Stays on this device
The public path encodes in your browser. The file is not uploaded and is not stored.
A private image optimizer that runs in your browser
SEIRO Image Optimizer is a free tool from SEIRO. Drop a HEIC, JPEG, PNG, WebP, AVIF, or JPEG XL file on the home page. Encoding happens in this tab. The file is not uploaded and is not stored. Output is MozJPEG, WebP, AVIF, OxiPNG, JPEG XL, or QOI, with the same style of settings as Squoosh, up to 15 MB.
No media store
There is no bucket and no new table. If you need the file later, download it.
Free to use
No account for the public tool. No paid plan. API access is requested, not sold as a self-serve key.
Who makes it
SEIRO builds operator tools. Desk is the internal product. This site, media-optimizer.seiro.io, is the public image optimizer. HTTP API and MCP require an account — see the API page.
How the public tool works
Open the home page, drop or paste an image, pick a codec, and download. Crop, resize, reduce palette, rotate, flip, flatten, and sharpen are optional. Each codec has its own quality, effort, and advanced settings. The preview split compares the original and the result in this tab.
Browser encode vs the SEIRO encoder
| Fact | Public (this tab) | SEIRO encoder |
|---|---|---|
| Upload | No | Yes, after Desk sign-in |
| Storage | None | None |
| Input | HEIC, JPEG, PNG, WebP, AVIF | HEIC, HEIF, JPEG, PNG, WebP, AVIF, GIF, TIFF, SVG |
| Output | JPEG, PNG, WebP, AVIF | JPEG, PNG, WebP, AVIF |
| Who | Anyone | SEIRO people with a Desk account |
What it does not do
- It does not keep a gallery or cloud album.
- It does not enlarge an image past its source pixels.
- It does not accept files over 15 MB.
- There is no public API key. Request access from Sign in → I don't have an account. Details are on the API page.
Questions
What is SEIRO Image Optimizer?
A free tool from SEIRO that optimizes and converts images in your browser. Drop a HEIC, JPEG, PNG, WebP, AVIF, or JPEG XL file on the home page. Output is MozJPEG, WebP, AVIF, OxiPNG, JPEG XL, or QOI.
Does this image optimizer upload my file?
No. The public path encodes in this tab. The file is not uploaded and is not stored. Close the tab and the bytes are gone.
Is SEIRO Image Optimizer free?
Yes. The public optimizer has no account and no paid plan. HTTP API, MCP, and batch encode stay behind a Bearer for approved teams.
Which formats can I convert?
Input is HEIC, JPEG, PNG, WebP, AVIF, or JPEG XL. Output is MozJPEG, Browser JPEG, WebP, AVIF, OxiPNG, Browser PNG, JPEG XL, or QOI. Crop, resize, reduce palette, rotate, flip, and per-codec settings match a Squoosh-class editor. 15 MB max.
Can I convert HEIC in Chrome?
Yes. Safari and many iOS browsers decode HEIC natively. Chromium loads a local decoder the first time you drop HEIC. The file still does not leave this tab. HTTP and MCP also accept HEIC.
Does the image leave my browser?
No, unless you are signed in and choose Encode on the SEIRO encoder. That path is for SEIRO people with a Desk account. The encoder still does not store the file.
How do I use the API or MCP?
The API page lists HTTP and MCP capabilities. An account is required. There is no public API key. Open Sign in, then I don't have an account. Integration docs appear after sign-in.
Who operates media-optimizer.seiro.io?
SEIRO, a software development company in Barcelona that builds custom software, mobile apps and AI automation. SEIRO uses this optimizer on its own projects and keeps it free.