Compressing a photo shouldn't require creating an account first. Most of the well-known options actually don't — here's which ones let you skip signup entirely, and where the line is if you need more than the basic free use.
Why this even needs clarifying
Plenty of "free" tools quietly require an account once you go past a small initial batch, or gate features like batch download behind a signup wall. None of that is necessarily unreasonable — but if you just want to compress one photo right now, it's worth knowing upfront which tools let you do that immediately versus which ones ask for an email address first.
The options
Kroma Lab — No account required at any point for the free tier. Compress as many images as you want; the only friction is a processing wait that grows the longer you're in a session, removable with the paid Unlimited plan (also no free-tier signup requirement).
Squoosh — No account, ever, for any part of the tool. Fully manual compression controls, one image at a time, entirely in your browser.
TinyPNG — The core web compressor works without signing up for an initial batch (up to 20 images, 5MB each). An account becomes relevant if you want to go beyond that or use their API/CDN products.
CloudConvert — Works without an account for occasional, smaller conversions; heavier or repeated use requires signing up for credits.
iLoveIMG — Basic compression works without an account; their Premium tier (batch processing, advanced features) requires signing up.
Quick comparison
| Signup required for basic use? | Upload required? | Batch processing without signup? | |
|---|---|---|---|
| Kroma Lab | No | No | Yes |
| Squoosh | No | No | No (one image at a time) |
| TinyPNG | No (up to 20 images/batch) | Yes | Limited (20-image cap) |
| CloudConvert | No (occasional use) | Yes | Limited by free allowance |
| iLoveIMG | No (basic tier) | Yes | Limited (Premium for more) |
Which one to actually use
Want to compress and never think about an account, ever, with no upload either? Kroma Lab or Squoosh. Comfortable with an upload step and just need a compressor you already know? TinyPNG's no-signup batch is generous enough for occasional use. Need compression as part of a broader image-editing task? iLoveIMG's basic tier covers that without requiring signup either.
The common thread across nearly all of these: signup requirements tend to show up around volume and advanced features, not basic one-off compression. If you're just trying to shrink a photo right now, you almost certainly don't need to create an account to do it.
Try it directly: compress a photo with no account, no upload, and no limit on how many you process.