7 Best TinyPNG Alternatives in 2026 (Free, No Signup, Tested)

I have a confession. I used TinyPNG for years. It was the first thing I'd open when a client sent me a 6 MB hero image, and I needed it under 500 KB before lunch. It worked. It was simple. I never questioned it.

Then one day I was compressing screenshots that contained private client data — financial dashboards, internal reports — and a thought hit me: where are these files actually going?

The answer wasn't great. They're uploaded to TinyPNG's servers, compressed there, and then you download the result. For a stock photo, that's fine. For a screenshot of someone's bank dashboard? Not so much.

That moment sent me down a rabbit hole of testing every free image compressor I could find. I spent a week compressing the same batch of 20 test images — a mix of photos, screenshots, illustrations, and PNGs with transparency — across every tool worth trying.

Here's what I found.

Why People Leave TinyPNG

Let me be clear: TinyPNG is a good tool. But it has real limitations that add up:

5 MB file size cap on the free tier. Modern phone cameras produce 10-15 MB images regularly.

20 images per session. If you're optimizing a full website redesign with 80 product photos, that means four separate sessions.

Files are uploaded to their servers. Your images leave your device, get processed remotely, and then you download them back.

No quality slider. You get whatever compression level TinyPNG decides. There's no way to say "I want 85% quality" — it's all or nothing.

API is capped at 500 free compressions per month. After that, you're paying per image.

None of these are dealbreakers on their own. But together, they push a lot of people — especially developers, designers, and freelancers working with client files — to look for alternatives.

What I Tested

I compressed the same 20 images through each tool and measured three things:

1. File size reduction (percentage saved)

2. Visual quality (side-by-side comparison at 200% zoom)

3. Privacy (does the tool upload files to a server, or process them locally?)

Here are the seven tools that made the cut.

1. Alventra.io Image Compressor

Best for: People who want TinyPNG's simplicity with actual privacy.

This is the tool I ended up building after that client-data moment. It runs entirely in your browser using client-side JavaScript. Your images never leave your device — not even temporarily.

What I like:

• Quality slider from 10% to 100% — you control the tradeoff

• Batch compression with no file limit

• Side-by-side size comparison showing original vs. compressed

• Supports JPG, PNG, and WebP

• No account, no sign-up, no daily limits

What could be better:

• No AVIF or JPEG XL output yet

• No desktop app — browser only

Test results: A 4.2 MB JPEG compressed to 890 KB at 75% quality. Visually indistinguishable from the original at normal viewing size. At 200% zoom, very slight softening in background textures — exactly what you'd expect from lossy compression.

2. Squoosh (by Google Chrome Labs)

Best for: Developers who want pixel-level control over a single image.

Squoosh is the gold standard for technical image optimization. It's open source, built by Google's Chrome team, and runs entirely in your browser using WebAssembly.

What I like:

• Side-by-side preview with a slider is genuinely the best in class

• Supports every modern format: AVIF, WebP, JPEG XL, OxiPNG, MozJPEG

• Complete control over every compression parameter

• Works offline after initial load

What's limiting:

• One image at a time. No batch processing at all.

• The CLI tool was abandoned in 2023 and is no longer maintained

• The interface can be overwhelming if you just want to quickly shrink a photo

Test results: Excellent compression with MozJPEG. The same 4.2 MB JPEG hit 820 KB — about 8% smaller than most other tools. But I had to process each image individually, which took 15 minutes for 20 images.

3. ShortPixel

Best for: WordPress users who want a set-it-and-forget-it solution.

ShortPixel has a solid web compressor, but its real strength is the WordPress plugin. It automatically compresses images when you upload them to your media library.

What I like:

• Three compression modes: Lossy, Glossy (balanced), and Lossless

• WordPress plugin handles everything automatically

• Good bulk optimization for existing media libraries

• Results are consistently good across all three modes

What's limiting:

• Free tier caps you at 50 images per month (web) or 100 credits per month (plugin)

• Files are uploaded to ShortPixel's servers for processing

• The web tool caps files at 10 MB each

Test results: Glossy mode hit a nice sweet spot — 4.2 MB JPEG down to 940 KB with practically zero visible quality loss. Lossy mode went to 780 KB but introduced slight banding in gradient areas.

4. Compressor.io

Best for: People who work with GIFs and SVGs alongside photos.

Compressor.io stands out because it handles formats that most compressors ignore — GIF and SVG. If you're working with animated graphics or vector files, it's one of your only free options.

What I like:

• Supports JPEG, PNG, GIF, SVG, and WebP

• Lossy and lossless toggle

• Clean, simple interface

What's limiting:

• 10 MB file size cap

• Files are uploaded to their servers

• Free tier limits you to roughly 50 images per day

• No batch processing on the free plan — one file at a time

Test results: JPEG compression was solid — 4.2 MB down to 910 KB. Where it really shone was GIF compression: a 3.8 MB animated GIF dropped to 1.4 MB without losing any frames.

5. Optimizilla

Best for: Quick batch compression with a per-image quality slider.

Optimizilla is as straightforward as it gets. Upload up to 20 images, adjust the quality slider for each one, download them individually or as a ZIP. Done.

What I like:

• Per-image quality slider so you can fine-tune each file

• Batch up to 20 images at once

• No account required

• Download all as ZIP

What's limiting:

• Only JPEG and PNG — no WebP, no AVIF

• Images are uploaded to their servers

• Interface feels dated

• No metadata about savings percentage per file

Test results: Decent results. 4.2 MB JPEG down to 950 KB at default settings. The per-image slider is handy for hero images where you want higher quality vs. thumbnails where you can be more aggressive.

6. ImageOptim (Mac Only)

Best for: Mac users who want the best possible lossless compression.

ImageOptim is a native Mac app that runs multiple compression algorithms in parallel and picks the smallest output. It's lossless by default, meaning your images look identical — bit for bit in some cases.

What I like:

• Runs locally — nothing is uploaded anywhere

• Combines multiple algorithms (pngcrush, pngquant, zopfli, MozJPEG, and more)

• Strips EXIF data automatically (great for privacy)

• Drag and drop — dead simple

What's limiting:

• Mac only. No Windows, no Linux, no web version.

• Lossless compression means smaller savings — typically 20-40% vs. 60-80% with lossy tools

• No quality slider or format conversion

Test results: Lossless compression reduced the 4.2 MB JPEG to 3.1 MB. That's only 26%, but the image was bitwise identical. For photos, you'd want to enable lossy mode in settings to get bigger savings.

7. Browser DevTools (The Hidden Option)

Best for: Developers who are already in Chrome or Firefox.

This one surprises people. If you're a developer, you already have a capable image optimizer installed — your browser.

Open DevTools, go to the Application or Network tab, and you can save images in WebP format directly. Or use the Canvas API to re-export an image at a specific quality level. It's not a "tool" in the traditional sense, but it works.

What's limiting:

• Requires technical knowledge

• No batch processing without scripting

• Not practical for non-developers

The Verdict: Which One Should You Use?

Here's my honest recommendation after testing all of them:

The right tool depends on what you value most. If privacy matters — and it should — look for tools that process images in your browser, not on their servers. If batch speed matters, look for tools with no per-session caps.

And if you just want something that works without thinking about it? Honestly, that's what I built Alventra's Image Compressor to be. Drag, drop, done. Your files stay on your device.

One More Thing

Whatever tool you pick, run your website through Google PageSpeed Insights before and after compressing your images. The difference in your performance score will convince you this was worth the 10 minutes. I've seen sites jump from a 45 to an 85 just from image optimization alone.

Good images shouldn't slow down good websites.