TinyPNG's Limitations Explained
TinyPNG is genuinely good at what it does. It uses perceptual colour reduction (a technique called quantisation) combined with metadata stripping to achieve significant compression on PNG files — often 60–80% reduction. It also compresses JPEG files effectively. The quality at its default compression settings is well-regarded among web developers.
The problem is the free tier's 20-image-per-day limit. For a developer building or updating a website, 20 images can be exhausted in minutes. For a photographer or content creator processing a shoot, it is a constant friction point. TinyPNG's paid tiers or API access remove the limit, but the cost adds up for individual users.
Comparison Table: TinyPNG vs Alternatives
| Feature | TinyPNG | Squoosh | ToolMasta |
|---|---|---|---|
| Free tier limit | 20 images/day | Unlimited | Unlimited |
| Signup required | No (free tier) | No | No |
| Supported input formats | PNG, JPEG, WebP | PNG, JPEG, WebP, AVIF, BMP, GIF, TIFF | PNG, JPEG, WebP, GIF, BMP |
| WebP output | Yes | Yes | Yes |
| Quality control | Fixed algorithm | Granular slider | Quality slider |
| Batch processing | Yes (limited) | Single file only | Yes, unlimited |
| Processing location | Server-side | Browser (client-side) | Browser / server |
| Images stored on server | Temporarily | No (local) | No |
| Max file size | 5MB (free) | No limit | No stated limit |
| Resize on compress | No | Yes | Separate resize tool |
Tool-by-Tool Review
TinyPNG / TinyJPG
TinyPNG's core compression algorithm is genuinely excellent. For PNG files especially, it uses lossy colour quantisation (reducing to a more limited but perceptually similar palette) combined with lossless metadata stripping. The results are typically very good, with no visible quality degradation at its default settings.
The 20/day free limit is the only significant constraint. If you only compress images occasionally, TinyPNG is a solid choice. If you regularly need to process more than 20 images, you need an alternative.
Squoosh (by Google)
Squoosh is a browser-based image compression and conversion tool developed by the Google Chrome team. It runs entirely client-side using WebAssembly, meaning your images never leave your device — a significant privacy advantage.
Squoosh offers the most granular control of any free tool: you can choose from multiple compression codecs (MozJPEG, OxiPNG, AVIF, WebP, OptiPNG), adjust every parameter, and see a real-time side-by-side quality preview. For power users who want maximum control, Squoosh is excellent.
The limitation is that Squoosh processes only one image at a time. There is no batch processing mode. For single-image compression with fine-tuned control, it is arguably the best free tool available. For batch processing, it is the wrong choice.
ToolMasta Image Compressor
ToolMasta's free image compressor combines the two things the above tools individually excel at: unlimited processing and batch support. You can upload and compress multiple images at once with no daily limits, no account creation, and no file stored on servers.
Supported input formats include JPEG, PNG, WebP, GIF, and BMP. Output format can be selected independently of input format, meaning you can convert and compress simultaneously — for example, uploading PNG files and outputting compressed WebP versions in a single step.
The quality slider lets you set the target compression level, and the tool shows you the before-and-after file sizes so you can gauge the compression ratio. For web workflows where you need to process multiple images quickly, ToolMasta is the most practical option.
Which Tool Should You Use?
The right tool depends on your workflow:
- Occasional use, 1–20 images per day: TinyPNG remains an excellent choice for its consistent output quality.
- Power user, single images, privacy-sensitive: Squoosh's client-side processing and granular controls are unmatched.
- High volume, batch processing, no signup: ToolMasta is the best choice — unlimited, batch-capable, and no storage of your files.
For a deeper understanding of why image compression matters for website performance, read our comprehensive guide: How to Compress Images for Web Without Losing Quality. For choosing the right format before compressing, see our PNG vs JPG vs WebP comparison.
Try It Free — No Signup Required
Compress unlimited images with no daily caps. Supports JPEG, PNG, WebP, GIF, and BMP. Free, private, no watermarks.
Compress Images Free