEG)
Choose “Fit” mode — scales proportionally by width, most common
Click “Start Compression”
Wait for the progress bar

Output files are saved to a compressed/ folder alongside your originals by default.

Quick Parameter Reference

Web images → Fit mode, width 1920px, JPEG Q85
E-commerce → Fit mode, width 1200px, JPEG Q80
Social media → Fit mode, width 1080px, JPEG Q90
Print → Original size, PNG or high-quality JPEG

Other Features at a Glance

Feature	Where to Find	One-Liner
Format conversion	Compress Tool → Output Format	Convert between 9 formats
Watermark	Watermark Tool tab	Image/text watermark, drag positioning
Batch rename	Compress Tool → Output Settings	Template variable renaming
Multi-key management	Settings → API Key Management	Break the 500/month limit

04. Things to Know

Stick to under 500 images per batch (API monthly quota consideration)
Minimize to system tray during compression — keep working
Auto-retry on network issues — no manual intervention needed
ICO and PDF formats don’t support watermarks (format limitation)

FAQ

01. Do I need my own API key? TinyJPG comes with 2 shared keys pre-configured. But shared keys have limited capacity — registering your own key is recommended for reliability.

02. Will compressed images look blurry? TinyPNG uses smart lossy compression that removes imperceptible color data. In most cases, there’s no visible difference.

03. What image formats are supported? Input: JPG, PNG, WebP, AVIF, BMP, GIF, TIFF. Output: 9 formats including ICO and PDF.

04. Can I use it on multiple computers? Yes. TinyJPG is portable — copy the folder to another Windows PC and it works (you’ll need to configure API keys).

05. Is there a Mac version? Windows only at this point. Mac and Linux versions are not planned.

Summary

From download to first compression: under 10 minutes. TinyJPG is designed to be intuitive — no manual needed, no complex setup.

Get started: Download TinyJPG Compressor

First Time Using TinyJPG? From Download to Compressing 150 Images in Under 10 Minutes