CompareMeasured 2026-08-20
Compress image to 100KB, alternatives compared
Four sites that compress a photo to 100KB, checked for what they actually do rather than what they say they do.
This is our own tool for the same job: Compress image to 100KB.
What actually differs in this cluster
This is not a privacy comparison. Reading jpeg-optimizer.com's and image.pi7.org's compression JavaScript in full found no FormData, fetch or upload path in either one — both genuinely process the image with a canvas and hand back a Blob, exactly the claim this site makes about itself. Claiming a privacy edge over them would be false. The real difference in this cluster is ads and how much gets loaded around the tool: one site runs four AdSense placements and contradicts its own privacy claim in its own copy, another runs a full real-time-bidding ad stack, and a third defers its one ad until after your file is already compressed.
How we checked
- Each competitor was opened once in a real Chrome profile, not headless, with the extensions the site owner normally runs. That is a single sample from a single machine on 2026-08-20, not a repeated or automated audit.
- Whether a file gets uploaded was decided by reading the page itself: the DOM was checked for a <form> and its enctype and action, and the site's own served JavaScript was fetched and read in full, grepped for FormData, fetch, XMLHttpRequest and multipart. A page that ships no such code path anywhere is the strongest evidence available short of watching the actual network traffic; a page with a <form action=... enctype="multipart/form-data"> is stronger still, because no code reading is needed at all.
- Ad networks were identified from the hostnames of loaded scripts (googlesyndication.com, doubleclick.net, ezojs.com and similar), not from a subjective read of how the page looks.
- Anything taken from a site's own visible copy, such as a stated retention window or a pricing tier, is labelled as that site's claim below, never treated as verified fact.
- What this cannot tell you: whether the same site behaves the same way tomorrow, on a different page of the same tool, or for a visitor in a different region. It is a snapshot, not a monitor.
This snapshot is from 2026-08-20. Sites change their code without notice — treat every cell below as dated, not as a live status.
4 sites, checked one at a time
| Site | Uploads your file | Ads | Pricing |
|---|---|---|---|
| jpeg-optimizer.com | No — confirmed by reading its JS | Ezoic + AMP auto-ads | Free |
| image.pi7.org | No — confirmed by reading its JS | Ezoic, deferred until after compression | Free |
| 11zon.com | Unknown — site's own copy contradicts itself | Four AdSense placements | Freemium |
| simpleimageresizer.com | Unknown — leans toward yes per its own claim | The heaviest ad stack in this survey | Freemium with a real checkout |
jpeg-optimizer.com
- Uploads your file
- No — confirmed by reading its JS. Its full js/index.js (103 lines) was read: the only FormData use reads form field values locally, never sends them anywhere. Compression runs through a local compressImage() function per file and produces a Blob/createObjectURL() for download. Zero fetch() or XMLHttpRequest anywhere in the file.
- Ads
- Ezoic + AMP auto-ads. document.scripts includes ezojs.com/ezoic/sa.min.js (Ezoic ad mediation) and cdn.ampproject.org/v0/amp-auto-ads-0.1.js, plus a gatekeeperconsent.com consent-management script tied to Ezoic's ad flow.
- Pricing
- Free. Page states "our JPEG compressor is completely free"; no login or account UI.
- Where it beats us
- Compresses up to 20 images in one batch, and this specific URL is built around the 100KB target the same way this site's page is.
image.pi7.org
- Uploads your file
- No — confirmed by reading its JS. Its full static/js/img_compressor.js (57 lines) was read: no FormData, fetch, XMLHttpRequest, .ajax or multipart string anywhere. Output is built with URL.createObjectURL(blob), and the code contains a hard-coded status string, 'Compressed on your device. Nothing was uploaded.'
- Ads
- Ezoic, deferred until after compression. Loads ezojs.com/ezoic/sa.min.js and Ezoic's consent-manager scripts; the compressor JS itself calls ezstandalone.showAds(116) to render the ad inside the results popup only after compression finishes, not on page load.
- Pricing
- Free. No login, account or pricing UI encountered.
- Where it beats us
- The ad on this page is deliberately held back until after your file is compressed, so it does not sit between you and the tool the way it does on other sites in this list — worth crediting even while listing it as a competitor.
11zon.com
- Uploads your file
- Unknown — site's own copy contradicts itself. No <form> element; a hidden file input feeds the compressor. The small app.zon.min.js that could be read in full (4.3KB) is UI only — rating widgets, a feedback endpoint — and does not contain the actual compression logic, which loads some other way not found in this session. Notably, the site's own text says images are "processed securely and permanently removed from our servers" (implying server-side handling) while also shipping FileSaver.js, a client-side download library. That contradiction was recorded as unknown rather than resolved by guessing.
- Ads
- Four AdSense placements. document.scripts includes four separate pagead2.googlesyndication.com/adsbygoogle.js tags.
- Pricing
- Freemium. Nav has Log in / Sign up links distinct from the free compressor page; not explored further.
- What the site itself says
- claim"Every upload is processed securely and permanently removed from our servers." — the site's own claim, and the one site in this survey whose own copy directly states server-side processing rather than the more common "never leaves your browser" line.
- claim"4.6/5 rating, 305,481 votes" shown on the page — a self-reported figure, not independently verifiable.
- Where it beats us
- Claims unlimited batch size with no stated numeric cap, wider than the batch limits stated elsewhere in this list.
simpleimageresizer.com
- Uploads your file
- Unknown — leans toward yes per its own claim. The file input is not inside any <form>, so its submission path is JS-driven. static/js/imageResizerToKb.js (368 lines) and sharedFunctions.js (39KB) were read and grepped: no FormData/multipart, but sharedFunctions.js defines generic fetchPOSTRequest/fetchGETRequest helpers that could carry image data as JSON; the specific call sites were not traced in the time available, so this stays inconclusive from code alone.
- Ads
- The heaviest ad stack in this survey. Google Ad Manager (securepubads.g.doubleclick.net), Prebid.js, Amazon apstag, Criteo, 33across, ID5, a cookie-sync stack (tags.crwdcntrl.net), plus Hotjar and GrowthBook — a full programmatic real-time-bidding stack, not just a banner slot.
- Pricing
- Freemium with a real checkout. A 'Go Premium' upsell and a working Stripe-style one-time-payment form (posts to /create-one-time-payment-checkout-session) confirm a paid ad-free tier alongside the free one.
- What the site itself says
- claim"Images are uploaded securely, never shared with 3rd parties, and deleted permanently once the download link expires (after 24 hours)." — the most specific data-retention claim of any site in this survey, and notably it says "uploaded" outright rather than claiming local processing.
- Where it beats us
- Premium tier raises the batch limit to 25 files processed at once with ads removed, higher than the free batch limits on the other sites here.
Questions people actually ask
- Do jpeg-optimizer.com and image.pi7.org actually process images in the browser, like they claim?
- Yes. Their full compression JavaScript was read line by line and neither one contains a FormData, fetch or XMLHttpRequest call that would send the file anywhere — both build the compressed output with URL.createObjectURL(). That is a genuine match for this site's own approach, and this page does not claim a privacy advantage over either of them because there isn't one.
- So what's actually different about this site's compressor?
- No ad network is loaded on the page at all — this site carries no third-party ad script on the tool page — where the four alternatives here range from one deferred ad placement to a full real-time-bidding stack. The target-size search and the resolution ladder are also documented on the tool page itself, not left as a black box.
- Is this comparison current?
- Measured 2026-08-20 from one session on one machine. Ad stacks and page behaviour change without notice; treat this as a snapshot, not a live monitor.
